CVE-2026-77254 MCP Atlassian - Broken Access Control

MCP Atlassian < 0.22.0 contains a broken access control vulnerability caused by allowing requests without per-user identity to use global Jira or Confluence credentials, letting network attackers perform operations with operator permissions, exploit requires lack of independent authentication boundary.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
Proof of concept available
EPSS
0.62% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Broken Access Control
Impact
Broken Access Control
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-306

Vendor fix

Upgrade 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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