CVE-2026-77271 MCP Atlassian - Code Injection

MCP Atlassian < 0.22.0 contains a code injection vulnerability caused by insecure default base directory in validate_safe_path allowing attacker-selected writes in working directory, letting attackers achieve code execution when the application imports the modified module, exploit requires ability to write files in working directory.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
EPSS
0.53% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Code Injection
Impact
Remote Code Execution
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-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

← All CVEs