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CVE-2026-77253— MCP Atlassian: Jira and Confluence attachment upload tools can read arbitrary server-local files

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 是面向 Atlassian 产品（Confluence 和 Jira）的模型上下文协议（MCP）服务器。在版本 0.22.0 之前，Jira 和 Confluence 的附件上传工具允许传入任意的本地文件系统路径，并将所选字节发送至 Atlassian 平台。在 HTTP 或多用户部署环境中，调用者可以跨越客户端到服务器的文件系统边界，从而泄露配置文件、凭证、挂载的密钥或其他 MCP 进程可读的文件。该安全公告追踪了受影响的路径，包括 jira_upload_attachment、con

CVSS 7.1 · High EPSS 0.44% · P39

Affected Version Matrix 1

VendorProduct Version RangeStatus
sooperset mcp-atlassian < 0.22.0 affected
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I. Basic Information for CVE-2026-77253

Vulnerability Information
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Vulnerability Title
MCP Atlassian: Jira and Confluence attachment upload tools can read arbitrary server-local files
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, Jira and Confluence attachment upload tools accept arbitrary local filesystem paths and send the selected bytes to Atlassian. In HTTP or multi-user deployments, a caller can cross the client-to-server filesystem boundary and disclose configuration, credentials, mounted secrets, or other files readable by the MCP process. The advisory traces the vulnerable input and processing flow through jira_upload_attachment, confluence_upload_attachment, file_path, and server-local filesystem, 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:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
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-2026-77253

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III. Intelligence Information for CVE-2026-77253

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Patches & Fixes for CVE-2026-77253 (1)

Vendor Pages for CVE-2026-77253 (1)

Other References for CVE-2026-77253 (1)

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

CVE-2026-77244 10.0 CRITICAL [mcp-atlassian] Authentication bypass in HTTP transport: AtlassianOpaqueTokenVerifier acce
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-2026-77261 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-22