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Back to active CVEs
High · CVSS 7.5CVE-2026-120807

Privilege escalation via fail-open user lookup in X.509 cluster-membership guardCVE-2026-120807

Answer in brief

CVE-2026-120807 records a High severity (CVSS 7.5) vulnerability in Privilege escalation via fail-open user lookup in X.509 cluster-membership guard. The current sources do not mark it as known exploited. The current feed maps MongoDB/MongoDB Server (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Nov 10, 2026Updated Nov 10, 2026Source checked Nov 10, 2026First seen by HOL Nov 10, 2026Material review Nov 10, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.5
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps MongoDB/MongoDB Server (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
MongoDB/MongoDB Servergeneric>=9.0.0 <9.0.7 || >=8.3.0 <8.3.16 || >=8.0.0 <8.0.37 || >=7.0.0 <7.0.489.0.7, 8.3.16, 8.0.37, 7.0.48

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for MongoDB/MongoDB Server.
  2. 2Review the reported fix. Update MongoDB/MongoDB Server to 9.0.7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Nov 10, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Nov 10, 2026

Sources and claim methodology

  • Source referencejira.mongodb.org
Upstream source description

A flaw in MongoDB’s X.509 cluster-membership authentication guard could allow a holder of a cluster-member certificate to gain elevated internal privileges when a specific deployment configuration is in use. An internal check, which prevents a certificate recognized as a cluster member from also being treated as a regular user, does not correctly distinguish between certain error conditions encountered during user lookup. Under certain timing conditions, this can cause the check to be bypassed, granting the connection full internal system privileges. Triggering this issue requires possession of a valid cluster-member TLS certificate, non-default X.509 cluster authentication configuration, and specific conditions during the user cache lookup process.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-754
Source
CVE List V5
Source checked
Nov 10, 2026
References
1 linked source
Open source record