{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-96281","assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","state":"PUBLISHED","assignerShortName":"redhat","dateReserved":"2026-09-22T20:43:45.571Z","datePublished":"2026-09-27T21:00:17.262Z","dateUpdated":"2026-09-27T21:16:34.274Z"},"containers":{"cna":{"title":"Flatpak: flatpak: unprivileged active user can bypass anti-downgrade checks for system apps/runtimes","metrics":[{"other":{"content":{"value":"Moderate","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"PHYSICAL","availabilityImpact":"HIGH","baseScore":6.2,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:P/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H","version":"3.1"},"format":"CVSS"}],"descriptions":[{"lang":"en","value":"On a multi-user system, a user with an active local login session could downgrade a system-wide Flatpak app to an older version by removing the app's remote ref via the unprivileged system-helper RemoveLocalRef method, causing the anti-downgrade check to fail to find a reference date. A malicious local user could use this to expose other users of the same system to an app version with unfixed vulnerabilities."}],"affected":[{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 10","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"flatpak","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:10"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 7","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"flatpak","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:7"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 8","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"flatpak","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:8"]},{"vendor":"Red Hat","product":"Red Hat Enterprise Linux 9","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"flatpak","defaultStatus":"affected","cpes":["cpe:/o:redhat:enterprise_linux:9"]}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-96281","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2539421","name":"RHBZ#2539421","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://github.com/flatpak/flatpak/security/advisories/GHSA-q4gr-vc25-57m5"}],"datePublic":"2026-08-11T00:00:00.000Z","problemTypes":[{"descriptions":[{"cweId":"CWE-284","description":"Improper Access Control","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-284: Improper Access Control","workarounds":[{"lang":"en","value":"Ensure that Flatpak apps installed system-wide are fully updated before running them."}],"timeline":[{"lang":"en","time":"2026-08-11T00:00:00.000Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-08-11T00:00:00.000Z","value":"Made public."}],"credits":[{"lang":"en","value":"Upstream acknowledges Vivek Parikh (BreachX Zero Day Labs) as the original reporter."}],"providerMetadata":{"orgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","shortName":"redhat","dateUpdated":"2026-09-27T21:16:34.274Z"},"x_generator":{"engine":"cvelib 1.8.0"}}}}