{"items":[{"id":"NVI-00005107","kind":"vulnerability","title":"Remote Code Execution Through Image Uploads in BookStack","revision":4,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-g9rq-x4fj-f5hx","CVE-2020-5256"],"plain_summary":"OSV carries this publisher advisory for ssddanbrown/bookstack. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 0.25.5 for ssddanbrown/bookstack. Confirm the publisher’s latest guidance.","source_ids":["sr-82342758212bfe51c2958b2c1fd6ce25"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-2ea2ba03ee3e8768a0d3215f6e69e427"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-06-17T03:21:08.630Z","value":"9 HIGH (2.0)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-8a69542d6ee969d696a7c919b38a223c"},{"kind":"CVSS","as_of":"2026-06-17T03:21:08.630Z","value":"7.9 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-8a69542d6ee969d696a7c919b38a223c"},{"kind":"CVSS","as_of":"2026-06-17T03:21:08.630Z","value":"8.8 HIGH (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-8a69542d6ee969d696a7c919b38a223c"},{"kind":"EPSS","as_of":"2026-11-01T12:00:16.000Z","value":"1.969%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.804. Missing scores are unknown.","source_id":"sr-2ea2ba03ee3e8768a0d3215f6e69e427"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-82342758212bfe51c2958b2c1fd6ce25","url":"https://github.com/advisories/GHSA-g9rq-x4fj-f5hx","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-g9rq-x4fj-f5hx","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.414Z"},{"id":"sr-8a69542d6ee969d696a7c919b38a223c","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5256","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2020-5256","publisher":"NIST National Vulnerability Database","observed_at":"2026-10-31T22:07:21.349Z"},{"id":"sr-2ea2ba03ee3e8768a0d3215f6e69e427","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2020-5256","publisher":"FIRST EPSS","observed_at":"2026-11-01T14:27:48.610Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-82342758212bfe51c2958b2c1fd6ce25"],"technology":"ssddanbrown/bookstack","known_exclusions":[],"conditions_summary":"### Impact\n\nA user could upload PHP files through image upload functions, which would allow them to execute code on the host system remotely. They would then have the permissions of the PHP process.\n\nThis most impacts scenarios where non-trusted users are given permission to upload images in any area of the application. \n\n### Patches\n\nThe issue was addressed in a series of patches: v0.25.3, v0.25.4 and v0.25.5.\nUsers should upgrade to at least v0.25.5 to avoid this patch but ideally the latest BookStack version as previous versions are un-supported.\n\n### Workarounds\n\nDepending on BookStack version, you could use the local_secure image storage option, or use s3 or a similar compatible service.\n\nPreventing direct execution of any `php` files, apart from the `public/index.php` file, though web-server configuration would also prevent this.\n\n### References\n\nBookStack Beta v0.25.3\nBookStack Beta v0.25.4\n[BookStack Beta v0.25.5](https://github.com/BookStackApp/BookStack/releases/tag/v0.25.","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 0.25.5"]}],"null_published_at":"2026-11-06T15:18:11.484Z","source_updated_at":"2026-07-08T06:29:09.557Z","source_disclosed_at":"2020-03-13T20:21:27.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:20.414Z"},{"id":"NVI-00005107","kind":"vulnerability","title":"Remote Code Execution Through Image Uploads in BookStack","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-g9rq-x4fj-f5hx","CVE-2020-5256"],"plain_summary":"OSV carries this publisher advisory for ssddanbrown/bookstack. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 0.25.5 for ssddanbrown/bookstack. Confirm the publisher’s latest guidance.","source_ids":["sr-82342758212bfe51c2958b2c1fd6ce25"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-7ea82aafdb3da4b56c96ff6c00ad8f8b"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-06-17T03:21:08.630Z","value":"9 HIGH (2.0)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-8a69542d6ee969d696a7c919b38a223c"},{"kind":"CVSS","as_of":"2026-06-17T03:21:08.630Z","value":"7.9 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-8a69542d6ee969d696a7c919b38a223c"},{"kind":"CVSS","as_of":"2026-06-17T03:21:08.630Z","value":"8.8 HIGH (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-8a69542d6ee969d696a7c919b38a223c"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"1.969%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.80399. Missing scores are unknown.","source_id":"sr-7ea82aafdb3da4b56c96ff6c00ad8f8b"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-82342758212bfe51c2958b2c1fd6ce25","url":"https://github.com/advisories/GHSA-g9rq-x4fj-f5hx","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-g9rq-x4fj-f5hx","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.414Z"},{"id":"sr-8a69542d6ee969d696a7c919b38a223c","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5256","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2020-5256","publisher":"NIST National Vulnerability Database","observed_at":"2026-10-31T22:07:21.349Z"},{"id":"sr-7ea82aafdb3da4b56c96ff6c00ad8f8b","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2020-5256","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:03.704Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-82342758212bfe51c2958b2c1fd6ce25"],"technology":"ssddanbrown/bookstack","known_exclusions":[],"conditions_summary":"### Impact\n\nA user could upload PHP files through image upload functions, which would allow them to execute code on the host system remotely. They would then have the permissions of the PHP process.\n\nThis most impacts scenarios where non-trusted users are given permission to upload images in any area of the application. \n\n### Patches\n\nThe issue was addressed in a series of patches: v0.25.3, v0.25.4 and v0.25.5.\nUsers should upgrade to at least v0.25.5 to avoid this patch but ideally the latest BookStack version as previous versions are un-supported.\n\n### Workarounds\n\nDepending on BookStack version, you could use the local_secure image storage option, or use s3 or a similar compatible service.