{"items":[{"id":"NVI-00006082","kind":"vulnerability","title":"Moodle Session Fixation allows unauthenticated users to hijack sessions via sesskey parameter","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-cgvv-3455-824j","CVE-2025-53021"],"plain_summary":"OSV carries this publisher advisory for moodle/moodle. 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 4.0.0 for moodle/moodle. Confirm the publisher’s latest guidance.","source_ids":["sr-a6d051af29a14b5001e8f1e3ccf4fd55"],"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-02e8fdc8a0d529dcc6ac89da7f21e257"],"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":"2026-11-06T12:00:23.000Z","value":"0.370%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.3102. Missing scores are unknown.","source_id":"sr-02e8fdc8a0d529dcc6ac89da7f21e257"}],"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-a6d051af29a14b5001e8f1e3ccf4fd55","url":"https://github.com/advisories/GHSA-cgvv-3455-824j","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-cgvv-3455-824j","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:10.700Z"},{"id":"sr-02e8fdc8a0d529dcc6ac89da7f21e257","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-2025-53021","publisher":"FIRST EPSS","observed_at":"2026-11-06T20:58:43.508Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-a6d051af29a14b5001e8f1e3ccf4fd55"],"technology":"moodle/moodle","known_exclusions":[],"conditions_summary":"A session fixation vulnerability in Moodle 3.x through 3.11.18 allows unauthenticated attackers to hijack user sessions via the sesskey parameter. The sesskey can be obtained without authentication and reused within the OAuth2 login flow, resulting in the victim's session being linked to the attacker's. Successful exploitation results in full account takeover. According to the Moodle Releases page, \"Bug fixes for security issues in 3.11.x ended 11 December 2023.\" NOTE: This vulnerability only affects products that are no longer supported by the maintainer.","public_affected_ranges":["ECOSYSTEM: introduced 3.0.0; fixed 4.0.0"]}],"null_published_at":"2026-11-07T22:29:26.087Z","source_updated_at":"2025-07-10T06:27:06.869Z","source_disclosed_at":"2025-06-24T21:30:29.000Z","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":"2026-10-31T21:42:10.700Z"},{"id":"NVI-00006082","kind":"vulnerability","title":"Moodle Session Fixation allows unauthenticated users to hijack sessions via sesskey parameter","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-cgvv-3455-824j","CVE-2025-53021"],"plain_summary":"OSV carries this publisher advisory for moodle/moodle. 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 4.0.0 for moodle/moodle. Confirm the publisher’s latest guidance.","source_ids":["sr-a6d051af29a14b5001e8f1e3ccf4fd55"],"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-7f35d942d4d14fcdc90c5d00499131d8"],"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":"0.370%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.3089. Missing scores are unknown.","source_id":"sr-7f35d942d4d14fcdc90c5d00499131d8"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. 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Dataset date/model retained; FIRST services terms apply.","title":"CVE-2025-53021","publisher":"FIRST EPSS","observed_at":"2026-10-31T22:06:15.372Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-a6d051af29a14b5001e8f1e3ccf4fd55"],"technology":"moodle/moodle","known_exclusions":[],"conditions_summary":"A session fixation vulnerability in Moodle 3.x through 3.11.18 allows unauthenticated attackers to hijack user sessions via the sesskey parameter. The sesskey can be obtained without authentication and reused within the OAuth2 login flow, resulting in the victim's session being linked to the attacker's. Successful exploitation results in full account takeover. 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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 4.0.0 for moodle/moodle. Confirm the publisher’s latest guidance.","source_ids":["sr-a6d051af29a14b5001e8f1e3ccf4fd55"],"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-a6d051af29a14b5001e8f1e3ccf4fd55","url":"https://github.com/advisories/GHSA-cgvv-3455-824j","basis":"vendor_advisory","notes":"GitHub-origin advisory, CC-BY-4.0; OSV is an aggregate copy, not independent corroboration.","title":"GHSA-cgvv-3455-824j","publisher":"GitHub Advisory Database via OSV","observed_at":"2026-10-31T21:42:10.700Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-a6d051af29a14b5001e8f1e3ccf4fd55"],"technology":"moodle/moodle","known_exclusions":[],"conditions_summary":"A session fixation vulnerability in Moodle 3.x through 3.11.18 allows unauthenticated attackers to hijack user sessions via the sesskey parameter. The sesskey can be obtained without authentication and reused within the OAuth2 login flow, resulting in the victim's session being linked to the attacker's. Successful exploitation results in full account takeover. 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