CVE-2026-84460Network attack vectorHinoki check available

Cross-ticket tag disclosure via unchecked ticket identifier

Published Sep 25, 2026 · Updated Sep 25, 2026

Authorization bypass in Zammad 7.1.1 and earlier allows remote authenticated users to read tags from tickets they cannot access. TagsController#list accepts a user-controlled sequential ticket identifier and returns that ticket's tag names without checking ticket access. Any authenticated account can enumerate identifiers in bulk, exposing internal labels but not ticket contents or modification capabilities.

CVSS severity5.3
Medium
EPSS probability0.26%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Authorization bypass in Zammad 7.1.1 and earlier allows remote authenticated users to read tags from tickets they cannot access. TagsController#list accepts a user-controlled sequential ticket identifier and returns that ticket's tag names without checking ticket access. Any authenticated account can enumerate identifiers in bulk, exposing internal labels but not ticket contents or modification capabilities.

The record

CVE
CVE-2026-84460
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
Zammad GmbH
Product
Zammad
Classifications
CWE-639
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 7.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Zammad GmbH · Zammadversion=< 7.1.2

Published CVSS scores

5.3ZammadCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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