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Zammad CVE-2026-34723

| EUVDEUVD-2026-20563 HIGH
Improper Access Control (CWE-284)
2026-04-08 GitHub_M
Authentication Bypass Zammad
8.7
CVSS 4.0 · GitHub Advisory
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Severity by source

GitHub Advisory PRIMARY
8.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

7
Re-analysis Queued
Apr 17, 2026 - 15:22 vuln.today
cvss_changed
Analysis Updated
Apr 16, 2026 - 06:01 EUVD-patch-fix
executive_summary
Re-analysis Queued
Apr 16, 2026 - 05:29 backfill_euvd_patch
patch_released
Patch available
Apr 16, 2026 - 05:29 EUVD
6.5.4,7.0.1
EUVD ID Assigned
Apr 08, 2026 - 19:31 euvd
EUVD-2026-20563
Analysis Generated
Apr 08, 2026 - 19:31 vuln.today
CVE Published
Apr 08, 2026 - 18:14 nvd
HIGH 8.7

DescriptionGitHub Advisory

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.1 and 6.5.4, unauthenticated remote attackers were able to access the getting started endpoint to get access to sensitive internal entity data, even after the system setup was completed. This vulnerability is fixed in 7.0.1 and 6.5.4.

AnalysisAI

Unauthenticated remote information disclosure in Zammad helpdesk system versions before 7.0.1 and 6.5.4 allows attackers to access sensitive internal entity data through exposed getting started endpoint. The vulnerability bypasses authentication controls, enabling unauthorized access to confidential system information post-setup. Attack vector is network-based with low complexity requiring no user interaction. No public exploit identified at time of analysis. CVSS 8.7 reflects high confidentiality impact.

Technical ContextAI

Root cause involves improper access control (CWE-284) on setup/initialization endpoint that fails to enforce authentication after system configuration completes. Getting started workflow endpoint remains accessible without credentials, exposing internal data structures and entity information that should be restricted to authenticated administrators post-deployment.

RemediationAI

Vendor-released patch: Zammad 7.0.1 (for 7.x deployments) and 6.5.4 (for 6.x deployments). Upgrade immediately to applicable patched version to eliminate unauthenticated endpoint exposure. No workarounds identified; patching is mandatory remediation. If immediate upgrade is infeasible, restrict network access to Zammad instances using firewall rules limiting exposure to trusted IP ranges until patching completes. Verify post-upgrade that getting started endpoint requires authentication. Advisory URL: https://github.com/zammad/zammad/security/advisories/GHSA-hcm9-ch62-5727

More in Zammad

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An issue was discovered in Zammad before 1.0.4, 1.1.x before 1.1.3, and 1.2.x before 1.2.1. Rated critical severity (CVS
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An issue was discovered in Zammad before 1.0.4, 1.1.x before 1.1.3, and 1.2.x before 1.2.1, caused by lack of a protecti
CVE-2022-35490 CRITICAL
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Zammad 5.2.0 is vulnerable to privilege escalation. Rated critical severity (CVSS 9.8), this vulnerability is remotely e
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An issue was discovered in Zammad before 4.1.1. Rated critical severity (CVSS 9.8), this vulnerability is remotely explo
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An access control issue in Zammad v5.0.3 allows attackers to write entries to the CTI caller log without authentication.
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An issue was discovered in Zammad before 4.1.1. Rated critical severity (CVSS 9.1), this vulnerability is remotely explo
CVE-2017-6081 HIGH
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A CSRF issue was discovered in Zammad before 1.0.4, 1.1.x before 1.1.3, and 1.2.x before 1.2.1. Rated high severity (CVS
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An issue was discovered in Zammad before 4.1.1. Rated high severity (CVSS 8.8), this vulnerability is remotely exploitab
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Remote code execution in Zammad 7.0.0 allows authenticated administrators with high-level privileges to inject malicious

Same weakness CWE-284 – Improper Access Control

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Same technique Authentication Bypass

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CVE-2025-3248 CRITICAL POC
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CVE-2026-34723 vulnerability details – vuln.today
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