---
title: "CVE-2026-77259: MCP Atlassian - Path Traversal"
description: "MCP Atlassian < 0.22.0 contains a path traversal caused by lack of path validation in confluence_upload_attachment, letting attackers upload and read arbitrary server-local files, exploit requires attacker to control file path input."
url: https://panop.io/threat-heartbeat/CVE-2026-77259/
---

# CVE-2026-77259 MCP Atlassian - Path Traversal

MCP Atlassian < 0.22.0 contains a path traversal caused by lack of path validation in confluence\_upload\_attachment, letting attackers upload and read arbitrary server-local files, exploit requires attacker to control file path input.

CVSS base score 7.7 /10

High

CISA KEV

Not listed

Public exploit

Proof of concept available

Authentication

Required

EPSS

0.41% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-77259)

## Details

Type

Path Traversal

Impact

File System Read, Information Disclosure

CVSS vector

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

Published

22 September 2026

Updated

15 October 2026

Weakness

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

## Vendor fix

Upgrade 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-2026-77259](https://nvd.nist.gov/vuln/detail/CVE-2026-77259)
- [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)
- [https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6cr4-ccf3-x7h4](https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6cr4-ccf3-x7h4)

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## 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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