CVE-2026-77255 MCP Atlassian - Path Traversal

MCP Atlassian < 0.22.0 contains a path traversal caused by lack of workspace validation in the attachments argument of jira update_issue, letting attackers read arbitrary local files and attach them to Jira issues, exploit requires crafted attachments argument.

CVSS base score 8.6 /10
High
CISA KEV
Not listed
Public exploit
Proof of concept available
Authentication
Not required
EPSS
0.41% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Path Traversal
Impact
File System Read, Information Disclosure
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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