{"id":"CVE-2026-67354","state":"PUBLISHED","title":"guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer","description":"guzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware. When the optional allow_redirects.referer setting is enabled, the middleware copies the URI fragment (the portion after '#') from the referring request into the generated Referer header when following a same-scheme redirect (e.g., HTTPS to HTTPS). An attacker who controls the redirect destination can read this fragment from the incoming Referer header, potentially disclosing one-time login secrets, access tokens, state values, or other sensitive client data to a server never meant to receive it. The referer setting is disabled by default. Fixed in 7.15.1, which strips the fragment before generating the Referer value.","publishedAt":"2026-08-01T12:22:18.324Z","updatedAt":"2026-10-08T15:24:16.125Z","severity":{"score":8.2,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["guzzle guzzle"],"affected":[{"vendor":"guzzle","product":"guzzle","packageURL":"pkg:composer/guzzlehttp/guzzle","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"7.15.1","versionType":"semver"},{"version":"7.15.1","status":"unaffected","versionType":"semver"}]}],"references":["https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8","https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer"],"weaknesses":["CWE-201"],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/67xxx/CVE-2026-67354.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-67354","state":"PUBLISHED","datePublished":"2026-08-01T12:22:18.324Z","dateUpdated":"2026-10-08T15:24:16.125Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-07-29T13:36:36.278Z"},"containers":{"cna":{"title":"guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer","descriptions":[{"lang":"en","value":"guzzlehttp/guzzle versions before 7.15.1 contain an information disclosure vulnerability in RedirectMiddleware. When the optional allow_redirects.referer setting is enabled, the middleware copies the URI fragment (the portion after '#') from the referring request into the generated Referer header when following a same-scheme redirect (e.g., HTTPS to HTTPS). An attacker who controls the redirect destination can read this fragment from the incoming Referer header, potentially disclosing one-time login secrets, access tokens, state values, or other sensitive client data to a server never meant to receive it. The referer setting is disabled by default. Fixed in 7.15.1, which strips the fragment before generating the Referer value."}],"affected":[{"vendor":"guzzle","product":"guzzle","packageURL":"pkg:composer/guzzlehttp/guzzle","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"7.15.1","versionType":"semver"},{"version":"7.15.1","status":"unaffected","versionType":"semver"}]}],"references":[{"url":"https://github.com/guzzle/guzzle/security/advisories/GHSA-h95v-h523-3mw8","tags":["vendor-advisory"],"name":"GitHub Security Advisory (GHSA-h95v-h523-3mw8)"},{"url":"https://www.vulncheck.com/advisories/guzzlehttp-guzzle-before-uri-fragment-disclosure-via-referer","name":"VulnCheck Advisory: guzzlehttp/guzzle before 7.15.1 URI Fragment Disclosure via Referer","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"HIGH","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.2,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE","baseScore":5.9,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-201","lang":"en","description":"Insertion of Sensitive Information Into Sent Data","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-08T15:24:16.125Z"},"datePublic":"2026-07-18T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:guzzlephp:guzzle:*:*:*:*:*:*:*:*","versionEndExcluding":"7.15.1"}]}]}],"credits":[{"lang":"en","value":"GrahamCampbell","type":"reporter"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-03T18:24:00.578665Z","id":"CVE-2026-67354","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-03T18:24:12.389Z"}}]}}}