CVE-2026-8368
MediumCVSS 6.5Exploitation Probability (EPSS)
Low risk18th percentile - higher than 18% of all known CVEs
Summary
In LWP::UserAgent versions before 6.83 for Perl, Authorization and Proxy-Authorization headers leak on cross-origin redirects. On a 3xx response, the redirect handler strips only Host and Cookie, and caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes.
Risk Assessment
A redirect to an attacker-controlled host discloses the caller's credentials to that host, potentially leading to unauthorized access. The risk affects Perl applications using LWP::UserAgent for authenticated requests.
Recommendation
Update LWP::UserAgent to version 6.83 or later. Until updated, avoid passing authentication headers in requests subject to redirects.
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Original NVD description (English source)
LWP::UserAgent versions before 6.83 for Perl leak Authorization and Proxy-Authorization headers on cross-origin redirects. On a 3xx response, the redirect handler strips only Host and Cookie before issuing the follow-up request. Caller-supplied Authorization and Proxy-Authorization headers are sent unchanged to the redirect target, including across scheme, host, or port changes. A redirect to an attacker controlled host therefore discloses the caller's credentials to that host.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS