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CVE-2026-27826 is a server-side request forgery vulnerability in MCP Atlassian versions before 0.17.0. The HTTP middleware and dependency-injection layer accepts attacker-supplied Atlassian upstream destination values from two custom request headers when no Authorization header is present, without adequate URL validation. An unauthenticated party able to reach the HTTP service can cause the MCP server to issue outbound HTTP requests to arbitrary attacker-selected destinations. Because the flaw occurs before MCP tool-handler dispatch, tool-level security review may not identify the vulnerable path.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
15 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A prior SSRF vulnerability in mcp-atlassian whose remediation introduced URL validation and a redirect-validation hook. The current advisory identifies an unhooked Jira user-permission lookup path that leaves a residual redirect-based blind SSRF condition.
An SSRF vulnerability in mcp-atlassian caused by unvalidated X-Atlassian-Jira-Url and X-Atlassian-Confluence-Url headers, enabling redirection of outbound requests to attacker-controlled infrastructure and forming part of an unauthenticated SSRF-to-RCE chain.
An SSRF vulnerability referred to as CVE-2026-27826 in mcp-atlassian.
One of two vulnerabilities in the Atlassian MCP server that can be chained to achieve unauthenticated remote code execution from the local network.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.