An issue was discovered in Zammad before 6.2.0.
Priority MEDIUM 40CWE-770Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-770.
Summary
An issue was discovered in Zammad before 6.2.0. Due to lack of rate limiting in the "email address verification" feature, an attacker could send many requests for a known address to cause Denial Of Service (generation of many emails, which would also spam the victim).
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00701 53rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:zammad:zammad:6.1.0:-:*:*:*:*:*:* | 6.1.0 | Vulnerable | Zammad GmbH |
| cpe:2.3:a:zammad:zammad:6.1.0:alpha:*:*:*:*:*:* | 6.1.0 alpha | Vulnerable | Zammad GmbH |
| cpe:2.3:a:zammad:zammad:6.2.0:alpha:*:*:*:*:*:* | 6.2.0 alpha | Vulnerable | Zammad GmbH |
- cpe:2.3:a:zammad:zammad:6.1.0:-:*:*:*:*:*:* Versions 6.1.0 Vulnerable ·Zammad GmbH
- cpe:2.3:a:zammad:zammad:6.1.0:alpha:*:*:*:*:*:* Versions 6.1.0 alpha Vulnerable ·Zammad GmbH
- cpe:2.3:a:zammad:zammad:6.2.0:alpha:*:*:*:*:*:* Versions 6.2.0 alpha Vulnerable ·Zammad GmbH
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2023-50455
- 2026-10-03 Alias added: GHSA-278r-xxvf-49rm
References
More Zammad GmbH Zammad vulnerabilities
- TI-2026-65406 Local privilege escalation in Zammad v1.5.0 to v7.2.2 installed via DEB or RPM package KEVCVSS 4.0CRITICAL 9.4
- TI-2026-65405 Undisclosed RCE in Zammad v6.3 and higher KEVCVSS 4.0CRITICAL 9.4
- TI-2024-22252 An issue was discovered in Zammad before 6.3.0. CVSS 3.1CRITICAL 9.1
- TI-2022-23785 A vulnerability in Zammad v5.3.0 allows attackers to execute arbitrary code or escalate… CVSS 3.1CRITICAL 9.8
- TI-2021-18599 An issue was discovered in Zammad before 4.1.1. CVSS 3.1CRITICAL 9.8
- TI-2021-18603 An issue was discovered in Zammad before 4.1.1. CVSS 3.1CRITICAL 9.8
Sources
- CVE-2023-50455 · CVE Program
- CVE-2023-50455 · NVD
- FIRST EPSS
- GHSA-278r-xxvf-49rm · GitHub Advisory Database · CC BY 4.0
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