{"action":"Upgrade flarum/core to 1.8.16 or later.","affected":[{"fixed":"1.8.16","introduced":"0"},{"fixed":"2.0.0-rc.1","introduced":"2.0.0-beta.1"}],"component":"flarum/core","cve_ids":["CVE-2026-41887"],"ecosystem":"Packagist","epss":0.00472,"exploited":false,"fixed_versions":["1.8.16","2.0.0-rc.1"],"ghsa_id":"GHSA-xjvc-pw2r-6878","id":"tcs_01M5KFB4Q1P7XQRK4Y0M3ECWZY","modified_at":"2026-05-13T13:55:21.933564Z","published_at":"2026-04-22T20:34:52Z","references":["https://osv.dev/vulnerability/GHSA-xjvc-pw2r-6878","https://github.com/flarum/framework/security/advisories/GHSA-vhm8-wwrf-3gcw","https://github.com/flarum/framework/security/advisories/GHSA-xjvc-pw2r-6878","https://nvd.nist.gov/vuln/detail/CVE-2023-27577","https://nvd.nist.gov/vuln/detail/CVE-2026-41887","https://github.com/flarum/framework/commit/2d90a1f19f0e46f8c7e1b07c48ba74b5e38f8410","https://github.com/flarum/framework","https://github.com/flarum/framework/releases/tag/v1.8.16","https://github.com/flarum/framework/releases/tag/v2.0.0-rc.1"],"severity":{"label":"medium","score":4.9},"sources":[{"source":"osv","source_id":"GHSA-xjvc-pw2r-6878","url":"https://osv.dev/vulnerability/GHSA-xjvc-pw2r-6878"}],"summary":"Flarum: Path traversal in LESS parser via theme color settings (incomplete fix for CVE-2023-27577)"}