VulnSocial

CVE-2026-6388Disclosure

LOWCVSS 9.1 · CRITICAL

Signal is active with 3 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD description

A flaw was found in ArgoCD Image Updater. This vulnerability allows an attacker, with permissions to create or modify an ImageUpdater resource in a multi-tenant environment, to bypass namespace boundaries. By exploiting insufficient validation, the attacker can trigger unauthorized image updates on applications managed by other tenants. This leads to cross-namespace privilege escalation, impacting application integrity through unauthorized application updates.

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-1220

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 4 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 4 signals
  • Disclosure: 4 classified signals
  • Peaked at 3 mentions on most recent observed day (2026-04-16)
  • 4 total mentions across 2 days

Deep dive

Activity timeline4 mentions / 2d
01223Mentions · 2026-04-15: 1Mentions · 2026-04-16: 3Patch / Workaround · 2026-04-16: 1Technical Details · 2026-04-15: 1Technical Details · 2026-04-16: 304-1504-16
Signal classification1 categories
Disclosure
4100.0%
Referenced assets3 URLs
Classification over time
DateTotalLabels
2026-04-151
Disclosure1
2026-04-163
Disclosure3
Full discourse4 posts
  • Upwind Security MDR@UpwindMDR
    Disclosure

    🚨Critical - ArgoCD Image Updater flaw - privilege escalation (CVE-2026-6388) Attackers with access to ImageUpdater resources can bypass namespace boundaries in multi-tenant setups, triggering cross-tenant image updates. 👉 No fix yet - enforce strict AppProject isolation & restrict access.

    Post summary

    The post announces CVE-2026-6388 as a critical privilege‑escalation flaw in ArgoCD Image Updater, noting the lack of a patch yet and recommending isolation and restricted access as a workaround.

    01080190
    223 followersView on X
  • 0day Signal@0dayPublishing
    Disclosure

    🚨 CVE-2026-6388: Argocd-image-updater: argocd imag... Multi-tenant ArgoCD deployments just became single-tenant nightmares - insufficient namespace validation lets attackers ... https://zerodaysignal.com/vulnerability/CVE-2026-6388 #netsec #vulnerability #CVE #sysadmin #zeroday

    Post summary

    The post alerts about CVE-2026-6388 affecting Argocd-image-updater, noting an insufficient namespace validation flaw that could allow attackers. A link to a vulnerability page is provided but no PoC, patch, or evidence of active exploitation is mentioned.

    0001193
    218 followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-6388 Cross-Namespace Privilege Escalation in ArgoCD Image Updater via Insufficient Validation https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-6388

    Post summary

    A brief disclosure notes a CVE‑2026‑6388 cross‑namespace privilege escalation flaw in ArgoCD Image Updater caused by insufficient validation, with no PoC, exploit code, or patch information provided.

    0000048
    4.0K followersView on X
  • CVE@CVEnew
    Disclosure

    CVE-2026-6388 A flaw was found in ArgoCD Image Updater. This vulnerability allows an attacker, with permissions to create or modify an ImageUpdater resource in a multi-tenant environ… https://www.cve.org/CVERecord?id=CVE-2026-6388

    Post summary

    The tweet announces CVE‑2026‑6388 as a flaw in ArgoCD Image Updater, explaining that attackers can modify ImageUpdater resources in multi‑tenant setups, but it offers no PoC, exploit code, patch, or evidence of active exploitation.

    0000093
    57.2K followersView on X

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