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CVE-2026-77250

CVE-2026-77250 · MCP Atlassian: OAuth fallback token storage writes plaintext access and refresh tokens with group-readable permissions

Esta página presenta datos de fuentes públicas de vulnerabilidades. Consulta el aviso original antes de actualizar.

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, OAuthConfig writes a plaintext fallback file containing access and refresh tokens under the user's .mcp-atlassian directory using process-default permissions. On systems with a permissive umask, same-group or other local users and processes can read the persisted tokens and reuse the associated Atlassian access. The advisory traces the vulnerable input and processing flow through OAuthConfig._save_tokens, ~/.mcp-atlassian/oauth-<client_id>.json, access_token, and refresh_token, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

CVSS 6.1 · Media · EPSS 0,1% · Corrección disponible

Publicación
Actualización

Pila tecnológica: python

Productos y versiones afectados

  • mcp-atlassian

    Versiones
    • < 0.22.0: Afectada

    Sin corrección publicada

  • mcp-atlassian PyPI

    Versiones
    • 0.1.1
    • 0.1.10
    • 0.1.11
    • 0.1.12
    • 0.1.13
    • 0.1.14
    • 0.1.15
    • 0.1.16
    • 0.1.2
    • 0.1.3
    • 0.1.4
    • 0.1.6
    • 0.1.7
    • 0.1.8
    • 0.1.9
    • 0.10.0
    • 0.10.1
    • 0.10.2
    • 0.10.3
    • 0.10.4
    • 0.10.5
    • 0.10.6
    • 0.11.0
    • 0.11.1
    • 0.11.10
    • 0.11.11
    • 0.11.12
    • 0.11.2
    • 0.11.2a2
    • 0.11.3
    • 0.11.4
    • 0.11.5
    • 0.11.6
    • 0.11.7
    • 0.11.8
    • 0.11.9
    • 0.12.0
    • 0.13.0
    • 0.13.1
    • 0.14.0
    • 0.14.1
    • 0.14.2
    • 0.14.3
    • 0.15.0
    • 0.16.0
    • 0.16.1
    • 0.17.0
    • 0.18.0
    • 0.18.1
    • 0.19.0
    • 0.2.0
    • 0.2.1
    • 0.2.2
    • 0.2.3
    • 0.2.4
    • 0.2.5
    • 0.2.6
    • 0.20.0
    • 0.20.1
    • 0.21.0
    • 0.21.1
    • 0.3.0
    • 0.3.1
    • 0.4.0
    • 0.5.0
    • 0.6.0
    • 0.6.1
    • 0.6.2
    • 0.6.3
    • 0.6.4
    • 0.6.5
    • 0.7.0
    • 0.7.1
    • 0.8.0
    • 0.8.1
    • 0.8.2
    • 0.8.3
    • 0.8.4
    • 0.9.0
    Intervalos de versiones afectados
    • ECOSYSTEM: < 0.22.0

    Actualiza a 0.22.0

Fuentes originales

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