What is CVE-2021-24409?

CVE-2021-24409 is a medium-severity vulnerability in Jeff Starr Prismatic, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-12.

How severe is CVE-2021-24409?

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

Is CVE-2021-24409 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Jeff Starr Prismatic

CVE-2021-24409

The Prismatic WordPress plugin before 2.8 does not escape the 'tab' GET parameter before outputting it back in an attribute, leading to a reflected Cross-Site Scripting issue which will be executed in the context of a logged in administrator

Vulnerability class: XSS (Cross-Site Scripting)

Published 2021-07-12 · 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: 0.017 (76.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.017 · change: -0.001

Affected products

Jeff Starr Prismatic — versions 2.8
Plugin-Planet Prismatic

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

20142995/nuclei-templates

References

wpscan.com/vulnerability/ae3cd3ed-aecd-4d8c-8a2b-2936aaaef0cf (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-24409?: CVE-2021-24409 is a medium-severity vulnerability in Jeff Starr Prismatic, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-12.
How severe is CVE-2021-24409?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-24409 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.