CVE-2026-77244 / CVE-2026-77258: mcp-atlassian HTTP authentication bypass and arbitrary file read (< 0.22.0)
- Product
- mcp-atlassian (PyPI)
- CVE
- CVE-2026-77244, CVE-2026-77258
- Affected
- < 0.22.0
- Fixed in
- 0.22.0
Last verified against sources: October 16, 2026
Am I affected?
mcp-atlassian (PyPI): affected < 0.22.0. Fixed in 0.22.0.
What to do now
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.
What happened
- According to GitHub Advisory Database's advisory (Sept 22, 2026), AtlassianOpaqueTokenVerifier.verify_token() in mcp-atlassian accepted any non-empty string as a valid token in HTTP transport deployments (CVE-2026-77244). [1]
- Separately, upload_attachment read and uploaded local files to Confluence without calling validate_safe_path() (CVE-2026-77258). [2]
Impact
What was done
Sources
- GHSA-wrhw-j3f9-8vc6 (CVE-2026-77244) — GitHub Advisory Database
- GHSA-93xw-j965-9mx3 (CVE-2026-77258) — GitHub Advisory Database
Every statement above was checked against these sources before publishing. Spotted an error? Tell us and we will correct it with a dated note.
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[CVE-2026-77244, CVE-2026-77258] CVE-2026-77244 / CVE-2026-77258: mcp-atlassian HTTP authentication bypass and arbitrary file read (< 0.22.0)
Product: mcp-atlassian (PyPI) | Affected: < 0.22.0 | Fixed in: 0.22.0
Summary: According to GitHub Advisory Database's advisory (Sept 22, 2026), AtlassianOpaqueTokenVerifier.verify_token() in mcp-atlassian accepted any non-empty string as a valid token in HTTP transport deployments (CVE-2026-77244).
Source & remediation on AgentArmorHQ: https://agentarmorhq.com/incidents/2026/09/cve-2026-77244-77258-mcp-atlassian-auth-file-readCorrections
Report an error or request a correction. We review requests within 5 business days and add a dated correction note.
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