{"id":"CVE-2026-40896","state":"PUBLISHED","title":"OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup","description":"OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue.","publishedAt":"2026-04-20T15:12:52.279Z","updatedAt":"2026-04-20T16:13:10.714Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["opf openproject"],"affected":[{"vendor":"opf","product":"openproject","versions":[{"version":"< 17.3.0","status":"affected"}]}],"references":["https://github.com/opf/openproject/security/advisories/GHSA-hh5p-gwf8-h245","https://github.com/opf/openproject/commit/8f693a1f35d0a84bb69af78fb6925f74329ae4fe"],"weaknesses":["CWE-367","CWE-639"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/40xxx/CVE-2026-40896.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-40896","state":"PUBLISHED","datePublished":"2026-04-20T15:12:52.279Z","dateUpdated":"2026-04-20T16:13:10.714Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-15T16:37:22.766Z"},"containers":{"cna":{"title":"OpenProject has Cross-Project Meeting Agenda Item Injection via Unscoped Section Lookup","descriptions":[{"lang":"en","value":"OpenProject is open-source, web-based project management software. Prior to version 17.3.0, a user with `manage_agendas` permission in any project can inject agenda items into meetings belonging to any other project on the instance — even projects they have no access to. No knowledge of the target project, meeting, or victim is required; the attacker can blindly spray items into every meeting on the instance by iterating sequential section IDs. Version 17.3.0 patches the issue."}],"affected":[{"vendor":"opf","product":"openproject","versions":[{"version":"< 17.3.0","status":"affected"}]}],"references":[{"url":"https://github.com/opf/openproject/security/advisories/GHSA-hh5p-gwf8-h245","name":"https://github.com/opf/openproject/security/advisories/GHSA-hh5p-gwf8-h245","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/opf/openproject/commit/8f693a1f35d0a84bb69af78fb6925f74329ae4fe","name":"https://github.com/opf/openproject/commit/8f693a1f35d0a84bb69af78fb6925f74329ae4fe","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-367","lang":"en","description":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","type":"CWE"}]},{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-20T15:12:52.279Z"},"source":{"advisory":"GHSA-hh5p-gwf8-h245","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/opf/openproject/security/advisories/GHSA-hh5p-gwf8-h245","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-20T16:13:05.532704Z","id":"CVE-2026-40896","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-20T16:13:10.714Z"}}]}}}