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Back to active CVEs
Medium · CVSS 4.9CVE-2026-42876

External Secrets Operator: Privilege escalation with secret overwritingCVE-2026-42876

Answer in brief

CVE-2026-42876 records a Medium severity (CVSS 4.9) vulnerability in External Secrets Operator: Privilege escalation with secret overwriting. The current sources do not mark it as known exploited. The current feed maps external-secrets/external-secrets (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 May 11, 2026Updated Oct 6, 2026Source checked Oct 6, 2026First seen by HOL Oct 6, 2026Material review Oct 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.9
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 4.9. 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 external-secrets/external-secrets (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
external-secrets/external-secretsgeneric<2.4.12.4.1

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for external-secrets/external-secrets.
  2. 2Review the reported fix. Update external-secrets/external-secrets to 2.4.1 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    May 11, 2026

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

  2. Source modified

    Oct 6, 2026

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

  3. First seen by HOL

    Oct 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

External Secrets Operator reads information from a third-party service and automatically injects the values as Kubernetes Secrets. Prior to 2.4.1, a user who only has permission to create ExternalSecret resources can cause the operator to create a Secret that Kubernetes will automatically populate with a long-lived token for the specified service account. This effectively allows the user to impersonate any service account in the namespace without needing direct create permissions on TokenRequest or Secrets of that type. This vulnerability is fixed in 2.4.1.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • External Secrets Operator: label enforcement bypass in webhook generator enables secret exfiltrationSame external-secrets/external-secrets package
  • Denial-of-service vulnerability in ESET PROTECT On-PremSame generic ecosystem
  • HortusFox < 6.2 Remote Code Execution via Theme ImportSame generic ecosystem
  • SPIP Crayons Plugin < 3.5.0 Authorization Bypass RCESame generic ecosystem
  • MCP TypeScript SDK: OAuth client could send credentials to an authorization server chosen by the MCP serverSame generic ecosystem
  • Kiota: Code injection through doc-comment delimiter reformation in Kiota Java and PHP generatorsSame generic ecosystem

Record context

Vulnerability class
Privilege Escalation
EPSS
Not reported
CWE IDs
CWE-285
Source
CVE List V5
Source checked
Oct 6, 2026
References
3 linked sources
Open source record