Vulnerability · Published Sep 25, 2026 · Assigned by GitHub_M

CVE-2026-84460Zammad: Missing Authorization in TagsController#list Allows Cross-Object Tag Enumeration

Medium 5.3

In plain English

A medium-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 18% of all known vulnerabilities).

Severity (CVSS 4.0)5.3Medium

Exploit odds (30 days)0.3%top 82.4% 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 7.1.2, any authenticated user can call the REST endpoint for getting a tag list and receive the tag names for the given ticket, regardless of whether they have access to that ticket. Tags are an internal categorization feature and may contain sensitive labels. Ticket IDs are sequential integers, making bulk enumeration straightforward. This issue is fixed in version 7.1.2.

Affected products (as reported)

Vendor	Product	Versions
zammad	zammad	< 7.1.2

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

References

https://github.com/zammad/zammad/security/advisories/GHSA-6vgm-xxp4-p6jv x_refsource_CONFIRM
https://github.com/zammad/zammad/commit/13217eb6b3fdf350228b13f8cf69f640b8fd0da2 x_refsource_MISC
https://github.com/zammad/zammad/commit/d1a5eabdd1285b202f75761c4406edc5509e217e x_refsource_MISC