{"id":"CVE-2026-107848","state":"PUBLISHED","title":"Contao: Cross-site request forgery in custom backend actions","description":"Contao is an Open Source CMS. From version 4.0.0 until 5.3.50 and 5.7.12, RequestTokenListener validates REQUEST_TOKEN only for POST requests, while the declarative GET guard runs only when an act parameter is present. Backend actions dispatched through the key parameter can therefore execute without a CSRF token when an authenticated backend user loads an attacker-controlled URL. Reachable actions remain limited to modules available to that user, and the advisory demonstrates destructive or state-changing actions rather than privilege escalation. This issue is fixed in versions 5.3.50 and 5.7.12.","publishedAt":"2026-10-09T20:22:12.778Z","updatedAt":"2026-10-13T11:20:32.388Z","severity":{"score":3.5,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["contao contao"],"affected":[{"vendor":"contao","product":"contao","versions":[{"version":">= 4.0.0, < 5.3.50","status":"affected"},{"version":">= 5.4.0-RC1, < 5.7.12","status":"affected"}]}],"references":["https://github.com/contao/contao/security/advisories/GHSA-9ff2-p842-45wq","https://github.com/contao/contao/commit/34dd27ee6739f10568d3d95d8784862255c925b4","https://github.com/contao/contao/releases/tag/5.7.12"],"weaknesses":["CWE-352"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/107xxx/CVE-2026-107848.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-107848","state":"PUBLISHED","datePublished":"2026-10-09T20:22:12.778Z","dateUpdated":"2026-10-13T11:20:32.388Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-10-08T22:34:49.291Z"},"containers":{"cna":{"title":"Contao: Cross-site request forgery in custom backend actions","descriptions":[{"lang":"en","value":"Contao is an Open Source CMS. From version 4.0.0 until 5.3.50 and 5.7.12, RequestTokenListener validates REQUEST_TOKEN only for POST requests, while the declarative GET guard runs only when an act parameter is present. Backend actions dispatched through the key parameter can therefore execute without a CSRF token when an authenticated backend user loads an attacker-controlled URL. Reachable actions remain limited to modules available to that user, and the advisory demonstrates destructive or state-changing actions rather than privilege escalation. This issue is fixed in versions 5.3.50 and 5.7.12."}],"affected":[{"vendor":"contao","product":"contao","versions":[{"version":">= 4.0.0, < 5.3.50","status":"affected"},{"version":">= 5.4.0-RC1, < 5.7.12","status":"affected"}]}],"references":[{"url":"https://github.com/contao/contao/security/advisories/GHSA-9ff2-p842-45wq","name":"https://github.com/contao/contao/security/advisories/GHSA-9ff2-p842-45wq","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/contao/contao/commit/34dd27ee6739f10568d3d95d8784862255c925b4","name":"https://github.com/contao/contao/commit/34dd27ee6739f10568d3d95d8784862255c925b4","tags":["x_refsource_MISC"]},{"url":"https://github.com/contao/contao/releases/tag/5.7.12","name":"https://github.com/contao/contao/releases/tag/5.7.12","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":3.5,"baseSeverity":"LOW","confidentialityImpact":"NONE","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-352","lang":"en","description":"CWE-352: Cross-Site Request Forgery (CSRF)","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-09T20:22:12.778Z"},"source":{"advisory":"GHSA-9ff2-p842-45wq","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-13T11:20:04.775608Z","id":"CVE-2026-107848","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-13T11:20:32.388Z"}}]}}}