Intel

CVE-2026-77249

mcp-atlassian: Server-Side Request Forgery (SSRF) (CVE-2026-77249)

mediumEPSS 0.3%

Description

MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, JiraUserMixin._lookup_user_by_permissions uses the module-level requests.get function instead of the fetcher's protected session. A caller-controlled public Jira URL can redirect that unhooked request to an internal address, bypassing the redirect checks added for CVE-2026-27826. The advisory traces the vulnerable input and processing flow through JiraUserMixin._lookup_user_by_permissions, requests.get, self.jira._session.get, and _make_ssrf_safe_hook, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Source: OSV (Open Source Vulnerabilities)NVD (NIST)cvelistv5GitHub Security Advisories

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

pypimcp-atlassian
0.10.00.10.10.10.20.10.30.10.40.10.50.10.60.1.10.1.100.11.00.1.110.11.10.11.100.11.110.11.120.1.120.11.20.11.2a20.1.130.11.30.1.140.11.40.1.150.11.50.1.160.11.60.11.70.11.80.11.90.1.20.12.00.1.30.13.00.13.10.1.40.14.00.14.10.14.20.14.30.15.00.1.60.16.00.16.10.1.70.17.00.1.80.18.00.18.1

Metrics

XIEM Effective CVSS
5.3
Source: cna-v3
EPSS percentile
23.2 %
Elevated — this CVE ranks above at least 10% of all CVEs scored today.
KEV status
—
Show all metrics
Severity
medium
Priority score
60.82
Exploit maturity
no public PoC known
CVSS v3
5.3
EPSS score
0.3 %
Low — model estimates < 1% exploitation likelihood.
Published
2026-10-01 16:38 UTC
CWE
CWE-918

Weakness classes (CWE)

  • CWE-918Base

    Server-Side Request Forgery (SSRF)

    The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.

    cwe.mitre.org →

References & sources

Reanalysis & status changes

Chronological NVD audit events for this CVE — reanalyses, CVSS updates, CPE diffs.

  1. Initial Analysis2026-09-29 18:59 UTC· nvd@nist.gov
    • CPE Configuration: OR *cpe:2.3:a:mcp-atlassian:mcp_atlassian:*:*:*:*:*:*:*:* versions up to (excluding) 0.22.0
    • Reference Type: GitHub, Inc.: https://github.com/sooperset/mcp-atlassian/commit/b041733473f95119dd539542a43c280737a8e460 Types: Patch
    • Reference Type: GitHub, Inc.: https://github.com/sooperset/mcp-atlassian/pull/1448 Types: Issue Tracking, Patch
    • Reference Type: GitHub, Inc.: https://github.com/sooperset/mcp-atlassian/releases/tag/v0.22.0 Types: Release Notes
  2. CVE Modified2026-09-22 20:17 UTC· 134c704f-9b21-4f2e-91b3-4a467353bcc0
    • SSVC: {"id":"CVE-2026-77249","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"yes"},{"technical…
  3. New CVE Received2026-09-22 19:16 UTC· security-advisories@github.com
    • Description: MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, JiraUserMixin._lookup_user_by_permissions uses the module-level requests.get function instead of the fetcher's protected session. A caller-controlled public Jira URL can redirect that unhooked request to an internal address, bypassing the redirect checks added for CVE-2026-27826. The advisory traces the vulnerable input and processing flow through JiraUserMixin._lookup_user_by_permissions, requests.get, self.jira._session.get, and _make_ssrf_safe_hook, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.
    • CVSS V3.1: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
    • CWE: CWE-918
    • Affected: New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/77xxx/CVE-2026-77249.json">CVE-2026-77249</a>