{"id":"CVE-2026-104871","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-104871","generatedAt":"2026-10-28T00:57:02.352Z","title":"Prior to versions 20.3.36, 21.2.23, and 22.1.7, the CommonEngine retrieveSSGPage prerendered-page retrieval logic in @angular/ssr/node, and in @angular/ssr for versions 17 through 18, accepts a relative request URL containing a backslash…","description":"The Angular SSR is a server-rise rendering tool for Angular applications. Prior to versions 20.3.36, 21.2.23, and 22.1.7, the CommonEngine retrieveSSGPage prerendered-page retrieval logic in @angular/ssr/node, and in @angular/ssr for versions 17 through 18, accepts a relative request URL containing a backslash parent-traversal segment on Windows. The non-special resolve:// URL base preserves the backslash, path.join interprets it as a Windows separator, and the pagePath.startsWith(normalize(publicPath)) check incorrectly accepts a sibling output directory whose name shares the configured public-directory prefix. An unauthenticated requester can therefore retrieve a sibling prerendered HTML page when that page contains the Angular SSG marker. The issue is limited to Windows deployments that pass relative request URLs to CommonEngine.render, have a prefix-sharing sibling output directory, and contain qualifying prerendered Angular HTML; it does not provide arbitrary file read. This issue is fixed in versions 20.3.36, 21.2.23, and 22.1.7.","published":"2026-10-02T20:17:01.000Z","lastModified":"2026-10-06T16:00:37.000Z","status":"Awaiting Analysis","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"4.0","score":6.3,"severity":"MEDIUM","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M"},"cwe":["CWE-22"],"affected":[],"epss":{"score":0.00421,"percentile":0.36209,"date":"2026-10-26","history":[{"date":"2026-10-03","score":0.0042,"percentile":0.34036}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.42%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-02T20:17:01.000Z","detail":{"score":"6.3","severity":"MEDIUM","publishedAt":"2026-10-02T20:17:00.910Z"},"summary":"New CVE, medium severity (CVSS 6.3)."}],"references":[{"url":"https://github.com/angular/angular-cli/commit/645e41a47d21b7651837a4250de99af0509626e2","source":"security-advisories@github.com"},{"url":"https://github.com/angular/angular-cli/commit/70748ca8e76fe4b42798719410336119d943e755","source":"security-advisories@github.com"},{"url":"https://github.com/angular/angular-cli/commit/bb72145f9ab45aee29f523236b3a25cd0813a841","source":"security-advisories@github.com"},{"url":"https://github.com/angular/angular-cli/commit/c3e5982e49705f0f6a913cb94622b4c555d2d914","source":"security-advisories@github.com"},{"url":"https://github.com/angular/angular-cli/releases/tag/v20.3.36","source":"security-advisories@github.com"},{"url":"https://github.com/angular/angular-cli/releases/tag/v21.2.23","source":"security-advisories@github.com"},{"url":"https://github.com/angular/angular-cli/releases/tag/v22.1.7","source":"security-advisories@github.com"},{"url":"https://github.com/angular/angular-cli/security/advisories/GHSA-7g7c-h8rr-7p6q","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-104871","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}