What is CVE-2021-26924?

CVE-2021-26924 is a medium-severity vulnerability in Argoproj Argo Cd, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-03-15.

How severe is CVE-2021-26924?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Argoproj Argo Cd

CVE-2021-26924

An issue was discovered in Argo CD before 1.8.4. Browser XSS protection is not activated due to the missing XSS protection header.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-03-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.6th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 51.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Argoproj Argo Cd

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/argoproj/argo-cd/compare/v1.8.3...v1.8.4 (Patch, Third Party Advisory)
github.com/argoproj/argo-cd/security/advisories/GHSA-pg99-h5gc-446r (Third Party Advisory)

Frequently asked questions

What is CVE-2021-26924?: CVE-2021-26924 is a medium-severity vulnerability in Argoproj Argo Cd, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-03-15.
How severe is CVE-2021-26924?: Medium severity. CVSS v3 base score is 6.1 out of 10.