{"schema":"threatline.record/2","record":{"id":"CVE-2026-115351","aliases":["GHSA-xmwc-wjpr-q378"],"summary":"Mistune 3.2.1 before 3.3.0 CSS Injection via Figure Directive figwidth Option","details":"Mistune from 3.2.1 before 3.3.0 contains a CSS injection vulnerability that allows attackers controlling markdown input to inject arbitrary style declarations via the unvalidated figwidth option of the figure directive. Attackers can append declarations like background:url() to the rendered figure style attribute, forcing victim browsers to send requests to attacker servers and leak attribute values.","categories":["Unclassified"],"product":"mistune","vendor":"lepture","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115351","source_modified_at":"2026-10-22T19:13:27.678Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"mistune","vendor":"lepture","versions":[{"version":"3.2.1","status":"affected","versionType":"semver","lessThan":"3.3.0"},{"version":"3.3.0","status":"unaffected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-115351","source_modified_at":"2026-10-22T19:13:27.678Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"mistune","ecosystem":null},"version":"3.3.0","basis":"first unaffected version stated in the CVE record"}],"cvss":5.3,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00221,"percentile":0.11983,"score_date":"2026-10-23"},"published_at":"2026-10-22T19:13:27.678Z","modified_at":"2026-10-22T19:13:27.678Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-115351","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-22T19:13:27.678Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-115351","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/lepture/mistune/security/advisories/GHSA-xmwc-wjpr-q378","tags":["vendor-advisory"]},{"source":"CVE List","url":"https://www.vulncheck.com/advisories/mistune-3.2.1-before-3.3.0-css-injection-via-figure-directive-figwidth-option","tags":["third-party-advisory"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-22T19:13:27.678Z","content_hash":"decdb05f6ea191f8f7fb10bedeb4b7ca57d8dedbf5ceacbef8b7f8a603bfd4f4"}}