Detections
Analytics

SCA: security update for mcp-atlassian (GHSA-7r34-79r5-rcc9)

high Tenable Self-Hosted Container Security Plugin ID 438617

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior
 to version 0.17.0, an unauthenticated attacker who can reach the mcp-atlassian HTTP endpoint can force the
 server process to make outbound HTTP requests to an arbitrary attacker-controlled URL by supplying two
 custom HTTP headers without an `Authorization` header. No authentication is required. The vulnerability
 exists in the HTTP middleware and dependency injection layer — not in any MCP tool handler - making it
 invisible to tool-level code analysis. In cloud deployments, this could enable theft of IAM role
 credentials via the instance metadata endpoint (`169[.]254[.]169[.]254`). In any HTTP deployment it
 enables internal network reconnaissance and injection of attacker-controlled content into LLM tool
 results. Version 0.17.0 fixes the issue. (CVE-2026-27826)

Solution

Update the mcp-atlassian library and its related packages to version 0.17.0 or later.

See Also

https://github.com/advisories/GHSA-7r34-79r5-rcc9

Plugin Details

Severity: High

ID: 438617

Version: Revision 1.13

Type: Local

Family: SCA Checks

Published: 3/11/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 6.6

Percentile: 96.93

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5.3

Vector: CVSS2#AV:A/AC:L/Au:N/C:C/I:P/A:N

CVSS Score Source: CVE-2026-27826

CVSS v3

Risk Factor: High

Base Score: 8.2

Temporal Score: 7.4

Vector: CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 3/10/2026

Vulnerability Publication Date: 3/10/2026

Reference Information

CVE: CVE-2026-27826

cwe: CWE-918