{"id":"CVE-2026-107850","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-107850","generatedAt":"2026-10-28T02:24:53.031Z","title":"Contao is an Open Source CMS.","description":"Contao is an Open Source CMS. From version 5.7.1 until 5.7.12, core-bundle/config/services.yaml registers the preview access voter as Contao\\CoreBundle\\Security\\Voter\\DataContainer\\PreviewAccessVoter although the shipped class is PreviewVoter. Symfony therefore omits voter autoconfiguration and removes the private service, so PreviewVoter::hasAccess() never enforces ownership. A non-admin backend user with the preview_link module can list every tl_preview_link record, obtain signed share URLs created by other users, and use them to view unpublished pages with showUnpublished despite lacking page permission. The advisory does not establish editing or deletion of foreign links. This issue is fixed in version 5.7.12.","published":"2026-10-09T21:17:03.000Z","lastModified":"2026-10-16T17:17:04.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N"},"cwe":["CWE-639","CWE-862"],"affected":[],"epss":{"score":0.00193,"percentile":0.08894,"date":"2026-10-26","history":[{"date":"2026-10-10","score":0.00193,"percentile":0.08254}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-09T21:17:03.000Z","detail":{"score":"4.3","severity":"MEDIUM","publishedAt":"2026-10-09T21:17:02.770Z"},"summary":"New CVE, medium severity (CVSS 4.3)."}],"references":[{"url":"https://github.com/contao/contao/commit/6b483d380a4b2dc61432c4c697e411508f93bf91","source":"security-advisories@github.com"},{"url":"https://github.com/contao/contao/releases/tag/5.7.12","source":"security-advisories@github.com"},{"url":"https://github.com/contao/contao/security/advisories/GHSA-q6wp-fr43-gm9v","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-107850","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}