Mcp Atlassian CVE-2026-73496

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EUVD

EUVD-2026-77795 HIGH

Path Traversal (CWE-22)

2026-09-14 GitHub_M

Path Traversal Atlassian Mcp Atlassian

7.7

CVSS 3.1 · Vendor: GitHub_M

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Vulnerability Assessment

Weakness

CWE

OWASP Top 10:2025

A01:2025 - Broken Access Control

ASVS 5.0

V5 - File Handling Path canonicalization, traversal prevention

MITRE ATT&CK

2 techniques across 2 tactics: Discovery, Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Sep 15, 2026

MCP Atlassian, the Model Context Protocol server that bridges AI clients to Confluence and Jira, resolves client-supplied attachment paths on the server itself, so a remote client with write-tool access can read arbitrary files from the server host in versions before 0.22.0. The confluence_upload_attachment, confluence_upload_attachments and jira_update_issue tools all funnel an unconfined file_path into os.path.abspath() plus open(), and the resulting bytes are uploaded to Atlassian as an attachment — giving the attacker a convenient exfiltration channel for server files, environment-held Atlassian credentials, or other tenants' data. The vendor advisory includes a working proof-of-concept (publicly available exploit code exists), but no active exploitation is confirmed (no CISA KEV listing); the CVSS 3.1 score is 7.7 with EPSS not provided in the input. Only local single-user stdio deployments are outside the trust boundary.

Affected VersionsENISA

mcp-atlassian < 0.22.0

Affected Packages

pypi mcp-atlassian fix: 0.22.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in pypi

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (GitHub_M) PRIMARY 7.7 HIGH

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

Primary rating from Vendor (GitHub_M) · only source for this CVE.

CVSS VectorVendor: GitHub_M

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

2

Patch available

Sep 14, 2026 - 21:18 EUVD

CVE Published

Sep 14, 2026 - 19:49 cve.org

HIGH 7.7

DescriptionCVE.org

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the confluence_upload_attachment and confluence_upload_attachments tools pass a client-controlled file_path through src/mcp_atlassian/confluence/attachments.py upload_attachment, and the jira_update_issue attachments parameter reaches src/mcp_atlassian/jira/attachments.py upload_attachment, without confining either path to an approved server workspace. In a remote HTTP, SSE, or multi-user deployment, absolute or traversing paths are resolved on the MCP server and uploaded to Atlassian, allowing a client with write-tool access to disclose server files, environment-held Atlassian credentials, or another tenant's data. A local single-user stdio deployment does not cross this trust boundary because the server runs in the caller's environment. This issue is fixed in version 0.22.0.

Technical POC Analysis

CWE-22 (Improper Limitation of a Pathname to a Restricted Directory / Path Traversal), with CWE-73 (External Control of File Name or Path) as the secondary classification.

Full technical POC analysis - root cause, step-by-step exploitation and patch breakdown - is part of the Pro and Business plans.

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Threat Intelligence Overview

EPSS Score

0.3%

Top 74% exploitable

Data Quality

5 sources

Confidence: Medium

EUVD

CVE.org

EPSS

GitHub

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.3%

Patch available Yes

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

No

Human Impact· derived

Medium

Priority Score

38

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +38

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Path Traversal HIGH

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.

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References

Advisories & patches

REF https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 REF https://github.com/sooperset/mcp-atlassian/pull/1448 REF https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0 REF https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-wm45-qh3g-v83f

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