{"id":"CVE-2026-115351","published":"2026-10-22T19:17:40.920","lastModified":"2026-10-22T19:17:41.033","description":"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.","cvssScore":4.7,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N","cwes":["CWE-94"],"vendors":[],"products":[],"references":[{"url":"https://github.com/lepture/mistune/security/advisories/GHSA-xmwc-wjpr-q378","tags":[]},{"url":"https://www.vulncheck.com/advisories/mistune-3.2.1-before-3.3.0-css-injection-via-figure-directive-figwidth-option","tags":[]}],"exploitRefs":[{"url":"https://github.com/lepture/mistune/security/advisories/GHSA-xmwc-wjpr-q378","tags":[]}],"hasPoc":true,"ai":null}