{"id":"CVE-2026-34959","state":"PUBLISHED","title":"Adminer before 5.5.0 Open Redirect via X-Forwarded-Prefix","description":"Adminer 4.6.0 before 5.5.0 prepends the client-supplied X-Forwarded-Prefix header to $_SERVER[\"REQUEST_URI\"] with no trusted-proxy check and no validation of the prefix value. An attacker can supply an absolute URL (e.g. X-Forwarded-Prefix: https://evil.example) that flows into Location redirect headers, the Set-Cookie path attribute, and self-referential links. This enables an authenticated open redirect after state-changing POSTs, unauthenticated control of the session cookie path attribute, and poisoning of self-referential links; CR/LF cannot be injected, so header splitting/XSS is not possible.","publishedAt":"2026-08-25T01:29:57.683Z","updatedAt":"2026-08-26T14:18:27.241Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["vrana adminer"],"affected":[{"vendor":"vrana","product":"adminer","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"5.5.0","versionType":"semver"},{"version":"5.5.0","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/vrana/adminer/security/advisories/GHSA-8478-xrj3-h9c2","https://www.vulncheck.com/advisories/adminer-before-open-redirect-via-x-forwarded-prefix"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/34xxx/CVE-2026-34959.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-34959","state":"PUBLISHED","datePublished":"2026-08-25T01:29:57.683Z","dateUpdated":"2026-08-26T14:18:27.241Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-03-31T17:58:43.753Z"},"containers":{"cna":{"title":"Adminer before 5.5.0 Open Redirect via X-Forwarded-Prefix","descriptions":[{"lang":"en","value":"Adminer 4.6.0 before 5.5.0 prepends the client-supplied X-Forwarded-Prefix header to $_SERVER[\"REQUEST_URI\"] with no trusted-proxy check and no validation of the prefix value. 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This enables an authenticated open redirect after state-changing POSTs, unauthenticated control of the session cookie path attribute, and poisoning of self-referential links; CR/LF cannot be injected, so header splitting/XSS is not possible."}],"affected":[{"vendor":"vrana","product":"adminer","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"5.5.0","versionType":"semver"},{"version":"5.5.0","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/vrana/adminer/security/advisories/GHSA-8478-xrj3-h9c2","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-8478-xrj3-h9c2)"},{"url":"https://www.vulncheck.com/advisories/adminer-before-open-redirect-via-x-forwarded-prefix","name":"VulnCheck Advisory: Adminer before 5.5.0 Open Redirect via X-Forwarded-Prefix","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"NONE","integrityImpact":"LOW","availabilityImpact":"NONE","baseScore":4.7,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"Improper Input Validation","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-08-25T01:29:57.683Z"},"datePublic":"2026-07-17T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:adminer:adminer:*:*:*:*:*:*:*:*","versionEndExcluding":"5.5.0"}]}]}],"credits":[{"lang":"en","value":"Infinit3i","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/vrana/adminer/security/advisories/GHSA-8478-xrj3-h9c2","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T18:14:56.740919Z","id":"CVE-2026-34959","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-26T14:18:27.241Z"}}]}}}