CVE-2026-84461CWE-203CWE-307CWE-799

CVE-2026-84461

published September 25, 2026

CVSS
6.9
EPSS
0%
Percentile
24.2
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
6.9 · NONE
CVSS v4.0
6.9 · 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
EPSS
0.00324 · 24.2th percentile
Weaknesses
CWE-203 · Observable Discrepancy; CWE-307 · Improper Restriction of Excessive Authentication Attempts; CWE-799 · Improper Control of Interaction Frequency
Published
2026-09-25T23:17Z
References (2)
https://github.com/zammad/zammad/commit/d51254f1c6da13f6ee27636a5c82e53f7e59666b · [email protected]https://github.com/zammad/zammad/security/advisories/GHSA-6vh5-pfp2-5rmh · [email protected]
EPSS history
Timeline
  • 27 SEP 03:28Z
    EPSS moved — → 0%
    epss
  • 25 SEP 18:21Z
    Zammad: Missing rate limiting allows password brute-forcing during two-factor login
    cvelistv5