CVE-2026-8368: Oalders Lwp::useragent

Medium severity, CVSS 6.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Oalders Lwp::useragent: before 6.83 (fixed in 6.83)

Published 2026-05-12. Last modified 2026-06-17.