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Tue, 22 Sep 2026 20:30:00 +0000
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Tue, 22 Sep 2026 19:00:00 +0000
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| Description | MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the plaintext OAuth fallback file containing refresh and access tokens is written with permissions inherited from the process umask. Under common or permissive configurations, other local users can read the backup and retain Atlassian access through the refresh token. The advisory traces the vulnerable input and processing flow through OAuthConfig._save_tokens_to_file, refresh_token, access_token, and umask, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0. | |
| Title | MCP Atlassian: OAuth refresh-token backup file is world-readable under default Unix umask | |
| Weaknesses | CWE-732 | |
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cvssV4_0
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Subscriptions
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Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-09-22T19:08:30.218Z
Reserved: 2026-08-20T19:02:23.417Z
Link: CVE-2026-77256
Updated: 2026-09-22T19:08:21.334Z
Status : Received
Published: 2026-09-22T19:16:50.007
Modified: 2026-09-22T20:17:07.960
Link: CVE-2026-77256
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OpenCVE Enrichment
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