CVE-2026-42880

Description

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From versions 3.2.0 to before 3.2.11 and 3.3.0 to before 3.3.9, there is a missing authorization and data-masking gap in Argo CD's ServerSideDiff endpoint that allows an attacker with read-only access to extract plaintext Kubernetes Secret data from etcd via the Kubernetes API server's Server-Side Apply dry-run mechanism. This issue has been patched in versions 3.2.11 and 3.3.9.

CVSS v3.1 Score

9.6

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-200 CWE-200

CWE-212 CWE-212

Affected Products

Vendor	Product	Versions
argoproj	argo_cd	3.2.0 — 3.2.11
argoproj	argo_cd	3.3.0 — 3.3.9

References

Advisories & Patches

https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3 https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3

Exploits

https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3 https://github.com/argoproj/argo-cd/security/advisories/GHSA-3v3m-wc6v-x4x3

Frequently Asked Questions

What is CVE-2026-42880? +

Argo CD is a declarative, GitOps continuous delivery tool for Kubernetes. From versions 3.2.0 to before 3.2.11 and 3.3.0 to before 3.3.9, there is a missing authorization and data-masking gap in Argo CD's ServerSideDiff endpoint that allows an attacker with read-only access to extract plaintext Kubernetes Secret data from etcd via the Kubernetes API server's Server-Side Apply dry-run mechanism. This issue has been patched in versions 3.2.11 and 3.3.9. It has a CVSS v3.1 base score of 9.6 (CRITICAL).

How severe is CVE-2026-42880? +

CVE-2026-42880 has a CVSS v3.1 score of 9.6 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-42880? +

CVE-2026-42880 affects products from argoproj, specifically: argo_cd. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-42880? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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