Vulnerability · Published Oct 30, 2026 · Assigned by CPANSec
CVE-2026-13576CallBackery versions before 0.62.0 for Perl store user passwords as unsalted HMAC-SHA1 hashes
Unrated
In plain English
A security flaw in CallBackery. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
Severity (CVSS )–Not rated
Exploit odds (30 days)0.1%top 99.0% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| CallBackery | 0 – before 0.62.0 |
Weakness: CWE-916, CWE-759