CVE-2026-67354
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
Summary
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 Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| guzzle | guzzle | 0 < 7.15.1 | affected |
| guzzle | guzzle | 7.15.1 | unaffected |
Weaknesses
- CWE-201: Insertion of Sensitive Information Into Sent Data
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
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