CVE-2026-77248 MCP Atlassian - Broken Access Control

MCP Atlassian < 0.22.0 contains a broken access control caused by accepting requests without user identity and unrestricted file_path in upload_attachment, letting unauthenticated attackers read and upload files to Jira or Confluence, exploit requires network access without authentication.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.41% chance of exploitation in 30 days
View the NVD record ↗

Details

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

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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