{"items":[{"id":"NVI-00006361","kind":"vulnerability","title":"Concrete CMS Vulnerable to Deserialization of Untrusted Data","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-pv2v-6w2v-97x6","CVE-2026-8135"],"plain_summary":"OSV carries this publisher advisory for concrete5/concrete5. 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 9.5.1 for concrete5/concrete5. Confirm the publisher’s latest guidance.","source_ids":["sr-b1704c605dd8b038c3413da831684e10"],"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-0fef142b87f4024436fe353a2a16272c"],"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":"EPSS","as_of":"2026-11-03T12:00:27.000Z","value":"0.470%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.4074. Missing scores are unknown.","source_id":"sr-0fef142b87f4024436fe353a2a16272c"}],"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-b1704c605dd8b038c3413da831684e10","url":"https://github.com/advisories/GHSA-pv2v-6w2v-97x6","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-pv2v-6w2v-97x6","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.995Z"},{"id":"sr-0fef142b87f4024436fe353a2a16272c","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-2026-8135","publisher":"FIRST EPSS","observed_at":"2026-11-03T17:45:16.085Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-b1704c605dd8b038c3413da831684e10"],"technology":"concrete5/concrete5","known_exclusions":[],"conditions_summary":"Concrete CMS 9.5.0 and below is vulnerable to Remote Code Execution  due to insecure deserialization occurring in the ExpressEntryList block controller. An rogue administrator with privileges to add blocks to an area can bypass the intended protection mechanism (_fromCIF === true), which normally restricts malicious inputs over form POST requests, by leveraging the REST API functionality. Because the REST API parses requests using json_decode(), the string \"true\" is evaluated as a strict PHP Boolean(true).  This bypass allows the attacker to inject a malicious serialized payload  into the block's filterFields database column. The payload will subsequently be executed when the block's data is viewed or edited by an administrator leading to complete server takeover (RCE). Concrete CMS thanks  Nguyễn Văn Thiện https://github.com/Thien225409  for reporting this issue.","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 9.5.1"]}],"null_published_at":"2026-11-06T00:29:57.281Z","source_updated_at":"2026-09-10T03:50:47.307Z","source_disclosed_at":"2026-05-21T21:30:37.000Z","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":"2026-10-31T21:42:30.995Z"},{"id":"NVI-00006361","kind":"vulnerability","title":"Concrete CMS Vulnerable to Deserialization of Untrusted Data","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-pv2v-6w2v-97x6","CVE-2026-8135"],"plain_summary":"OSV carries this publisher advisory for concrete5/concrete5. 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 9.5.1 for concrete5/concrete5. Confirm the publisher’s latest guidance.","source_ids":["sr-b1704c605dd8b038c3413da831684e10"],"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-33dc35f73ecf321e0ffcb049176727ef"],"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":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.470%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.40711. Missing scores are unknown.","source_id":"sr-33dc35f73ecf321e0ffcb049176727ef"}],"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-b1704c605dd8b038c3413da831684e10","url":"https://github.com/advisories/GHSA-pv2v-6w2v-97x6","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-pv2v-6w2v-97x6","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.995Z"},{"id":"sr-33dc35f73ecf321e0ffcb049176727ef","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-2026-8135","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.385Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-b1704c605dd8b038c3413da831684e10"],"technology":"concrete5/concrete5","known_exclusions":[],"conditions_summary":"Concrete CMS 9.5.0 and below is vulnerable to Remote Code Execution  due to insecure deserialization occurring in the ExpressEntryList block controller. An rogue administrator with privileges to add blocks to an area can bypass the intended protection mechanism (_fromCIF === true), which normally restricts malicious inputs over form POST requests, by leveraging the REST API functionality. Because the REST API parses requests using json_decode(), the string \"true\" is evaluated as a strict PHP Boolean(true).  This bypass allows the attacker to inject a malicious serialized payload  into the block's filterFields database column. The payload will subsequently be executed when the block's data is viewed or edited by an administrator leading to complete server takeover (RCE). Concrete CMS thanks  Nguyễn Văn Thiện https://github.com/Thien225409  for reporting this issue.","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 9.5.1"]}],"null_published_at":"2026-10-31T22:27:15.286Z","source_updated_at":"2026-09-10T03:50:47.307Z","source_disclosed_at":"2026-05-21T21:30:37.000Z","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":"2026-10-31T21:42:30.995Z"},{"id":"NVI-00006361","kind":"vulnerability","title":"Concrete CMS Vulnerable to Deserialization of Untrusted Data","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-pv2v-6w2v-97x6","CVE-2026-8135"],"plain_summary":"OSV carries this publisher advisory for concrete5/concrete5. 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 9.5.1 for concrete5/concrete5. Confirm the publisher’s latest guidance.","source_ids":["sr-b1704c605dd8b038c3413da831684e10"],"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-b1704c605dd8b038c3413da831684e10","url":"https://github.com/advisories/GHSA-pv2v-6w2v-97x6","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-pv2v-6w2v-97x6","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:30.995Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-b1704c605dd8b038c3413da831684e10"],"technology":"concrete5/concrete5","known_exclusions":[],"conditions_summary":"Concrete CMS 9.5.0 and below is vulnerable to Remote Code Execution  due to insecure deserialization occurring in the ExpressEntryList block controller. An rogue administrator with privileges to add blocks to an area can bypass the intended protection mechanism (_fromCIF === true), which normally restricts malicious inputs over form POST requests, by leveraging the REST API functionality. Because the REST API parses requests using json_decode(), the string \"true\" is evaluated as a strict PHP Boolean(true).  This bypass allows the attacker to inject a malicious serialized payload  into the block's filterFields database column. The payload will subsequently be executed when the block's data is viewed or edited by an administrator leading to complete server takeover (RCE). Concrete CMS thanks  Nguyễn Văn Thiện https://github.com/Thien225409  for reporting this issue.","public_affected_ranges":["ECOSYSTEM: introduced 0; fixed 9.5.1"]}],"null_published_at":"2026-10-31T22:13:10.053Z","source_updated_at":"2026-09-10T03:50:47.307Z","source_disclosed_at":"2026-05-21T21:30:37.000Z","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":"2026-10-31T21:42:30.995Z"}],"next_cursor":null,"snapshot_revision":"42594"}