CVE-2026-93991

HIGHPre-NVD 7.77.7—
EchelonGraph scoreHIGH confidence

Score 7.7 from GitHub Security Advisory (severity: HIGH) published 2026-09-20. a secondary CVSS source baseline 7.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
7.7EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.7Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Argo Workflows versions 4.1.0 through 4.1.3 contain an authorization bypass vulnerability in ListArchivedWorkflows that fails to apply cluster-scoped access review when the metadata.namespace field selector uses the NotEquals operator. Attackers with namespace-scoped list permissions can use a negated namespace field selector to retrieve archived workflows from all other namespaces, exposing spec arguments, parameter values, and annotations.

CVSS v3
7.7
EG Score
7.7(high)
EG Risk
39(Track)
EG Risk 39/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity77% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
26%
KEV
Not listed

Published

September 19, 2026

Last Modified

September 19, 2026

Advisory Details (4)

Auto-updated Sep 19, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
generic

GitHub - argoproj/argo-workflows: Workflow Engine for Kubernetes · GitHub

https://github.com/argoproj/argo-workflows
github_release Patch Available

v4.1.4

Patch available: argoproj/argo-workflows v4.1.4

https://github.com/argoproj/argo-workflows/releases/tag/v4.1.4
github_commit

commit a40972386c09 (argoproj/argo-workflows)

Fix landed in argoproj/argo-workflows commit a40972386c09 — awaiting tagged release

https://github.com/argoproj/argo-workflows/commit/a40972386c097ddf816d2e60e13f058bedca53d9
github Patch Available🟡 PoC Available

Cross-Namespace IDOR in ListArchivedWorkflows via metadata.namespace!= Field Selector Bypass of NamespaceFilter SAR · Advisory · argoproj/argo-workflows · GitHub

Affected: v4.1.4.

https://github.com/argoproj/argo-workflows/security/advisories/GHSA-q65w-j2vp-47c4

Vendor Advisories for CVE-2026-93991(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 8× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-21 00:51 UTCEG score recompute
  2. 2026-09-21 00:51 UTCGHSA enrichment
  3. 2026-09-20 20:16 UTCEPSS rescore
  4. 2026-09-20 12:09 UTCEG score recompute
  5. 2026-09-20 12:09 UTCGHSA enrichment
  6. 2026-09-19 23:27 UTCEG score recompute
  7. 2026-09-19 23:00 UTCEG score recompute
  8. 2026-09-19 23:00 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-93991?
CVE-2026-93991 is a high vulnerability published on September 19, 2026. Argo Workflows versions 4.1.0 through 4.1.3 contain an authorization bypass vulnerability in ListArchivedWorkflows that fails to apply cluster-scoped access review when the metadata.namespace field selector uses the NotEquals operator. Attackers with namespace-scoped list permissions can use a…
When was CVE-2026-93991 disclosed?
CVE-2026-93991 was first published in the National Vulnerability Database on September 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-93991 actively exploited?
CVE-2026-93991 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 74.1% of all scored CVEs.
What is the CVSS score of CVE-2026-93991?
CVE-2026-93991 has a CVSS v3 base score of 7.7 (NVD).
How do I remediate CVE-2026-93991?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-93991, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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