VulnSocial

CVE-2026-77258Patch(mcp-atlassian / mcp_atlassian)

LOWCVSS 7.7 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch mcp-atlassian mcp_atlassian systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, upload_attachment in src/mcp_atlassian/confluence/attachments.py accepts a caller-controlled file_path and opens the selected server-local file without restricting it to the workspace. A permitted Confluence MCP caller can upload the file as an attachment and disclose data readable by the server process. This issue is fixed in version 0.22.0.

mcp-atlassian CVEsBack to dashboard
0.5/ 10 priority

Sources & remediation

Patch / fix
Exploit / PoC references
Other references
Weakness type (CWE)
CWE-22

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • mcp_atlassian

Threat summary

  • Patch or workaround signal is available
  • 1 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 1 signal
  • 1 total mentions across 1 day

Affected systems

Vendors
mcp-atlassian
Products
mcp_atlassian

Deep dive

Activity timeline1 mentions / 1d
00111Mentions · 2026-09-22: 1Patch / Workaround · 2026-09-22: 1Technical Details · 2026-09-22: 109-22
Signal classification1 categories
Patch
1100.0%
Full discourse1 post
  • Anthony Bahn@HoustonIntrove1
    Patch

    If an agent can call Confluence MCP, it can also walk your disk. CVE-2026-77258: upload_attachment accepted any caller path and attached the file. No workspace boundary. Fixed in mcp-atlassian 0.22.0. Check which boxes still run older builds.

    Post summary

    The text details a vulnerability (CVE-2026-77258) in mcp-atlassian where the upload_attachment function bypasses workspace boundaries, and highlights that the issue has been fixed in version 0.22.0.

    0000036
    38 followersView on X
CPE platform detail1 entries

1 of 1 entries

PartVendorProductVersionTarget SWTarget HW
Appmcp-atlassianmcp_atlassian---

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