---
id: CVE-2026-13576
title: >-
  CallBackery versions before 0.62.0 for Perl store user passwords as unsalted
  HMAC-SHA1 hashes
summary: >-
  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 eq…
severity: none
cwe:
  - CWE-916
  - CWE-759
product: CallBackery
affected:
  - CallBackery < 0.62.0
published: '2026-10-30'
updated: '2026-10-30'
sourceUpdated: '2026-10-30T13:09:47.702Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-13576'
references:
  - url: 'https://metacpan.org/release/OETIKER/CallBackery-0.62.0/changes'
tags:
  - cve.org
epss: 0.00104
epssPercentile: 0.01041
ingestedAt: '2026-11-05T16:07:30.229Z'
---

## Overview

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.

## Affected

- `CallBackery < 0.62.0`

## Remediation

Upgrade to CallBackery 0.62.0 or later.