# CVE-2026-63208: Zammad OAuth token exposure in Microsoft Graph error logs

Source: https://junglewise.ai/threats/cve-2026-63208-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-2026-63208 · Severity: info · Published 2026-09-25

Zammad is an open source helpdesk and customer support system used by organizations to manage support requests. When Microsoft Graph authentication fails, Zammad logs the error but incompletely masks the OAuth token, leaving most of the JWT token visible in plain text. An administrator with access to Microsoft Graph channel logs can read these partial tokens and extract sensitive information like account scope or tenant ID, potentially helping reconstruct the full token while still valid.

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

## Quick answers

**Is CVE-2026-63208 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-63208 being exploited in the wild.

**How severe is CVE-2026-63208?** Informational severity, published 25 September 2026.

**Which products and versions are affected?** Zammad through 7.1.1.

**Is there a fix for CVE-2026-63208?** A patch was published on 2026-08-03: version 7.1.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-63208 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-63208?** 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

JWT tokens used by Microsoft Graph are logged with only the first part masked while the second and third parts (payload and signature) remain visible. An authenticated administrator with Microsoft Graph channel access can view HTTP logs containing these partial tokens and extract claims that aid token reconstruction. The fix in version 7.1.2 improves the log masking regex to properly hide all JWT parts.

## Affected products

- Zammad Zammad through 7.1.1

## Timeline

- 2026-09-25: disclosed
- 2026-08-03: patched: version 7.1.2

## References

- [https://github.com/zammad/zammad/commit/2be46473eee405cc65b86a85d17059802e658532](https://github.com/zammad/zammad/commit/2be46473eee405cc65b86a85d17059802e658532)
- [https://github.com/zammad/zammad/security/advisories/GHSA-qh8m-g5vr-7272](https://github.com/zammad/zammad/security/advisories/GHSA-qh8m-g5vr-7272)

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