{"id":"CVE-2026-113659","title":"ApostropheCMS: Client-side Prototype Pollution in apos.http.parseQuery leading to DOM-based XSS against authenticated users","summary":"ApostropheCMS is an open-source Node.js content management system. Prior to 4.33.0, an unauthenticated attacker can send a crafted link whose query string is automatically parsed by apos.http.parseQuery when an authenticated victim loads…","severity":"medium","cvss":6.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cvssSource":"cna","cwe":["CWE-79","CWE-1321"],"vendor":"apostrophecms","product":"apostrophe","affected":["apostrophe < 4.33.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-28T13:59:41.334411Z"},"published":"2026-10-20","updated":"2026-10-28","sourceUpdated":"2026-10-28T13:59:49.929Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-113659","references":[{"url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-m2m5-rw3w-cwmj","label":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-m2m5-rw3w-cwmj"},{"url":"https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce","label":"https://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845ce"},{"url":"https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350","label":"https://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350"},{"url":"https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0","label":"https://github.com/apostrophecms/apostrophe/releases/tag/apostrophe@4.33.0"},{"url":"https://github.com/advisories/GHSA-m2m5-rw3w-cwmj"}],"tags":["cve.org","ghsa","npm"],"epss":0.00345,"epssPercentile":0.27853,"aliases":["GHSA-m2m5-rw3w-cwmj"],"ecosystem":"npm","patched":["apostrophe 4.33.0"],"ingestedAt":"2026-10-20T18:14:37.225Z","slug":"CVE-2026-113659","body":"## Overview\n\nApostropheCMS is an open-source Node.js content management system. Prior to 4.33.0, an unauthenticated attacker can send a crafted link whose query string is automatically parsed by apos.http.parseQuery when an authenticated victim loads a page with the admin bundle. The parser accepts the special __proto__, constructor, and prototype path keys, allowing browser prototype mutation that can reach an unsafe DOM sink and execute script in the victim's session; anonymous visitors do not load the affected admin context. This issue is fixed in version 4.33.0.\n\n## Affected\n\n- `apostrophe < 4.33.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Package advisory (CVE-2026-113659)\n\nAffected packages:\n\n- `apostrophe < 4.33.0`\n\nPatched in:\n\n- `apostrophe 4.33.0`\n\nSource: https://github.com/advisories/GHSA-m2m5-rw3w-cwmj","depth":"sunlit","depthScore":34,"depthScoreParts":{"impact":33.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}