CVE-2026-84461 Zammad: Missing rate limiting allows password brute-forcing during two-factor login
Attackers can brute-force passwords during two-factor login due to missing rate limiting, potentially taking over accounts.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84461?
CVE-2026-84461 is a medium-severity missing authorization vulnerability in zammad, published on 25 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
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.
Which versions are affected by CVE-2026-84461?
How do I fix CVE-2026-84461?
No fix has been published for CVE-2026-84461 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-84461 being exploited?
There is no known exploitation of CVE-2026-84461 in the wild and no public exploit code.
Sources
Also known as GHSA-6vh5-pfp2-5rmh.