CVE-2026-77261 MCP Atlassian - Server Side Request Forgery

MCP Atlassian < 0.22.0 contains a server side request forgery caused by omission of _make_ssrf_safe_hook in JiraFetcher and ConfluenceFetcher sessions, letting attackers follow redirects to internal addresses without revalidation, exploit requires attacker-controlled or compromised Atlassian instance.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
EPSS
0.32% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Server Side Request Forgery
Impact
Server Side Request Forgery
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-918

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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