CVE-2026-77242 MCP Atlassian - Server Side Request Forgery

MCP Atlassian < 0.22.0 contains a server-side request forgery caused by inconsistent DNS resolution in validate_url_for_ssrf and connection libraries, letting unauthenticated attackers access internal or metadata endpoints, exploit requires crafted URL with short-lived DNS.

CVSS base score 7.5 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.30% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server Side Request Forgery
Impact
Server Side Request Forgery, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-367

Vendor fix

Update to version 0.22.0 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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