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CVE-2026-77253 high CVSS 7.1

Path Traversal in mcp-atlassian (CVE-2026-77253)

Summary

Path traversal in mcp-atlassian (CVE-2026-77253). Confidential information can be exposed externally. Exploitable via file_path. Mitigation: upgrade to 0.22.0 or later.

Original description

The description as published by the source.

Summary

MCP Atlassian exposes Jira and Confluence attachment upload tools that accept arbitrary local filesystem paths and upload those file contents to Atlassian. In HTTP or multi-user deployments, an MCP caller who can invoke write tools can cause the server to read any file accessible to the MCP process and send it to Jira/Confluence as an attachment.

Details

The Confluence MCP upload tool accepts a file_path described as an absolute or relative server path in src/mcp_atlassian/servers/confluence.py:1290-1316 and forwards it directly to confluence_fetcher.upload_attachment() in src/mcp_atlassian/servers/confluence.py:1356-1363. The multi-upload variant accepts comma-separated local paths in src/mcp_atlassian/servers/confluence.py:1372-1449.

The Confluence attachment implementation converts relative paths to absolute paths, checks only existence, and then opens the path for upload. There is no call to validate_safe_path() or any allowed directory check for uploads in src/mcp_atlassian/confluence/attachments.py:61-79; the direct upload path opens the file with open(file_path, "rb") in src/mcp_atlassian/confluence/attachments.py:467-490.

The Jira upload implementation has the same pattern: it converts relative paths, checks existence, and opens the path in src/mcp_atlassian/jira/attachments.py:371-388. Jira issue update also accepts an attachments field as JSON or CSV local paths in src/mcp_atlassian/servers/jira.py:1609-1662, forwards it…

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-2026-77253 has been found in mcp-atlassian.
Attackers can target a specific entry point like file_path over the network to misuse the product.
Confidential information can be exposed externally. CVSS score: 7.1/10.
What to do: upgrade mcp-atlassian to 0.22.0 or later.
If unsure, ask your IT team or search "mcp-atlassian CVE-2026-77253" on the vendor's site.

CVE-2026-77253 (mcp-atlassian) — CWE-22 / CVSS v3 7.1
Attack vector: remote (network-reachable) / no user interaction
Attack surface: file_path / attachments
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 file_path.

📍 Affected scope

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

🔥 Severity

Severity: High (CVSS 7.1/10). 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

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