CVE-2026-52869 Vulnerability Analysis & Exploit Details

CVE-2026-52869
Vulnerability Scoring

7.1
/10
Very High Risk

Highly exploitable, CVE-2026-52869 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

  • Attack Complexity: High
    Exploits require significant effort and special conditions.
  • Attack Vector: Network
    Vulnerability is exploitable over a network without physical 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-2026-52869 Details

Status: Analyzed

Last updated: 🕕 17 Jul 2026, 18:06 UTC
Originally published on: 🕗 15 Jul 2026, 20:17 UTC

Time between publication and last update: 1 days

CVSS Release: version 3

CVSS3 Source

security-advisories@github.com

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-52869 Vulnerability Summary

CVE-2026-52869: The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to 1.27.2, the SSE and stateful Streamable HTTP transports mcp.server.sse.SseServerTransport and mcp.server.streamable_http_manager.StreamableHTTPSessionManager route requests to existing sessions using only the session_id query parameter or Mcp-Session-Id header without verifying the authenticated principal that created the session, allowing a different bearer-token-authenticated client with a known session ID to inject JSON-RPC messages into that session. This issue is fixed in version 1.27.2.

Assessing the Risk of CVE-2026-52869

Access Complexity Graph

The exploitability of CVE-2026-52869 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-2026-52869

This vulnerability, CVE-2026-52869, requires a high level of attack complexity and low privileges, making it difficult but not impossible to exploit. Organizations should ensure robust security configurations to mitigate 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-2026-52869, 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-2026-52869, 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-2026-52869 can result in unauthorized access to sensitive data, severely compromising data privacy.
  • Integrity: High
    CVE-2026-52869 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
  • Availability: Low
    CVE-2026-52869 may slightly degrade system performance without fully affecting service availability.

CVE-2026-52869 References

External References

CWE Common Weakness Enumeration

CWE-639

Vulnerable Configurations

  • cpe:2.3:a:lfprojects:mcp_python_sdk:0.2.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:0.2.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:0.3.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:0.3.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:0.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:0.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:0.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:0.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:0.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:0.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:0.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:0.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:0.9.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:0.9.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.0.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.2:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.2:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.3:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.1.3:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.2.0:-:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.2.0:-:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.2.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.2.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.2.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.2.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.3.0:-:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.3.0:-:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.3.0:rc1:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.3.0:rc1:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.4.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.4.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.5.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.5.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.6.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.6.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.7.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.7.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.7.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.7.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.8.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.8.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.8.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.8.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.2:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.2:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.3:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.3:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.4:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.9.4:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.10.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.10.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.10.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.10.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.11.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.11.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.2:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.2:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.3:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.3:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.4:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.12.4:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.13.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.13.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.13.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.13.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.14.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.14.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.14.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.14.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.15.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.15.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.16.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.16.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.17.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.17.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.18.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.18.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.19.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.19.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.20.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.20.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.21.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.21.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.21.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.21.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.21.2:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.21.2:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.22.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.22.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.1:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.2:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.2:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.3:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.23.3:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.24.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.24.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.25.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.25.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.26.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.26.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.27.0:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.27.0:*:*:*:*:*:*:*
  • cpe:2.3:a:lfprojects:mcp_python_sdk:1.27.1:*:*:*:*:*:*:*
    cpe:2.3:a:lfprojects:mcp_python_sdk:1.27.1:*:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2026-52869: Combat Critical CVE Threats

Stay updated with real-time CVE vulnerabilities and take action to secure your systems. Enhance your cybersecurity posture with the latest threat intelligence and mitigation techniques. Develop the skills necessary to defend against CVEs and secure critical infrastructures. Join the top cybersecurity professionals safeguarding today's infrastructures.

Other 5 Recently Published CVEs Vulnerabilities

  • CVE-2026-90555 – vLLM versions before 0.28.0 fail to validate audio sample rate headers in the transcription endpoint, allowing authenticated clients to bypass dura...
  • CVE-2026-90554 – vLLM versions >=0.10.2 and <0.28.0 do not apply any audio decode-size or duration limit when extracting audio from video input for NanoNemotronVL m...
  • CVE-2026-90553 – vLLM before 0.28.0 contains a remote code execution vulnerability in the LlavaOnevision2 processor loader that ignores the trust_remote_code parame...
  • CVE-2026-90552 – WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 fails to validate playlist ownership in the Playlists_schedules/list.json.php a...
  • CVE-2026-90551 – WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 fails to validate playlist ownership in the video_from_program API endpoint, al...