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Advisory record · GHSA-mrq8-fv7v-hhjg

MCP Atlassian: HTTP upload tools accept arbitrary server-local file paths

CVSS 8.3 HighEPSS 0.0039 · 33rd 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-mrq8-fv7v-hhjg · CVE-2026-77257 · PYSEC-2026-4098
Weakness (CWE)
CWE-22
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 package, versions before 0.22.0, lets callers attach server-local files through its HTTP upload tools for Jira and Confluence. An authenticated caller, or an AI agent that can make tool calls, can have the server read any file its process can access and attach it to an issue or page using the configured Atlassian credentials, which can expose local secrets. Upgrade to mcp-atlassian 0.22.0 or later. The source describes no workaround that users can apply themselves.

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
8.3 High 4.0 CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0039, the 33rd percentile, on 10 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.