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CVE-2026-67354 is an information disclosure vulnerability in guzzlehttp/guzzle versions prior to 7.15.1. The flaw is in RedirectMiddleware when processing redirects with the optional allow_redirects.referer setting enabled. During same-scheme redirects, such as HTTPS-to-HTTPS, the middleware generates a Referer header for the follow-up request and incorrectly includes the URI fragment from the original request. Because URI fragments can contain sensitive client-side values such as one-time login secrets, access tokens, or state parameters, a redirect target controlled by an attacker can receive data that should never be transmitted in HTTP headers. Version 7.15.1 corrects this behavior by stripping the fragment before constructing the Referer header.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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