CVE-2026-77249 Vulnerability Analysis & Exploit Details

CVE-2026-77249
Vulnerability Scoring

5.3
/10
Significant Risk

Security assessments indicate that CVE-2026-77249 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical access.
  • Privileges Required: None
    No privileges are required for exploitation.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-77249 Details

Status: Analyzed

Last updated: 🕡 29 Sep 2026, 18:59 UTC
Originally published on: 🕖 22 Sep 2026, 19:16 UTC

Time between publication and last update: 6 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVE-2026-77249 Vulnerability Summary

CVE-2026-77249: 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.

Assessing the Risk of CVE-2026-77249

Access Complexity Graph

The exploitability of CVE-2026-77249 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-77249

With low attack complexity and no required privileges, CVE-2026-77249 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-77249, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-77249, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: Low
    CVE-2026-77249 could lead to minor leaks of non-critical information without major privacy breaches.
  • Integrity: None
    CVE-2026-77249 poses no threat to data integrity.
  • Availability: None
    CVE-2026-77249 does not impact system availability.

CVE-2026-77249 References

External References

CWE Common Weakness Enumeration

CWE-918

CAPEC Common Attack Pattern Enumeration and Classification

  • Server Side Request Forgery CAPEC-664 An adversary exploits improper input validation by submitting maliciously crafted input to a target application running on a server, with the goal of forcing the server to make a request either to itself, to web services running in the server’s internal network, or to external third parties. If successful, the adversary’s request will be made with the server’s privilege level, bypassing its authentication controls. This ultimately allows the adversary to access sensitive data, execute commands on the server’s network, and make external requests with the stolen identity of the server. Server Side Request Forgery attacks differ from Cross Site Request Forgery attacks in that they target the server itself, whereas CSRF attacks exploit an insecure user authentication mechanism to perform unauthorized actions on the user's behalf.

Vulnerable Configurations

  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.4:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.4:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.5:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.5:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.6:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.6:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.7:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.7:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.8:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.8:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.9:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.9:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.10:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.10:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.11:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.11:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.12:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.12:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.13:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.13:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.14:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.14:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.15:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.15:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.16:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.1.16:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.2:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.2:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.3:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.3:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.4:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.4:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.5:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.5:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.6:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.2.6:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.3.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.3.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.2:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.2:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.3:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.3:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.4:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.4:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.5:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.6.5:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.2:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.2:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.3:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.3:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.4:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.8.4:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.2:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.2:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.3:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.3:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.4:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.4:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.5:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.5:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.6:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.10.6:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.2:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.2:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.3:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.3:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.4:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.4:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.5:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.5:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.6:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.6:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.7:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.7:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.8:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.8:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.9:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.9:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.10:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.10:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.11:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.11:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.12:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.11.12:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.13.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.13.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.13.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.14.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.14.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.14.2:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.14.2:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.14.3:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.14.3:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.15.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.16.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.16.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.16.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.16.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.18.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.18.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.19.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.19.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.20.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.20.0:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.20.1:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.20.1:*:*:*:*:*:*:*
  • cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.21.0:*:*:*:*:*:*:*
    cpe:2.3:a:mcp-atlassian:mcp_atlassian:0.21.0:*:*:*:*:*:*:*

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