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CVE

CVE-2026-77254

MCP Atlassian: Unauthenticated HTTP MCP requests can use globally configured Jira and Confluence credentials
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CVE

CVE-2026-77254

MCP Atlassian: Unauthenticated HTTP MCP requests can use globally configured Jira and Confluence credentials

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, requests to the HTTP MCP endpoint without a per-user identity are allowed to reach tool handlers, which then use globally configured Jira or Confluence credentials. A network caller can perform operations with the operator account's permissions unless the deployment has an independent authentication boundary. The advisory traces the vulnerable input and processing flow through streamable-http, UserTokenMiddleware, getfetcher, and global credentials, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
C
H
U
9.1
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Related Resources

No items found.

References

https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/77xxx/CVE-2026-77254.json, https://github.com/sooperset/mcp-atlassian/security/advisories/GHSA-vc8m-84rp-53hx, https://nvd.nist.gov/vuln/detail/CVE-2026-77254, https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460, https://github.com/sooperset/mcp-atlassian/pull/1448

Severity

9.1

CVSS Score
0
10

Basic Information

Base CVSS
9.1
EPSS Probability
0.0062%
EPSS Percentile
0.48688%
Introduced Version
0,0.11.0,0.12.0,0.21.0
Fix Available
b041733473f95119dd539542a43c280737a8e460,0.22.0

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