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Medium severity5.4NVD Advisory· Published Sep 22, 2026· Updated Sep 28, 2026

CVE-2026-77272

CVE-2026-77272

Description

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
mcp-atlassianPyPI
< 0.22.00.22.0

Affected products

3
  • Sooperset/Mcp Atlassian2 versions
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*range: <0.22.0
    • (no CPE)range: <0.22.0
  • Atlassian/mcp-atlassianllm-fuzzy
    Range: <0.22.0

Patches

Vulnerability mechanics

References

5

News mentions

1