CVE-2026-6388
CRITICALDescription
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.
How to fix
No published remediation has been found for this vulnerability's affected products yet.
Mitigation guidance may be in the linked vendor advisories in the References section below.
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CVSS v3 Vector
Exploitability
Impact
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:L
Exploit Intelligence
Low risk: more likely to be exploited than 28% of all known CVEs.
References
Related Vulnerabilities
Other CWE-1220 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2025-31201 | Critical | 9.8 | 15% | KEV | Fix |
| CVE-2026-33825 | High | 7.8 | 6.7% | KEV + Ransom | Fix |
| CVE-2024-42365 | High | 7.4 | 4.7% | - | Fix |
| CVE-2026-39363 | High | 7.5 | 3.3% | - | Fix |
| CVE-2023-43040 | Medium | 6.5 | 2.5% | - | Fix |
| CVE-2025-4404 | Critical | 9.1 | 2.0% | - | Fix |
Common questions
How do I fix CVE-2026-6388?
No published fix for CVE-2026-6388 has been found yet. Check the linked vendor advisories for guidance as it becomes available.
Is CVE-2026-6388 being actively exploited?
Not that we know of. CVE-2026-6388 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.36% is the estimated probability that it will be exploited in the next 30 days. That is higher than 28% of all scored CVEs.
How severe is CVE-2026-6388?
CVE-2026-6388 has a CVSS v3 base score of 9.1, rated critical. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-15.