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Advisory record · GHSA-cc5h-2pwp-pvcc

MCP Atlassian: Unauthenticated arbitrary local file read via upload_attachment file_path, chained with missing auth on streamable-http transport

CVSS 8.6 HighEPSS 0.0047 · 41st percentile

Published by the GitHub Advisory Database at 22 Sept 2026, 20:34 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
mcp-atlassianPyPI<0.22.00.22.0
Identifiers
GHSA-cc5h-2pwp-pvcc · CVE-2026-77248 · PYSEC-2026-4089
Weakness (CWE)
CWE-22 · CWE-306
Tags
Published
22 Sept 2026
Updated
1 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The mcp-atlassian PyPI package (versions before 0.22.0) is vulnerable when run with the streamable-http transport using global operator Atlassian credentials, where tools are reachable without authentication. The upload_attachment tool accepts an arbitrary file_path with no validation, so an unauthenticated network client can upload files from the server host to a Confluence or Jira item and read them back, exposing secrets such as the operator's API token. Upgrade to version 0.22.0 or later; the source does not list a workaround beyond requiring authentication on the transport.

Written 1 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
8.6 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0047, the 41st percentile, on 11 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:09 UTC First seen by agentprime
  2. 31 Oct 2026, 14:09 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.