Mojolicious versions from 4.59 before 9.48 for Perl expose a stable representation of the session CSRF token to a BREACH compression oracle

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Summary

CVECVE-2026-15747
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 18:17:12 UTC
Updated2026-07-15 20:08:42 UTC
DescriptionMojolicious 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 And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

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

EPSS: 0.002480000 probability, percentile 0.160680000 (date 2026-07-16)

Problem Types: CWE-204 | CWE-352 | CWE-204 CWE-204 Observable Response Discrepancy | CWE-352 CWE-352 Cross-Site Request Forgery (CSRF)

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SRI Mojolicious affected 4.59 9.48 custom Not specified

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/07/14/16 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
metacpan.org/release/SRI/Mojolicious-9.48/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/mojolicious/mojo/commit/01921fbbbbeca2d1397e082d4a647f9b84c24... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2026-07-14T00:00:00.000ZVersion 9.48 released with fix.

Solutions

CNA: Upgrade to Mojolicious 9.48 or later.

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