CVE-2026-84461

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

State: Published
Severity: 6.9 Medium
Published: Sep 25, 2026
Updated: Sep 25, 2026
Reserved: Sep 1, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	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	GitHub_M

Weaknesses

CWE-203 Observable Discrepancy
CWE-307 Improper Restriction of Excessive Authentication Attempts
CWE-799 Improper Control of Interaction Frequency

Affected Products

Product	Versions
zammadzammad	< 7.1.2Affected

References

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