CVE-2026-77568
Mojolicious: CSRF tokens are vulnerable to BREACH attacks
CVSS Score
4.2
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-200 CWE-352 |
| Vendor | mojolicious |
| Product | mojo |
| Published | Sep 18, 2026 |
| Last Updated | Sep 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None
Affected Versions
mojolicious / mojo
< 9.48