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Public proof of conceptAwaiting NVD analysis

CVE-2026-90898

A public proof of concept exists; no exploitation attested.

  • Published2026-09-14
  • WeaknessCWE-284 · CWE-306

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Bifrost registers MCP clients through its management API. A stdio client is a command plus args. Bifrost starts that program in the gateway the moment the client is added. No MCP handshake required. The default is governance.auth_config.is_enabled=false. Auth off means every caller is a local admin. One unauthenticated POST /api/mcp/client is enough to run a program as the Bifrost process user (appuser on the official image).  transports/v2.1.0 refuses an unauthenticated stdio registration with 403. transports/v2.0.0 still allows it.

Timeline

dates in UTC
  1. 2026-09-1411:17CVE publishedNVD

Versions per branch

Products declared by the CNA

As JFROG, the CNA that assigned this CVE, declared them in the CVE record; versions as written. NVD lists no product for this CVE yet: this is the only product data so far.

  • maximhq Bifrostother versions: not affected

    package github.com/maximhq/bifrost/transportshttps://github.com/maximhq/bifrostplatforms: Linux, macOS

    Affected
    • < 2.1.0fixed in 2.1.0semver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-09-14

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2026-90898 yet.

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

read 2026-11-01 01:02 UTC
Nuclei template
available
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2026-09-14
Last Modified
2026-09-18
NVD status
Awaiting Analysis
GitHub Advisory
GHSA-gqjq-cgxr-8c7c

Frequently asked questions

What is CVE-2026-90898?

Bifrost registers MCP clients through its management API. A stdio client is a command plus args. Bifrost starts that program in the gateway the moment the client is added. No MCP handshake required. The default is governance.auth_config.is_enabled=false. Auth off means every caller is a local admin. One unauthenticated POST /api/mcp/client is enough to run a program as the Bifrost process user (appuser on the official image).  transports/v2.1.0 refuses an unauthenticated stdio registration with 403. transports/v2.0.0 still allows it.

Is CVE-2026-90898 actively exploited?

Active exploitation of CVE-2026-90898 has not been confirmed. Its EPSS score was 2.3% on 2026-11-12, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-90898?

CVE-2026-90898 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record