What is CVE-2021-23135?

CVE-2021-23135 is a medium-severity vulnerability in Argo Cd, classified under Exposure of Sensitive System Information to an Unauthorized Control Sphere. CVSS score: 5.9/10. Published 2021-05-12.

How severe is CVE-2021-23135?

Medium severity. CVSS v3 base score is 5.9 out of 10.

Information disclosure in Argo Cd

CVE-2021-23135

Exposure of System Data to an Unauthorized Control Sphere vulnerability in web UI of Argo CD allows attacker to cause leaked secret data into web UI error messages and logs. This issue affects Argo CD 1.8 versions prior to 1.8.7; 1.7 versions prior to 1.7.14.

Published 2021-05-12 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (12.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 13th percentile — 12.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Argo Cd — versions 1.8, 1.7
Argoproj Argo Cd

Weakness classification (CWE)

References

github.com/argoproj/argo-cd/security/advisories/GHSA-fp89-h8pj-8894 (Third Party Advisory)

Frequently asked questions

What is CVE-2021-23135?: CVE-2021-23135 is a medium-severity vulnerability in Argo Cd, classified under Exposure of Sensitive System Information to an Unauthorized Control Sphere. CVSS score: 5.9/10. Published 2021-05-12.
How severe is CVE-2021-23135?: Medium severity. CVSS v3 base score is 5.9 out of 10.