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CVE

CVE-2026-15747

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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CVE

CVE-2026-15747

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

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

csrftoken generates and caches one token per session and returns the same value on every call, and csrffield 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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
C
H
U
-

Related Resources

No items found.

References

http://www.openwall.com/lists/oss-security/2026/07/14/16, https://cpan.org/modules, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15747.json, https://metacpan.org/release/SRI/Mojolicious-9.48/changes, https://nvd.nist.gov/vuln/detail/CVE-2026-15747, https://github.com/mojolicious/mojo/commit/01921fbbbbeca2d1397e082d4a647f9b84c24e27.patch, https://github.com/mojolicious/mojo

Severity

9.1

CVSS Score
0
10

Basic Information

Base CVSS
9.1
EPSS Probability
0.00255%
EPSS Percentile
0.16831%
Introduced Version
9ca2244a5bc2bac45e8c61db5adffcb65fe0aa0f,0
Fix Available
01921fbbbbeca2d1397e082d4a647f9b84c24e27

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