All vulnerabilities
CVE-2026-84461GHSA-6vh5-pfp2-5rmh

Zammad: Missing rate limiting allows password brute-forcing during two-factor login

zammad zammadApplications & CMS
Open in ThreatlineRecord JSON
CVSS
6.9Medium
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.32%Chance of exploitation activity in the next 30 days, higher than 24% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in7.1.2Fixed versionGitHub
Published25 Sep 2026Updated 25 Sep 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

Description

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, the two-factor login step let an attacker try unlimited password guesses for any account without triggering Zammad's normal lockout or rate limiting. The response also revealed whether a guess was correct, even before two-factor authentication was checked. This made it possible to brute-force weak or reused passwords. This issue is fixed in version 7.1.2.

Text from CVE List

Affected versions 2

  • zammadaffected: < 7.1.2CVE List
  • Zammad<= 7.1.1GitHub

References 2