CVEvulnerability

CVE-2026-15747

9.1 CRITICAL Published 2026-07-14 Modified 2026-10-24 Official page ↗
Status
Deferred
Published
2026-07-14
Last modified
2026-10-24
Assigner
9b29abf9-4ab0-4765-b253-1875cd9b441e
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weaknesses
CWE-204, CWE-352

Description

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.

Related

Weakness · CWE (2)

  • CWE-204 Observable Response Discrepancy weakness
  • CWE-352 Cross-Site Request Forgery weakness

References