{"items":[{"id":"NVI-00005146","kind":"vulnerability","title":"October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers","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-xhfx-hgmf-v6vp","CVE-2021-21265"],"plain_summary":"OSV carries this publisher advisory for october/backend. 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 1.1.2 for october/backend. Confirm the publisher’s latest guidance.","source_ids":["sr-841f08652629f179a82e297f8e009a84"],"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-498eb08db148c6011c8ad3ab4058462a"],"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":"2026-06-17T03:35:09.290Z","value":"4.3 MEDIUM (2.0)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-76a665b7862253a87d592dd9d4233baa"},{"kind":"CVSS","as_of":"2026-06-17T03:35:09.290Z","value":"6.8 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-76a665b7862253a87d592dd9d4233baa"},{"kind":"CVSS","as_of":"2026-06-17T03:35:09.290Z","value":"7.5 HIGH (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-76a665b7862253a87d592dd9d4233baa"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"1.748%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.77837. Missing scores are unknown.","source_id":"sr-498eb08db148c6011c8ad3ab4058462a"}],"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-841f08652629f179a82e297f8e009a84","url":"https://github.com/advisories/GHSA-xhfx-hgmf-v6vp","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-xhfx-hgmf-v6vp","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:51.445Z"},{"id":"sr-76a665b7862253a87d592dd9d4233baa","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21265","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2021-21265","publisher":"NIST National Vulnerability Database","observed_at":"2026-10-31T22:07:35.928Z"},{"id":"sr-498eb08db148c6011c8ad3ab4058462a","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-2021-21265","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:03.704Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-841f08652629f179a82e297f8e009a84"],"technology":"october/backend","known_exclusions":[],"conditions_summary":"### Impact\nWhen running on servers that are configured to accept a wildcard as a hostname (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. See the following resources for more information on Host Header Poisoning:\n- https://portswigger.net/web-security/host-header\n- https://dzone.com/articles/what-is-a-host-header-attack\n\n### Patches\n\nA feature has been added in v1.1.2 to allow a set of trusted hosts to be specified in the application.\n\n### Workarounds\n\n- Apply https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6 & https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0 to your installation manually if unable to upgrade to v1.1.2.\n\n- Check that the configuration setting `cms.linkPolicy` is set to `force`.\n\n### Alternative Workaround\n\nCheck to make sure that your web server does not accept any hostname when serving your web application.\n\n1. Add an entry called `testing.tld` to your computer's host file and direct it to your server's IP address\n2. Open the address `testing.tld` in your web browser\n3. Make sure ","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 1.1.2"]}],"null_published_at":"2026-10-31T23:18:17.259Z","source_updated_at":"2026-07-08T06:28:47.054Z","source_disclosed_at":"2021-03-10T21:07:25.000Z","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":"2026-10-31T21:42:51.445Z"},{"id":"NVI-00005146","kind":"vulnerability","title":"October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers","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-xhfx-hgmf-v6vp","CVE-2021-21265"],"plain_summary":"OSV carries this publisher advisory for october/backend. 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 1.1.2 for october/backend. Confirm the publisher’s latest guidance.","source_ids":["sr-841f08652629f179a82e297f8e009a84"],"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-76a665b7862253a87d592dd9d4233baa"],"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":"2026-06-17T03:35:09.290Z","value":"4.3 MEDIUM (2.0)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-76a665b7862253a87d592dd9d4233baa"},{"kind":"CVSS","as_of":"2026-06-17T03:35:09.290Z","value":"6.8 MEDIUM (3.1)","meaning":"security-advisories@github.com severity; no combined Null risk score.","source_id":"sr-76a665b7862253a87d592dd9d4233baa"},{"kind":"CVSS","as_of":"2026-06-17T03:35:09.290Z","value":"7.5 HIGH (3.1)","meaning":"nvd@nist.gov severity; no combined Null risk