CVE-2026-13576

CallBackery versions before 0.62.0 for Perl store user passwords as unsalted HMAC-SHA1 hashes

Published Oct 30, 2026 CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Description
CallBackery versions before 0.62.0 for Perl store user passwords as unsalted HMAC-SHA1 hashes.

Passwords are hashed with hmac_sha1_sum() from Mojo::Util with no key, a single fast SHA-1 HMAC. There is no salt, so equal passwords give equal hashes, and no work factor slows down guessing.

An attacker who obtains the user table can recover passwords by fast offline guessing.

Remediation

Vendor Solution

Upgrade to CallBackery 0.62.0 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

Type Values Removed Values Added
First Time appeared Perl
Perl callbackery
Vendors & Products Perl
Perl callbackery
Type Values Removed Values Added
Description CallBackery versions before 0.62.0 for Perl store user passwords as unsalted HMAC-SHA1 hashes. Passwords are hashed with hmac_sha1_sum() from Mojo::Util with no key, a single fast SHA-1 HMAC. There is no salt, so equal passwords give equal hashes, and no work factor slows down guessing. An attacker who obtains the user table can recover passwords by fast offline guessing.
Title CallBackery versions before 0.62.0 for Perl store user passwords as unsalted HMAC-SHA1 hashes
Weaknesses CWE-759
CWE-916
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
CPANSec
Published
Updated
Nov 6, 2026, 4:54 PM
Reserved
Jun 28, 2026, 8:49 PM
Status
Deferred
Published
Oct 30, 2026, 1:18 PM
Modified
Nov 6, 2026, 5:17 PM