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CVE Record

CVE-2026-23960: Argo Workflows affected by stored XSS in the artifact directory listing

Argo Workflows is an open source container-native workflow engine for orchestrating parallel jobs on Kubernetes. Prior to versions 3.6.17 and 3.7.8, stored XSS in the artifact directory listing allows any workflow author to execute arbitrary JavaScript in another user’s browser under the Argo Server origin, enabling API actions with the victim’s privileges. Versions 3.6.17 and 3.7.8 fix the issue.

HighCVSS 7.3Not KEV-listedUpdated
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Glexia's TakeAutomated analysishigh

Security readout for executives and security teams

Plain-English summary

Argo Workflows has a stored cross-site scripting flaw in artifact directory listings. A workflow author could cause another Argo Server user’s browser to run attacker-controlled JavaScript, potentially making API actions as that user. Fixed versions are 3.6.17 and 3.7.8.

Executive priority

Prioritize remediation for shared or production Argo Workflows deployments. This is not reported as actively exploited in the provided sources, but it can cross privilege boundaries inside Argo Server when users with different roles interact with workflow artifacts.

Technical view

CVE-2026-23960 is CWE-79 stored XSS in Argo Workflows artifact directory listing. The issue affects versions before 3.6.17 and 3.7.0 through before 3.7.8. The CVSS 4.0 score is 7.3, with low privileges required and user interaction required.

Likely exposure

Organizations running Argo Workflows on Kubernetes are exposed if Argo Server uses affected versions, especially shared deployments where workflow authors and artifact viewers have different privilege levels. The main risk is authenticated, lower-privileged authors influencing higher-privileged users’ browser sessions.

Exploitation context

The source bundle does not show CISA KEV listing or confirmed active exploitation. Exploitation requires a workflow author and a victim user viewing the affected artifact directory listing. The impact may include API actions under the victim’s Argo Server privileges.

Researcher notes

Focus validation on artifact directory listing rendering, version state, and trust boundaries between workflow authors and artifact viewers. Avoid assuming unauthenticated exposure: the CVSS vector includes PR:L and UI:A. The public sources identify fixed versions but do not provide broader workaround details.

Mitigation direction

  • Upgrade Argo Workflows to 3.6.17 or 3.7.8 as applicable.
  • Check the GitHub advisory and release notes for vendor guidance.
  • Limit workflow author permissions to trusted users until upgraded.
  • Restrict Argo Server access where mixed-trust users share the same deployment.
  • Review RBAC so browser-session misuse has limited operational impact.

Validation and detection

  • Inventory all Argo Workflows deployments and record exact versions.
  • Confirm no deployment is below 3.6.17 or in 3.7.0 through 3.7.7.
  • Identify users allowed to create workflows in each environment.
  • Identify users who can browse artifact directory listings.
  • Review Argo Server authentication and authorization boundaries.
Prepared
Confidence
high
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cwe · medium confidence lookup

CWE-79: User-session and phishing behavior lookup

Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.

Open ATT&CK lookup
description · low confidence lookup

Container behavior lookup

The affected technology mentions containers, so container-specific ATT&CK technique review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.

Open ATT&CK lookup
cve · low confidence lookup

CVE-2026-23960 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

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Vulnerability profileCVE Program record
Severity
High
CVSS
7.3 (4.0)
Known Exploited
No
Published

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

2CVSS vectors
5Timeline events
2ADP providers
9Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: total

CVSS vector scores

2 official scores

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
7.3CVSS 4.0HighCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——GitHub_M
7.1CVSS 3.1HighCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H1.25.9redhat-SADP

Vulnerability scoring details

Base CVSS 4.0 score

7.3High
CVSS 4.0 vector shape for CVE-2026-23960Attack VectorAttack ComplexityAttack RequirementsPrivileges RequiredUser InteractionVS ConfidentialityVS IntegrityVS AvailabilitySS ConfidentialitySS IntegritySS Availability

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Attack Requirements
NonePresent
Privileges Required
NoneLowHigh
User Interaction
NonePassiveActive
VS Confidentiality
HighLowNone
VS Integrity
HighLowNone
VS Availability
HighLowNone
SS Confidentiality
HighLowNone
SS Integrity
HighLowNone
SS Availability
HighLowNone

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. ADP timelineredhat-SADP

    Made public.

  3. CVE publishedCVE Program

    The CVE record was published.

  4. ADP timelineredhat-SADP

    Reported to Red Hat.

  5. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
redhat-SADPargo-workflows: Argo Workflows: Privilege escalation and information disclosure via stored Cross-Site Scripting (XSS)
other:Red Hat severity ratingcvssV3_1
  • 2026-01-21T23:01:15.692Z: Reported to Red Hat.
  • 2026-01-21T22:02:50.491Z: Made public.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
argoprojargo-workflows< 3.6.17, >= 3.7.0, < 3.7.8Listed
Weakness

CWE details

CWE-79

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.

CWE-79 · source CWE mapping

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.

Open CWE intelligenceSame-CWE CVEs