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CVE-2026-77244— [mcp-atlassian] Authentication bypass in HTTP transport: AtlassianOpaqueTokenVerifier accepts any non-empty token

Quick assessment

Affected
sooperset mcp-atlassian
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the HTTP transport accepts requests without a verified user identity and downstream fetcher construction falls back to the operator's globally

CVSS 10.0 · Critical

Affected Version Matrix 1

VendorProduct Version RangeStatus
sooperset mcp-atlassian < 0.22.0 affected
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I. Basic Information for CVE-2026-77244

Vulnerability Information

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Vulnerability Title
[mcp-atlassian] Authentication bypass in HTTP transport: AtlassianOpaqueTokenVerifier accepts any non-empty token
Source: CVE Program / CVE List V5
Vulnerability Description
MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, the HTTP transport accepts requests without a verified user identity and downstream fetcher construction falls back to the operator's globally configured Jira or Confluence credentials. A network client that can reach the MCP endpoint can invoke Atlassian tools as the operator, including read and write operations available to that account. The advisory traces the vulnerable input and processing flow through UserTokenMiddleware, AtlassianOpaqueTokenVerifier, _get_fetcher, and streamable-http, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sooperset mcp-atlassian < 0.22.0 -

II. Public POCs for CVE-2026-77244

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III. Intelligence Information for CVE-2026-77244

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Patches & Fixes for CVE-2026-77244 (1)

Vendor Pages for CVE-2026-77244 (1)

Other References for CVE-2026-77244 (1)

Same Patch Batch · sooperset · 2026-09-22 · 29 CVEs total

CVE-2026-77254 9.1 CRITICAL MCP Atlassian: Unauthenticated HTTP MCP requests can use globally configured Jira and Conf
CVE-2026-77274 8.8 HIGH MCP Atlassian: SSRF Protection Bypass
CVE-2026-77243 8.8 HIGH MCP Atlassian: ENABLED_TOOLS / Toolset authorization bypass
CVE-2026-77255 8.6 HIGH MCP Atlassian: Arbitrary File Read & Exfiltration (Confused Deputy) in JIRA update_issue
CVE-2026-77262 8.6 HIGH MCP Atlassian: Path Traversal / Arbitrary File Read in confluence_upload_attachment MCP to
CVE-2026-77248 8.6 HIGH MCP Atlassian: Unauthenticated arbitrary local file read via upload_attachment file_path,
CVE-2026-77247 8.3 HIGH MCP Atlassian: Arbitrary server-local file upload to Jira/Confluence attachments via unres
CVE-2026-77260 8.3 HIGH MCP Atlassian: Arbitrary local file READ via unconstrained file_path in upload_attachment
CVE-2026-77257 8.3 HIGH MCP Atlassian: HTTP upload tools accept arbitrary server-local file paths
CVE-2026-77267 8.3 HIGH mcp-atlassian has an incomplete SSRF remediation
CVE-2026-77271 8.3 HIGH MCP Atlassian: Incomplete path traversal fix allows intra-CWD module overwrite and RCE (by
CVE-2026-77251 8.3 HIGH MCP Atlassian: JIRA_PROJECTS_FILTER / CONFLUENCE_SPACES_FILTER allow forbidden-project con
CVE-2026-77256 8.3 HIGH MCP Atlassian: OAuth refresh-token backup file is world-readable under default Unix umask
CVE-2026-77259 7.7 HIGH MCP Atlassian: Arbitrary file read via confluence_upload_attachment allows exfiltration of
CVE-2026-77258 7.7 HIGH MCP Atlassian: Arbitrary file read/exfiltration via upload_attachment missing validate_saf
CVE-2026-77242 7.5 HIGH MCP Atlassian: Incomplete fix for CVE-2026-27826: DNS rebinding bypasses SSRF validation (
CVE-2026-77246 7.4 HIGH MCP Atlassian: MCP HTTP Client Server-Local File Exfiltration via Unvalidated Attachment U
CVE-2026-77253 7.1 HIGH MCP Atlassian: Jira and Confluence attachment upload tools can read arbitrary server-local
CVE-2026-77261 7.1 HIGH MCP Atlassian: SSRF redirect protection missing for basic-auth and OAuth authentication br
CVE-2026-77269 6.5 MEDIUM MCP Atlassian: Path traversal in upload_attachment allows arbitrary file read (incomplete

Showing top 20 of 29 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: mcp-atlassian
Same vendor: sooperset
Same weakness: CWE-287

V. Comments for CVE-2026-77244

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