CVE-2026-77243 MCP Atlassian - Broken Access Control

MCP Atlassian < 0.22.0 contains a broken access control vulnerability caused by improper rechecking of ENABLED_TOOLS and TOOLSETS during tools/call requests, letting clients invoke excluded read, write, or delete tools despite least-privilege restrictions, exploit requires knowledge of hidden tool names.

CVSS base score 8.8 /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
Broken Access Control
Impact
Broken Access Control, Data Tampering, Information Disclosure
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
22 September 2026
Updated
15 October 2026
Weakness
CWE-862

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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