CVE-2026-13576

High

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductCallbackery

PublishedOct 30, 2026

First seenNov 4, 2026

Weakness typeCWE-916CWE-916 CWE-759CWE-759

How to fix

Update

CallBackery0.62.0 or later

Vendor advisories

metacpan.org/release/OETIKER/CallBackery-0.62.0/changes

Affected products

Product	Affected versions	Fixed in
CallBackery	v < 0.62.0	0.62.0

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