{"id":"CVE-2026-55459","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-55459","generatedAt":"2026-10-28T04:15:12.616Z","title":"The Goobi viewer is a web application that allows digitised material to be displayed in a web browser.","description":"The Goobi viewer is a web application that allows digitised material to be displayed in a web browser. From version 25.01 to before version 26.05, AuthenticationEndpoint.verifyOpenIdToken builds its verifier as JWT.require(algorithm).withIssuer(issuer).build() and does not enforce the aud claim during cryptographic validation. The aud check is performed manually afterwards via a single string-equality call, which only handles single-string aud values. In a multi-RP IdP setup, a token whose single-string aud matches the viewer's client ID but was issued for a different relying party passes the check and authenticates the attacker as the token's sub. This issue has been patched in version 26.05.","published":"2026-10-23T15:17:33.000Z","lastModified":"2026-10-23T16:28:32.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":7.4,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N"},"cwe":["CWE-287","CWE-345"],"affected":[],"epss":{"score":0.00205,"percentile":0.10338,"date":"2026-10-27","history":[{"date":"2026-10-24","score":0.00241,"percentile":0.14486}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.21%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-23T15:17:33.000Z","detail":{"score":"7.4","severity":"HIGH","publishedAt":"2026-10-23T15:17:33.207Z"},"summary":"New CVE, high severity (CVSS 7.4)."}],"references":[{"url":"https://github.com/intranda/goobi-viewer-core/commit/73e2ccb63c36392d46f8d21644592efd6cf87933","source":"security-advisories@github.com"},{"url":"https://github.com/intranda/goobi-viewer-core/releases/tag/v26.05","source":"security-advisories@github.com"},{"url":"https://github.com/intranda/goobi-viewer-core/security/advisories/GHSA-7vrv-qh6g-gfx7","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-55459","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."}