Vulnerability · Published Sep 25, 2026 · Assigned by GitHub_M

CVE-2026-56724Zammad: Incorrect implementation of permission checks in the knowledge base module

High 7.1

In plain English

A high-severity authorization bypass via user-controlled key in zammad from zammad. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 20% of all known vulnerabilities).

Severity (CVSS 4.0)7.1High

Exploit odds (30 days)0.3%top 80.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

Zammad is a web based open source helpdesk/customer support system. Prior to 7.0.2, summary An issue with permission checks in the knowledge base management area has been identified. Under certain conditions, data validation for linked items was not fully enforced. This could have allowed users with limited read permissions to interact with items outside their assigned access scope. Data access has been strengthened in the current version through additional validation routines. This issue is fixed in version 7.0.2.

Affected products (as reported)

Vendor	Product	Versions
zammad	zammad	< 7.0.2

Weakness: CWE-639, CWE-862 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

References

https://github.com/zammad/zammad/security/advisories/GHSA-pv3q-74g5-w7fv x_refsource_CONFIRM
https://github.com/zammad/zammad/commit/13ccc136e527adcab705ca8a3b2fb9ffc0cecddc x_refsource_MISC
https://github.com/zammad/zammad/releases/tag/7.0.2 x_refsource_MISC