MCP Atlassian: Path Traversal / Arbitrary File Read in confluence_upload_attachment MCP tool (incomplete fix of CVE-2026-27825)
41Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 8.6epss 0.5%
from disclosure to weapon0 days
Published on NVDSep 22
1st PoCApr 29
exploitation probability
0.5%top 57% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, confluence_upload_attachment accepts an attacker-controlled file_path and does not apply the path restriction added for the earlier download vulnerability. A caller can traverse outside the workspace and upload arbitrary server-readable files to Confluence. The advisory traces the vulnerable input and processing flow through confluence_upload_attachment, file_path, and CVE-2026-27825, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Affected products
sooperset · mcp-atlassianpublic PoCs found — 1
githubgithub.com/romain-deperne/CVE-2026-77262★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.