PT-2026-58293 · Sri · Mojolicious

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-15747

NVD

CVSS v3.1

9.1

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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.

Fix

CSRF

Weakness Enumeration

CWE-204

CWE-352

Related Identifiers

CVE-2026-15747

Affected Products

Mojolicious

References · 4

• https://github.com/mojolicious/mojo/commit/01921fbbbbeca2d1397e082d4a647f9b84c24e27.patch · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-15747 · Security Note
• https://metacpan.org/release/SRI/Mojolicious-9.48/changes · Note
• http://openwall.com/lists/oss-security/2026/07/14/16 · Note