Mojolicious: CSRF tokens are vulnerable to BREACH attacks

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-77568
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 16:17:09 UTC
Updated2026-09-18 18:17:15 UTC
DescriptionMojolicious 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.

Risk And Classification

Primary CVSS: v3.1 4.2 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

EPSS: 0.000980000 probability, percentile 0.008770000 (date 2026-09-19)

Problem Types: CWE-200 | CWE-352 | CWE-200 CWE-200: Exposure of Sensitive Information to an Unauthorized Actor | CWE-352 CWE-352: Cross-Site Request Forgery (CSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
3.1CNADECLARED4.2MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Mojolicious Mojo affected < 9.48 Not specified

References

ReferenceSourceLinkTags
github.com/mojolicious/mojo/commit/01921fbbbbeca2d1397e082d4a647f9b84c24e27 [email protected] github.com
github.com/mojolicious/mojo/security/advisories/GHSA-cf46-h6jw-mj3r [email protected] github.com
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