---
title: "CVE-2026-77253: MCP Atlassian - Path Traversal"
description: "MCP Atlassian < 0.22.0 contains a path traversal caused by accepting arbitrary local filesystem paths in attachment upload tools, letting remote attackers disclose sensitive files across client-server boundary, exploit requires network access."
url: https://panop.io/threat-heartbeat/CVE-2026-77253/
---

# CVE-2026-77253 MCP Atlassian - Path Traversal

MCP Atlassian < 0.22.0 contains a path traversal caused by accepting arbitrary local filesystem paths in attachment upload tools, letting remote attackers disclose sensitive files across client-server boundary, exploit requires network access.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

Proof of concept available

Authentication

Required

EPSS

0.37% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-77253)

## Details

Type

Path Traversal

Impact

Information Disclosure, File System Read

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Published

22 September 2026

Updated

15 October 2026

Weakness

[CWE-22](https://cwe.mitre.org/data/definitions/22.html)

## Vendor fix

Update to version 0.22.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-77253](https://nvd.nist.gov/vuln/detail/CVE-2026-77253)
- [https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-vc25-24vv-fxxm](https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-vc25-24vv-fxxm)
- [https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460](https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460)
- [https://github.com/sooperset/mcp-atlassian/pull/1448](https://github.com/sooperset/mcp-atlassian/pull/1448)
- [https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0](https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0)

[← All CVEs](https://panop.io/threat-heartbeat/)

## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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