What’s Vulnerable › Vulnerabilities

CVE-2020-29158

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-12-28 · updated 2026-06-17
• Weakness: CWE-862

Description

An issue was discovered in Zammad before 3.5.1. An Agent with Customer permissions in a Group can bypass intended access control on internal Articles via the Ticket detail view.

Affected products

• zammad: before 3.5.1 — fixed in 3.5.1

How to fix

Upgrade to a fixed version: zammad 3.5.1. Check the vendor advisory for mitigations.

References

• https://github.com/zammad/zammad/commit/cf5a5e396058d4b134dd33d0a62b11c1733c98ab
• https://zammad.com/en/advisories/zaa-2020-23
• https://github.com/zammad/zammad/commit/cf5a5e396058d4b134dd33d0a62b11c1733c98ab
• https://zammad.com/en/advisories/zaa-2020-23

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