Is CVE-2026-77568 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-77568?

CVE-2026-77568 has a CVSS v3 severity of MEDIUM (4.2).

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CVE-2026-77568

Description

Mojolicious is a real-time web framework for Perl. Prior to 9.48, the Mojolicious CSRF helpers csrf_field, csrf_token, and csrf_protect reuse an unchanged per-session token in rendered HTML. When response compression is enabled and attacker-influenced content is reflected in the same response, an unauthenticated attacker who can induce many victim requests and observe response sizes can use a BREACH compression side channel to recover the token and forge cross-site requests. API-only deployments that never render the token in HTML are not affected. This issue is fixed in version 9.48.