CVE-2026-27826 Details.
mcp-atlassian < 0.17.0 - Server-Side Request Forgery
Atlas does not check this one. Needs an outside server.
To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one.
About CVE-2026-27826. What It Means.
MCP Atlassian < 0.17.0 contains a server-side request forgery caused by improper validation of custom HTTP headers in the HTTP middleware, letting unauthenticated attackers force outbound requests to arbitrary URLs, exploit requires access to the mcp-atlassian HTTP endpoint.
Affected Product. What Is Hit.
- Vendor
- sooperset
- Product
- Sooperset Mcp Atlassian
FAQ
Common Questions.
mcp-atlassian < 0.17.0 - Server-Side Request Forgery. MCP Atlassian < 0.17.0 contains a server-side request forgery caused by improper validation of custom HTTP headers in the HTTP middleware, letting unauthenticated attackers force outbound requests to arbitrary URLs, exploit requires access to the mcp-atlassian HTTP endpoint.
No. To test for this one, the site would have to contact a server outside your network and report back. Atlas does not run checks that need that, so it does not run this one. The facts about CVE-2026-27826 are on this page, and you can request a demo to see how Brandefense watches your whole external attack surface.
CVE-2026-27826 is not on the CISA Known Exploited Vulnerabilities list at the time of writing, but it is still worth fixing.
Update Sooperset Mcp Atlassian to the latest version from the vendor, or follow the vendor's advice to switch off the affected feature. Vendor links are listed on this page when they are known.
This page lists the public facts about CVE-2026-27826. Atlas does not run a check for it, so nothing here says whether a particular site is affected.