Sign in Sign up
JA · EN · FR
SecPulse
Categories
CVE-2026-77269 medium CVSS 6.5

Path Traversal in mcp-atlassian (CVE-2026-77269)

Summary

Path traversal in mcp-atlassian (CVE-2026-77269). Confidential information can be exposed externally. Exploitable via confluence_upload_attachment. Mitigation: upgrade to 0.22.0 or later.

Original description

The description as published by the source.

Summary

The confluence_upload_attachment and confluence_upload_attachments MCP tools accept a file_path parameter and do not validate that the path is confined to an allowed directory before opening the file. An attacker who can call these tools can read any file accessible to the MCP server process (SSH keys, .env files, API credentials) and exfiltrate it by uploading it to Confluence.

Note: The Jira upload_attachment mixin method in jira/attachments.py has the same missing validation, but it is NOT registered as an MCP tool in servers/jira.py and is therefore not currently reachable via MCP. It should still be patched to prevent future exposure if Jira upload tools are added.

This is an incomplete fix for CVE-2026-27825. That CVE was patched by adding validate_safe_path() to download operations (v0.17.0). The same protection was not applied to upload operations.

Details

validate_safe_path() is imported in both confluence/attachments.py and jira/attachments.py and is correctly called in all download functions. It is absent from the Confluence upload functions (which are exposed as MCP tools) and from the Jira upload mixin methods (which are not currently registered as MCP tools but should still be patched).

Download (protected — correctly patched):

# confluence/attachments.py:222-223
validate_safe_path(target_path)  # resolves symlinks + checks is_relative_to(cwd)

Upload (vulnerable — not patched):

# confluen…

Source: NIST National Vulnerability Database NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-77269 has been found in mcp-atlassian.
Attackers can target a specific entry point like confluence_upload_attachment over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 6.5/10.
What to do: upgrade mcp-atlassian to 0.22.0 or later.
If unsure, ask your IT team or search "mcp-atlassian CVE-2026-77269" on the vendor's site.

CVE-2026-77269 (mcp-atlassian) — CWE-22 / CVSS v3 6.5
Attack vector: remote (network-reachable) / no user interaction
Attack surface: confluence_upload_attachment / confluence_upload_attachments / file_path / upload_attachment
Patched: 0.22.0 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

Path traversal (CWE-22) exists in mcp-atlassian. Attackers reach the vulnerable code path via confluence_upload_attachment.

📍 Affected scope

Check the vendor advisory for the affected versions of mcp-atlassian. Attack surface: confluence_upload_attachment / confluence_upload_attachments / file_path / upload_attachment.

🔥 Severity

Severity: Medium (CVSS 6.5/10). Confidential information can be exposed externally.

🔧 How to fix

Update to 0.22.0.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'mcp-atlassian' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r 'mcp-atlassian' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で mcp-atlassian を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Apply patch patch 
    Upgrade mcp-atlassian to 0.22.0

    ステージング環境で 0.22.0 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

pip mcp-atlassian
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.22.0"}]}]

References

We use cookies for analytics and ad measurement. This setting applies to all Game co., Ltd. sites. Details