# CVE-2026-93991 — argoproj argo-workflows

> As of 2026-09-19, CVE-2026-93991 is a HIGH-severity vulnerability in argoproj argo-workflows, CVSS v3.1 7.7, EPSS 0.3% (25.9th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-93991 as of 2026-09-19; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-09-19

## What is CVE-2026-93991?

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.

The record classifies CVE-2026-93991 under weakness class [CWE-639](https://intel.threadlinqs.com/cwe/CWE-639). Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 16 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.7 — HIGH (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N`)
- **CVSS v4.0 base score:** 8.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N`)
- **EPSS (FIRST):** 0.3% probability of exploitation in the next 30 days, higher than 25.9% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-09-19

## Is CVE-2026-93991 being exploited?

It currently carries a trending score of 36 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **argoproj**: argo-workflows

## How to fix CVE-2026-93991

No vendor patch reference has been recorded for CVE-2026-93991 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-93991

No threat campaign in the Threadlinqs corpus currently references CVE-2026-93991, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, FIRST EPSS. Last verified by Threadlinqs on 2026-09-20.

**Vendor advisory and patch**

- [github.com — vendor advisory](https://github.com/argoproj/argo-workflows/security/advisories/GHSA-q65w-j2vp-47c4)
- [github.com — patch](https://github.com/argoproj/argo-workflows/commit/a40972386c097ddf816d2e60e13f058bedca53d9)
- [github.com — release notes](https://github.com/argoproj/argo-workflows/releases/tag/v4.1.4)

**Third-party advisory**

- [vulncheck.com — third party advisory](https://www.vulncheck.com/advisories/argo-workflows-4.1.0-through-4.1.3-cross-namespace-disclosure-via-negated-selector)

**Issue tracking and product pages**

- [github.com — product](https://github.com/argoproj/argo-workflows)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-93991
Full detection coverage and IOCs for threats exploiting CVE-2026-93991 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp