Am I affected by MCP Atlassian: SSRF Protection Bypass? What should I do?
A safety check in mcp-atlassian that is meant to stop requests to internal servers can be bypassed.
Affected: mcp-atlassian < 0.22.0. Fixed in: 0.22.0. What should you check, and what should you do about it?
Full incident page with sources: https://agentarmorhq.com/incidents/2026/09/cve-2026-77274-mcp-atlassian (opens external site)
1 answer
Am I affected? Affected: mcp-atlassian < 0.22.0. Fixed in: 0.22.0.
- Check your version: run
pip show mcp-atlassian. Versions < 0.22.0 of mcp-atlassian are affected.
What to do now
- Upgrade to the fixed version: run
pip install --upgrade "mcp-atlassian>=0.22.0"(first patched version 0.22.0). - Upgrade to mcp-atlassian 0.22.0.
General practice, not from the source: if the affected software could read tokens or credentials, rotate them after upgrading; pin versions and review changes before updating tools your agents run.
Sources
- GitHub Advisory Database: https://github.com/advisories/GHSA-hgcf-4mq8-5266 (opens external site)
Full incident page: https://agentarmorhq.com/incidents/2026/09/cve-2026-77274-mcp-atlassian (opens external site)
Did this work for you?- Check your version: run