HighVulnerabilityLLM-specific

CVE-2026-7644: ChatGPTNextWeb NextChat improper authorization in addMcpServer function

Source: NVD(opens in a new tab)
Identifier: CVE-2026-7644
Published: May 2, 2026
Record updated: October 9, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.
EPSS: 0.3%

Summary

A vulnerability in ChatGPTNextWeb NextChat up to 2.16.1 involves the function addMcpServer in app/mcp/actions.ts, classified as improper authorization (CWE-285) and incorrect privilege assignment (CWE-266). Remote exploitation is possible without privileges or user interaction, and the exploit has been publicly disclosed. The project was informed through an issue report but had not responded yet.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 7.3(high)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: none
EPSS: 0.3%Estimated probability that this CVE is exploited in the next 30 days, from the FIRST Exploit Prediction Scoring System. Read on November 9, 2026.
Disclosure date: May 2, 2026

Weaknesses and techniques

Weakness (CWE): CWE-266
CWE-285

Classification

Attack type: Other
Attack sophistication: Trivial
AI component targeted: Plugin
Impact: Integrity,
Confidentiality
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-7644

First tracked: May 2, 2026 at 02:07 PM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Summary

Mitigation

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