CVE-2026-77250 Vulnerability Analysis & Exploit Details

CVE-2026-77250
Vulnerability Scoring

6.1
/10
High Risk

If left unpatched, CVE-2026-77250 could lead to major system disruptions or data loss.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-77250 Details

Status: Analyzed

Last updated: 🕑 29 Sep 2026, 14:22 UTC
Originally published on: 🕕 22 Sep 2026, 18:17 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:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

CVE-2026-77250 Vulnerability Summary

CVE-2026-77250: MCP Atlassian is a Model Context Protocol (MCP) server for Atlassian products (Confluence and Jira). Prior to 0.22.0, OAuthConfig writes a plaintext fallback file containing access and refresh tokens under the user's .mcp-atlassian directory using process-default permissions. On systems with a permissive umask, same-group or other local users and processes can read the persisted tokens and reuse the associated Atlassian access. The advisory traces the vulnerable input and processing flow through OAuthConfig._save_tokens, ~/.mcp-atlassian/oauth-<client_id>.json, access_token, and refresh_token, which identify the affected entry points, controls, and code paths. This issue is fixed in version 0.22.0.

Assessing the Risk of CVE-2026-77250

Access Complexity Graph

The exploitability of CVE-2026-77250 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-2026-77250

CVE-2026-77250 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

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-2026-77250, 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-2026-77250, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: High
    Exploiting CVE-2026-77250 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: Low
    Exploiting CVE-2026-77250 may cause minor changes to data without severely impacting its accuracy.
  • Availability: None
    CVE-2026-77250 does not impact system availability.

CVE-2026-77250 References

External References

CWE Common Weakness Enumeration

CWE-312

CAPEC Common Attack Pattern Enumeration and Classification

  • Retrieve Embedded Sensitive Data CAPEC-37 An attacker examines a target system to find sensitive data that has been embedded within it. This information can reveal confidential contents, such as account numbers or individual keys/credentials that can be used as an intermediate step in a larger attack.

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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