Vulnerability · Published Sep 25, 2026 · Assigned by GitHub_M

CVE-2026-84461Zammad: Missing rate limiting allows password brute-forcing during two-factor login

Medium 6.9

In plain English

A medium-severity security flaw in zammad from zammad. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.3%top 74.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
zammad	zammad	< 7.1.2

Weakness: CWE-203, CWE-307, CWE-799 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/zammad/zammad/security/advisories/GHSA-6vh5-pfp2-5rmh x_refsource_CONFIRM
https://github.com/zammad/zammad/commit/d51254f1c6da13f6ee27636a5c82e53f7e59666b x_refsource_MISC