Zammad: Microsoft Graph error logs expose partially masked OAuth access tokens
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
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| zammad | zammad | affected |
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No data.
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| Zammad | Zammad |
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No CVSS v3.1
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.306% probability within 30 days)
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Zammad
Zammad zammad |
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Zammad
Zammad zammad |
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ssvc
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| Description | 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. | |
| Title | Zammad: Microsoft Graph error logs expose partially masked OAuth access tokens | |
| Weaknesses | CWE-116 CWE-532 |
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| References |
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| Metrics |
cvssV4_0
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