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CVE-2026-27826

MCP Atlassian - HTTP Endpoint

Atlassian CVSS 8.2 Updated April 6, 2026

Executive Risk Summary

"An unauthenticated attacker can force the MCP Atlassian server to make outbound HTTP requests to an arbitrary URL, potentially leading to internal network reconnaissance and theft of IAM role credentials. This vulnerability is fixed in version 0.17.0."

Anticipated Attack Path

  1. 1. Attacker sends crafted HTTP request to MCP Atlassian server
  2. 2. Server processes request without authentication
  3. 3. Server makes outbound HTTP request to attacker-controlled URL

Am I Vulnerable?

  • Verify MCP Atlassian server version is 0.17.0 or later
  • Monitor server logs for suspicious outbound HTTP requests
  • Restrict access to the MCP Atlassian HTTP endpoint

Operational Audit Arsenal

Target Type Service
Target Asset mcp-atlassian
Standard Path GitHub repository

Manual Verification Required

This is a non-Windows asset (Atlassian). Use the target asset details and official path provided above to verify your current version against the official vendor advisories listed below.

Patch Impact Forecast

Reboot Required Unlikely

Minimal, as the patch only updates the HTTP middleware and dependency injection layer

Internal Work Notes

MCP Atlassian server vulnerability allows unauthenticated attackers to perform outbound HTTP requests, potentially exposing internal network information and IAM role credentials. Upgrade to version 0.17.0 or later to fix the issue.

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Intelligence Sources

Related Atlassian Threats

Data compiled from NVD, MSRC, and CISA KEV Catalog. Intelligence synthesized via AI. Scripts provided for diagnostic purposes under MIT License.