# CVE-2026-84464: Zammad unauthorized data access in External Data Source

Source: https://junglewise.ai/threats/cve-2026-84464-zammad-is-a-web-based-open-source-helpdesk-customer-support  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-25. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-84464 · Severity: info · Published 2026-09-25

Zammad is an open-source helpdesk system that handles customer support tickets and account information. A flaw in its External Data Source feature failed to check whether users had permission to access specific tickets, customer accounts, teams, or organizations. An attacker with even basic customer access could view confidential information belonging to other customers or teams by referencing their record IDs.

Technologies: [Zammad](https://junglewise.ai/threats/technologies/zammad). Vendors: [Zammad](https://junglewise.ai/threats/vendors/zammad).

## Quick answers

**Is CVE-2026-84464 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-84464 being exploited in the wild.

**How severe is CVE-2026-84464?** Informational severity, published 25 September 2026.

**Which products and versions are affected?** Zammad prior to 7.1.2.

**Is there a fix for CVE-2026-84464?** A patch was published on 2026-08-04: Fixed in version 7.1.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-84464 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-84464?** Check whether you run Zammad at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

This is an IDOR (Insecure Direct Object Reference) vulnerability in the External Data Source rendering context. The vulnerable code fetched records by ID without authorization checks before passing them to external systems. An authenticated attacker with low privileges could bypass access controls to view ticket details, user profiles, group information, and organization data. The fix adds an authorized_record() call to verify permissions before including data in requests.

## Affected products

- Zammad Zammad prior to 7.1.2

## Timeline

- 2026-08-04: disclosed
- 2026-08-04: patched: Fixed in version 7.1.2

## References

- [https://github.com/zammad/zammad/commit/34bdf46273adbea03821ac7157c8beaacde03a4b](https://github.com/zammad/zammad/commit/34bdf46273adbea03821ac7157c8beaacde03a4b)
- [https://github.com/zammad/zammad/security/advisories/GHSA-jvm2-cr58-4qxp](https://github.com/zammad/zammad/security/advisories/GHSA-jvm2-cr58-4qxp)

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