score.","source_id":"sr-76a665b7862253a87d592dd9d4233baa"}],"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-841f08652629f179a82e297f8e009a84","url":"https://github.com/advisories/GHSA-xhfx-hgmf-v6vp","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-xhfx-hgmf-v6vp","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:51.445Z"},{"id":"sr-76a665b7862253a87d592dd9d4233baa","url":"https://nvd.nist.gov/vuln/detail/CVE-2021-21265","basis":"official_catalog","notes":"This product uses data from the NVD API but is not endorsed or certified by the NVD.","title":"CVE-2021-21265","publisher":"NIST National Vulnerability Database","observed_at":"2026-10-31T22:07:35.928Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-841f08652629f179a82e297f8e009a84"],"technology":"october/backend","known_exclusions":[],"conditions_summary":"### Impact\nWhen running on servers that are configured to accept a wildcard as a hostname (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. See the following resources for more information on Host Header Poisoning:\n- https://portswigger.net/web-security/host-header\n- https://dzone.com/articles/what-is-a-host-header-attack\n\n### Patches\n\nA feature has been added in v1.1.2 to allow a set of trusted hosts to be specified in the application.\n\n### Workarounds\n\n- Apply https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6 & https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0 to your installation manually if unable to upgrade to v1.1.2.\n\n- Check that the configuration setting `cms.linkPolicy` is set to `force`.\n\n### Alternative Workaround\n\nCheck to make sure that your web server does not accept any hostname when serving your web application.\n\n1. Add an entry called `testing.tld` to your computer's host file and direct it to your server's IP address\n2. Open the address `testing.tld` in your web browser\n3. Make sure ","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 1.1.2"]}],"null_published_at":"2026-10-31T22:27:06.714Z","source_updated_at":"2026-07-08T06:28:47.054Z","source_disclosed_at":"2021-03-10T21:07:25.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Source facts changed; compare the preserved prior revision.","null_first_observed_at":"2026-10-31T21:42:51.445Z"},{"id":"NVI-00005146","kind":"vulnerability","title":"October CMS vulnerable to Potential Host Header Poisoning on misconfigured servers","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-xhfx-hgmf-v6vp","CVE-2021-21265"],"plain_summary":"OSV carries this publisher advisory for october/backend. 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 1.1.2 for october/backend. Confirm the publisher’s latest guidance.","source_ids":["sr-841f08652629f179a82e297f8e009a84"],"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-841f08652629f179a82e297f8e009a84","url":"https://github.com/advisories/GHSA-xhfx-hgmf-v6vp","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-xhfx-hgmf-v6vp","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:51.445Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-841f08652629f179a82e297f8e009a84"],"technology":"october/backend","known_exclusions":[],"conditions_summary":"### Impact\nWhen running on servers that are configured to accept a wildcard as a hostname (i.e. the server routes any request, regardless of the HOST header to an October CMS instance) the potential exists for Host Header Poisoning attacks to succeed. See the following resources for more information on Host Header Poisoning:\n- https://portswigger.net/web-security/host-header\n- https://dzone.com/articles/what-is-a-host-header-attack\n\n### Patches\n\nA feature has been added in v1.1.2 to allow a set of trusted hosts to be specified in the application.\n\n### Workarounds\n\n- Apply https://github.com/octobercms/library/commit/f86fcbcd066d6f8b939e8fe897409d152b11c3c6 & https://github.com/octobercms/october/commit/f638d3f78cfe91d7f6658820f9d5e424306a3db0 to your installation manually if unable to upgrade to v1.1.2.\n\n- Check that the configuration setting `cms.linkPolicy` is set to `force`.\n\n### Alternative Workaround\n\nCheck to make sure that your web server does not accept any hostname when serving your web application.\n\n1. Add an entry called `testing.tld` to your computer's host file and direct it to your server's IP address\n2. Open the address `testing.tld` in your web browser\n3. Make sure ","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 1.1.2"]}],"null_published_at":"2026-10-31T22:13:01.451Z","source_updated_at":"2026-07-08T06:28:47.054Z","source_disclosed_at":"2021-03-10T21:07:25.000Z","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":"2026-10-31T21:42:51.445Z"}],"next_cursor":null,"snapshot_revision":"42594"}