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CVE-2026-91766 is an information-disclosure vulnerability in PHP's http:// stream wrapper. When following redirects, affected versions forwarded Authorization, Cookie, and Proxy-Authorization request headers to the redirect destination without ensuring that it shared the original request's origin. This could disclose sensitive credentials or session material to a different, potentially attacker-controlled host. Fixed releases compare the scheme, host, and port of redirect targets and strip sensitive headers on cross-origin redirects; once stripped, the headers remain removed for subsequent redirect hops.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
14 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability referenced by a Debian Linux 13.0 security update affecting PHP 8.4 packages.
A credential-disclosure vulnerability in PHP's HTTP stream wrapper: sensitive Authorization, Cookie, and Proxy-Authorization headers could be forwarded to an arbitrary redirect destination, leaking credentials across origins.
A network-accessible, low-complexity vulnerability with no required privileges or user interaction, rated CVSS v3.0 critical based on impacts to confidentiality, integrity, and availability. The content associates it with Debian Linux 12.0, 13.0, and 14.0, including php8.2 and php8.4 packages.
A vulnerability addressed by the referenced Slackware PHP security advisory; technical vulnerability details are not provided.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.