CVE-2026-15747

Summary

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.

Affected Software

VendorProductVersion RangeStatus
SRIMojolicious4.59 < 9.48affected

Weaknesses

  • CWE-204: CWE-204 Observable Response Discrepancy
  • CWE-352: CWE-352 Cross-Site Request Forgery (CSRF)

ADP Enrichment

CVE Program Container

Additional References

References