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CVE-2026-77274

8.2, high

Sooperset mcp-atlassian Server-Side Request Forgery Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab)
CVSS
8.2, high high CVSS v3.1
EPSS, next 30 days
0.3% higher than 23.8% of scored CVEs
Exploitation
Exploit code published
Published
22 Sept 202625 days ago

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, validate_url_for_ssrf has a backslash authority confusion because it interprets the authority differently from the Requests connection layer in the header-based Jira and Confluence URL authentication flow. A crafted URL can validate as an external hostname while the HTTP client connects to an internal host, permitting server-side requests to protected network resources. This issue is fixed in version 0.22.0.

Details

Vendor
Sooperset
Product
mcp-atlassian
Weakness
CWE-918 (opens in a new tab)
Status
Analyzed
Updated
28 Sept 2026
Assigner
security-advisories@github.com

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N

References 4

Exploit code 1

Patches and fixes 2

Other references 1

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other Sooperset CVEs

Every Sooperset CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-77260 Sooperset mcp-atlassian Path Traversal Vulnerability EPSS 0.3% 7.5, high
  • CVE-2026-77261 Sooperset mcp-atlassian Server-Side Request Forgery Vulnerability EPSS 0.3% 8.5, high
  • CVE-2026-77265 Sooperset mcp-atlassian Server-Side Request Forgery Vulnerability EPSS 0.3% 7.5, high
  • CVE-2026-77271 Sooperset mcp-atlassian Path Traversal Vulnerability EPSS 0.5% 8.8, high
  • CVE-2026-77246 Sooperset mcp-atlassian Path Traversal Vulnerability EPSS 0.4% 8.6, high

Beyond this page

Is CVE-2026-77274 in your network?

This page tells you how dangerous CVE-2026-77274 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-77274 comes with the devices to patch.

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  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.