CVE-2026-84461— Zammad: Missing rate limiting allows password brute-forcing during two-factor login
Quick assessment
Affected
zammad zammad
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Zammad 是一款基于 Web 的开源帮助台/客户支持系统。在 7.1.2 版本之前，其双因素登录机制存在安全漏洞：攻击者可以对任意账户无限次尝试密码猜测，而不会触发 Zammad 正常的账户锁定或速率限制机制。此外，系统在验证双因素认证之前，就会返回响应，泄露密码猜测是否正确的信息。这使得攻击者能够对弱密码或重用密码进行暴力破解。该问题已在 7.1.2 版本中修复。
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I. Basic Information for CVE-2026-84461
Vulnerability Information
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Vulnerability Title
Zammad: Missing rate limiting allows password brute-forcing during two-factor login
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
通过差异性导致的信息暴露
Source: CVE Program / CVE List V5
Affected Products
II. Public POCs for CVE-2026-84461
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Other References for CVE-2026-84461 (2)
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https://github.com/zammad/zammad/security/advisories/GHSA-6vh5-pfp2-5rmh x_refsource_CONFIRM
Same Patch Batch · zammad · 2026-09-25 · 30 CVEs total
| CVE-2026-84458 | 9.1 CRITICAL | Zammad: Account takeover via unverified email matching during SSO auto-link |
| CVE-2026-61525 | 8.8 HIGH | Zammad: Arbitrary File Deletion via Unvalidated Session Identifier in Long Polling Control |
| CVE-2026-56733 | 8.7 HIGH | Zammad: Incorrect Authorization and Improper Privilege Management |
| CVE-2026-56725 | 8.7 HIGH | Zammad: Denial of Service via OTRS Import Controller |
| CVE-2026-84462 | 8.6 HIGH | Zammad: AI Agent template sanitizer bypass leads to remote code execution |
| CVE-2026-56731 | 8.4 HIGH | Zammad: Cross-Site Scripting in Ticket Notifications |
| CVE-2026-56724 | 7.1 HIGH | Zammad: Incorrect implementation of permission checks in the knowledge base module |
| CVE-2026-84465 | 7.1 HIGH | Zammad: S/MIME signature verification allows forged sender impersonation |
| CVE-2026-84464 | 7.1 HIGH | Zammad: IDOR in External Data Source rendering exposes ticket, user, group, and organizati |
| CVE-2026-56727 | 7.1 HIGH | Zammad: PGP signature spoofing via unvalidated verification return |
| CVE-2026-56723 | 7.1 HIGH | Zammad: Missing authorization on ticket attachment download |
| CVE-2026-63207 | 6.9 MEDIUM | Zammad: Sensitive Information Exposure in Integration Administration API |
| CVE-2026-84463 | 6.3 MEDIUM | Zammad: Stored HTML injection in Knowledge Base video widget enables forced session switch |
| CVE-2026-56735 | 5.3 MEDIUM | Zammad: Improper neutralization of `srcset` attribute in IMG tags in Zammad |
| CVE-2026-56728 | 5.3 MEDIUM | Zammad: Cross-User Taskbar Item Access Control Vulnerability |
| CVE-2026-56732 | 5.3 MEDIUM | Zammad: Malicious input in Ticket Body Enables Session Termination |
| CVE-2026-56734 | 5.3 MEDIUM | Zammad: Avatar Image URL Server-Side Request Forwarding |
| CVE-2026-84460 | 5.3 MEDIUM | Zammad: Missing Authorization in TagsController#list Allows Cross-Object Tag Enumeration |
| CVE-2026-63206 | 5.3 MEDIUM | Zammad: Remote image tracking bypass via shortened URL scheme |
| CVE-2026-61855 | 5.3 MEDIUM | Zammad: Invalid PGP Detached Signatures Reported as Good Signature on Inbound Mail |
Showing top 20 of 30 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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Same vendor: zammad
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CVE-2026-63208
Zammad: Microsoft Graph error logs expose partially masked O -
CVE-2026-63006
Zammad: HTML sanitizer API path allowlist bypass via interio -
CVE-2026-63204
Zammad: Authenticated agents can read AI summary error messa -
CVE-2026-61855
Zammad: Invalid PGP Detached Signatures Reported as Good Sig -
CVE-2026-63207
Zammad: Sensitive Information Exposure in Integration Admini
V. Comments for CVE-2026-84461
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