CVE-2026-77271
8.8 HIGHpublic exploit availablePublished 2026-09-22 · Updated 2026-09-28
AI risk analysis
- Summary
- The flaw allows attackers to write files within the working directory, potentially leading to code execution by importing the modified module.
- Exploitability
- Exploitation is relatively easy as it requires an attacker to manipulate file writes within the working directory. Precondition is access to the Confluence attachment call sites.
- Blast radius
- If exploited, the impact could be severe, allowing for code execution within the application, potentially leading to full system compromise.
- Detection
- No reliable host or network indicator is derivable from the published description.
- Prioritized remediation
- Upgrade to version 0.22.0 or later.
Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.
NVD description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_safe_path defaults its base directory to os.getcwd(), and affected Confluence attachment call sites omit base_dir, allowing attacker-selected writes within the working directory. This Python module overwrite can provide code execution when the application later imports the modified module, bypassing the remediation tracked as CVE-2026-27825. This issue is fixed in version 0.22.0.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-22, CWE-94
Vendors
mcp-atlassian
Products
mcp atlassian
Public exploit & PoC references
- https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460[Patch]
- https://github.com/sooperset/mcp-atlassian/pull/1448[Issue Tracking, Patch]
- https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0[Release Notes]
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6vmq-24h2-pj7j[Exploit, Vendor Advisory]
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6vmq-24h2-pj7j[Exploit, Vendor Advisory]
All references
- https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460
- 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/security/advisories/GHSA-6vmq-24h2-pj7j
- https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-6vmq-24h2-pj7j
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.
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