\n\nPreventing direct execution of any `php` files, apart from the `public/index.php` file, though web-server configuration would also prevent this.\n\n### References\n\nBookStack Beta v0.25.3\nBookStack Beta v0.25.4\n[BookStack Beta v0.25.5](https://github.com/BookStackApp/BookStack/releases/tag/v0.25.","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 0.25.5"]}],"null_published_at":"2026-11-01T19:14:01.624Z","source_updated_at":"2026-07-08T06:29:09.557Z","source_disclosed_at":"2020-03-13T20:21:27.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-10-31T21:42:20.414Z"},{"id":"NVI-00005107","kind":"vulnerability","title":"Remote Code Execution Through Image Uploads in BookStack","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected.","NVD lastModified does not establish freshness of every associated CPE record."],"lifecycle":"active","identifiers":["GHSA-g9rq-x4fj-f5hx","CVE-2020-5256"],"plain_summary":"OSV carries this publisher advisory for ssddanbrown/bookstack. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 0.25.5 for ssddanbrown/bookstack. Confirm the publisher’s latest guidance.","source_ids":["sr-82342758212bfe51c2958b2c1fd6ce25"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null},{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-8a69542d6ee969d696a7c919b38a223c"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-06-17T03:21:08.630Z","value":"9 HIGH (2.0)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-8a69542d6ee969d696a7c919b38a223c"},{"kind":"CVSS","as_of":"2026-06-17T03:21:08.630Z","value":"7.9 HIGH (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-8a69542d6ee969d696a7c919b38a223c"},{"kind":"CVSS","as_of":"2026-06-17T03:21:08.630Z","value":"8.8 HIGH (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-8a69542d6ee969d696a7c919b38a223c"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-82342758212bfe51c2958b2c1fd6ce25","url":"https://github.com/advisories/GHSA-g9rq-x4fj-f5hx","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-g9rq-x4fj-f5hx","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.414Z"},{"id":"sr-8a69542d6ee969d696a7c919b38a223c","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-5256","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2020-5256","publisher":"NIST National Vulnerability Database","observed_at":"2026-10-31T22:07:21.349Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-82342758212bfe51c2958b2c1fd6ce25"],"technology":"ssddanbrown/bookstack","known_exclusions":[],"conditions_summary":"### Impact\n\nA user could upload PHP files through image upload functions, which would allow them to execute code on the host system remotely. They would then have the permissions of the PHP process.\n\nThis most impacts scenarios where non-trusted users are given permission to upload images in any area of the application. \n\n### Patches\n\nThe issue was addressed in a series of patches: v0.25.3, v0.25.4 and v0.25.5.\nUsers should upgrade to at least v0.25.5 to avoid this patch but ideally the latest BookStack version as previous versions are un-supported.\n\n### Workarounds\n\nDepending on BookStack version, you could use the local_secure image storage option, or use s3 or a similar compatible service.\n\nPreventing direct execution of any `php` files, apart from the `public/index.php` file, though web-server configuration would also prevent this.\n\n### References\n\nBookStack Beta v0.25.3\nBookStack Beta v0.25.4\n[BookStack Beta v0.25.5](https://github.com/BookStackApp/BookStack/releases/tag/v0.25.","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 0.25.5"]}],"null_published_at":"2026-10-31T22:27:06.716Z","source_updated_at":"2026-07-08T06:29:09.557Z","source_disclosed_at":"2020-03-13T20:21:27.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:42:20.414Z"},{"id":"NVI-00005107","kind":"vulnerability","title":"Remote Code Execution Through Image Uploads in BookStack","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-g9rq-x4fj-f5hx","CVE-2020-5256"],"plain_summary":"OSV carries this publisher advisory for ssddanbrown/bookstack. This is an aggregated source copy; consult the original publisher and compare update dates.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"The original advisory lists fixed boundaries 0.25.5 for ssddanbrown/bookstack. Confirm the publisher’s latest guidance.","source_ids":["sr-82342758212bfe51c2958b2c1fd6ce25"],"action_type":"vendor_patch","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-82342758212bfe51c2958b2c1fd6ce25","url":"https://github.com/advisories/GHSA-g9rq-x4fj-f5hx","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-g9rq-x4fj-f5hx","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:20.414Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-82342758212bfe51c2958b2c1fd6ce25"],"technology":"ssddanbrown/bookstack","known_exclusions":[],"conditions_summary":"### Impact\n\nA user could upload PHP files through image upload functions, which would allow them to execute code on the host system remotely. They would then have the permissions of the PHP process.\n\nThis most impacts scenarios where non-trusted users are given permission to upload images in any area of the application. \n\n### Patches\n\nThe issue was addressed in a series of patches: v0.25.3, v0.25.4 and v0.25.5.\nUsers should upgrade to at least v0.25.5 to avoid this patch but ideally the latest BookStack version as previous versions are un-supported.\n\n### Workarounds\n\nDepending on BookStack version, you could use the local_secure image storage option, or use s3 or a similar compatible service.\n\nPreventing direct execution of any `php` files, apart from the `public/index.php` file, though web-server configuration would also prevent this.\n\n### References\n\nBookStack Beta v0.25.3\nBookStack Beta v0.25.4\n[BookStack Beta v0.25.5](https://github.com/BookStackApp/BookStack/releases/tag/v0.25.","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 0.25.5"]}],"null_published_at":"2026-10-31T22:13:01.441Z","source_updated_at":"2026-07-08T06:29:09.557Z","source_disclosed_at":"2020-03-13T20:21:27.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-10-31T21:42:20.414Z"}],"next_cursor":null,"snapshot_revision":"42594"}