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Back to active CVEs
High · CVSS 8.3CVE-2026-77260GHSA-F4P7-QX46-WC5J

MCP Atlassian: Arbitrary local file READ via unconstrained file_path in upload_attachment (Confluence + Jira)CVE-2026-77260

Answer in brief

CVE-2026-77260 records a High severity (CVSS 8.3) vulnerability in MCP Atlassian: Arbitrary local file READ via unconstrained file_path in upload_attachment (Confluence + Jira). The current sources do not mark it as known exploited. The current feed maps sooperset/mcp-atlassian (generic), mcp-atlassian (pip), mcp-atlassian (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 22, 2026Updated Sep 29, 2026Source checked Nov 6, 2026First seen by HOL Sep 22, 2026Material review Sep 29, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 8.3
Exploitation
Not marked as known exploited
Affected software
4 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 8.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps sooperset/mcp-atlassian (generic), mcp-atlassian (pip), mcp-atlassian (pypi). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
sooperset/mcp-atlassiangeneric<0.22.00.22.0
mcp-atlassianpip<0.22.00.22.0
mcp-atlassianpypi>=0 <0.22.00.22.0

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for sooperset/mcp-atlassian, mcp-atlassian, mcp-atlassian.
  2. 2Review the reported fix. Update sooperset/mcp-atlassian to 0.22.0; mcp-atlassian to 0.22.0; mcp-atlassian to 0.22.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 22, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Sep 29, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 22, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • NVD vulnerability recordnvd.nist.gov
  • GitHub security advisorygithub.com
Upstream source description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the Confluence and Jira upload_attachment implementations accept an unconstrained file_path and open the referenced server-local file. A permitted MCP caller can upload sensitive host files to an Atlassian destination and then retrieve their contents. The advisory traces the vulnerable input and processing flow through upload_attachment, file_path, and CVE-2026-27825, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • DDEV incomplete tar symlink traversal fix allows host file overwrite - Incomplete fix of CVE-2026-32885Also CWE-22
  • Kopia through 0.23.1 Path Traversal in Snapshot Restore via Directory Entry NamesAlso CWE-22
  • CloudBeaver: Path Traversal in Resource Manager getProjectPath allows directory enumeration outside shared-projects sandboxAlso CWE-22
  • CloudBeaver: Path Traversal in updateResultsDataBatch Allows Unauthorized Server File Stream AccessAlso CWE-22
  • GeoNode: OS command injection via uploaded file layer nameSame pip ecosystem
  • GeoNode: Unrestricted File UploadSame pip ecosystem

Record context

Vulnerability class
Path Traversal
EPSS
Not reported
CWE IDs
CWE-22
Source
CVE List V5
Source checked
Nov 6, 2026
References
7 linked sources
Open source record