{"id":"CVE-2025-71278","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-71278","generatedAt":"2026-10-28T08:36:46.267Z","title":"XenForo before 2.3.5 allows OAuth2 client applications to request unauthorized scopes.","description":"XenForo before 2.3.5 allows OAuth2 client applications to request unauthorized scopes. This affects any customer using OAuth2 clients on any version of XenForo 2.3 prior to 2.3.5, potentially allowing client applications to gain access beyond their intended authorization level.","published":"2026-04-01T01:16:40.000Z","lastModified":"2026-06-17T10:04:00.000Z","status":"Analyzed","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":8.7,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/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-863"],"affected":["xenforo/xenforo"],"epss":{"score":0.00265,"percentile":0.18355,"date":"2026-10-27","history":[]},"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 (0.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://www.vulncheck.com/advisories/xenforo-oauth2-unauthorized-scope-request","tags":["Third Party Advisory"],"source":"disclosure@vulncheck.com"},{"url":"https://xenforo.com/community/threads/xenforo-2-3-5-includes-security-fix-add-ons-released.228812/","tags":["Release Notes"],"source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-71278","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."}