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TI-2026-45094 Aliases CVE-2026-63208

Zammad: Microsoft Graph error logs expose partially masked OAuth access tokens

Priority LOW 23CWE-116Published · Updated

Key facts

Attack vector
Network
Privileges required
High
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Information disclosure
Confidentiality · integrity · availability
Low · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-532.

Summary

Zammad is a web based open source helpdesk/customer support system. Prior to 7.1.2, when a Microsoft Graph request fails, Zammad logs the error including the authentication token used to access the mailbox. The system attempts to hide this token in the log, but the masking is incomplete: for the token format Microsoft uses (JWT), only the first part is hidden, while the remaining parts remain readable in plain text. A Zammad admin with Microsoft Graph channel access can view these logs and see the partial token, which may reveal sensitive claims such as the account scope, tenant, or timing, and could assist in reconstructing the full token while it is still valid. This issue is fixed in version 7.1.2.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00306 23rd percentileScored 2026-11-07
Fix Fixed zammad (zammad): 7.1.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Zammad GmbHzammadbefore 7.1.27.1.2Patch availableCNA
  • zammad VendorZammad GmbH Affected before 7.1.2 Fixed in 7.1.2 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:*——Zammad GmbH
  • cpe:2.3:a:zammad:zammad:*:*:*:*:*:*:*:* Versions — — ·Zammad GmbH

Remediation

  • Fix · CNA zammad (zammad) Fixed in 7.1.2

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-63208

References

Other 2

  • TI-2026-65406 Local privilege escalation in Zammad v1.5.0 to v7.2.2 installed via DEB or RPM package KEVCVSS 4.0CRITICAL 9.4
  • TI-2026-65405 Undisclosed RCE in Zammad v6.3 and higher KEVCVSS 4.0CRITICAL 9.4
  • TI-2024-22252 An issue was discovered in Zammad before 6.3.0. CVSS 3.1CRITICAL 9.1
  • TI-2026-11233 Zammad 7.0.1 - Improper authorization in ticket article attachment cloning CVSS 4.0HIGH 7.1
  • TI-2022-23785 A vulnerability in Zammad v5.3.0 allows attackers to execute arbitrary code or escalate… CVSS 3.1CRITICAL 9.8
  • TI-2026-58043 Zammad: Account takeover via unverified email matching during SSO auto-link CVSS 4.0CRITICAL 9.1
See all 123 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences