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    CVE-2026-77272

    MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the OAuth error query parameter is passed to CallbackHandler._send_response in oauth_setup.py and interpolated into an HTML page without escaping. A crafted authorization callback can inject markup or script that executes in the browser of a user completing the OAuth flow. This issue is fixed in version 0.22.0.

    Published:Sep 22, 2026
    Last Modified:Sep 28, 2026
    EPS:Sep 22, 2026
    EPSS Score:0.00243
    CVSS Score:5.4

    Affected Products

    Vendor
    Mcp-atlassian
    Product
    Mcp Atlassian
    Vendor
    Sooperset
    Product
    Mcp-atlassian

    Exploits

    https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-g2r2-3j32-j27x

    Related CVEs

    CVE-2026-77246 (CVSS 7.4) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …
    CVE-2026-77248 (CVSS 8.6) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …
    CVE-2026-77256 (CVSS 8.3) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …
    CVE-2026-77249 (CVSS 5.3) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …
    CVE-2026-77259 (CVSS 7.7) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …
    CVE-2026-77268 (CVSS 5.5) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …
    CVE-2026-77247 (CVSS 8.3) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …
    CVE-2026-77269 (CVSS 6.5) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …
    CVE-2026-77266 (CVSS 6.5) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …
    CVE-2026-77255 (CVSS 8.6) — MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High