{"id":"CVE-2026-55890","aliases":["GHSA-pmf8-g7c8-7v54"],"url":"https://o3.security/vulnerability/CVE-2026-55890","summary":"Grav: Stored CSS injection via Markdown image ?style=… reaches MediaObjectTrait::style()","details":"Grav is a file-based Web platform. Prior to 2.0.0-rc.9, Grav's incomplete fix for stored XSS through the Markdown media attribute action (CVE-2026-42841) leaves the sibling MediaObjectTrait::style method reachable through the same Markdown excerpt-action pipeline, allowing an editor to save Markdown image style parameters that are written into the rendered img style attribute without sanitization. This issue is fixed in version 2.0.0-rc.9.","published":"2026-07-10T16:17:14.238Z","modified":"2026-08-12T03:51:19.396831184Z","cvss":{"score":4.8,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N"},"epss":{"score":0.00309,"percentile":0.23198,"asOf":"2026-09-01"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"getgrav/grav","fixedVersion":"2.0.0-rc.9"}],"fix":{"url":"https://github.com/getgrav/grav/commit/24fd6cbc438e12310b126d1176e7d7601203a6f2","label":"getgrav/grav@24fd6cb"},"references":[{"type":"WEB","url":"https://github.com/getgrav/grav/releases/tag/2.0.0-rc.9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55890.json"},{"type":"ADVISORY","url":"https://github.com/getgrav/grav/security/advisories/GHSA-pmf8-g7c8-7v54"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55890"},{"type":"FIX","url":"https://github.com/getgrav/grav/commit/24fd6cbc438e12310b126d1176e7d7601203a6f2"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:19.396831184Z"}}