What is CVE-2021-23347?

CVE-2021-23347 is a medium-severity vulnerability in Argoproj Argo Cd, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2021-03-03.

How severe is CVE-2021-23347?

Medium severity. CVSS v3 base score is 4.7 out of 10.

XSS in Argoproj Argo Cd

CVE-2021-23347

The package github.com/argoproj/argo-cd/cmd before 1.7.13, from 1.8.0 and before 1.8.6 are vulnerable to Cross-site Scripting (XSS) the SSO provider connected to Argo CD would have to send back a malicious error message containing JavaScript to the user.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-03-03 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L.

EPSS exploit prediction

EPSS: 0.006 (46.3th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 46.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.001

Affected products

Argoproj Argo Cd
Github.com/argoproj/argo-Cd/cmd — versions unspecified, 1.8.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

snyk.io/vuln/SNYK-GOLANG-GITHUBCOMARGOPROJARGOCDCMD-1078291 (Third Party Advisory)
github.com/argoproj/argo-cd/pull/5563 (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2021-23347?: CVE-2021-23347 is a medium-severity vulnerability in Argoproj Argo Cd, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2021-03-03.
How severe is CVE-2021-23347?: Medium severity. CVSS v3 base score is 4.7 out of 10.