VDB
CVE-2026-15747
CVE-2026-15747
PUBLISHED
CVSS 9.1 CRITICAL
Reported by CPANSec · Published July 14, 2026
Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle. _csrf_token generates and caches one token per session and returns the same value on every call, and _csrf_field places that value in a hidden `csrf_token` input. When a response carrying the token also echoes attacker-controlled input and is gzip-compressed, the chosen values and the resulting compressed lengths form a BREACH oracle. An attacker able to query it can recover the token and pass csrf_protect validation.
Risk Scores
CVSS 3.1
9.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| SRI | Mojolicious | 4.59 |
| SRI | Mojolicious | 4.59, 4.59 |
Timeline
- Jul 14, 2026 CVE Published
- Jul 15, 2026 Coalition ESS Score
- Jul 15, 2026 CVE Updated
- Aug 7, 2026 EPSS Score
References
- patch
- release-notes
- http://www.openwall.com/lists/oss-security/2026/07/14/16 url