What is CVE-2021-24436?

CVE-2021-24436 is a medium-severity vulnerability in Boldgrid W3 Total Cache, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-19.

How severe is CVE-2021-24436?

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

Is CVE-2021-24436 known to be exploited?

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

XSS in Boldgrid W3 Total Cache

CVE-2021-24436

The W3 Total Cache WordPress plugin before 2.1.4 was vulnerable to a reflected Cross-Site Scripting (XSS) security vulnerability within the "extension" parameter in the Extensions dashboard, which is output in an attribute without being escaped first. This could allow an attacker, who can convince an authenticated admin into clicking a link, to run malicious JavaScript within the user's web browser, which could lead to full site compromise.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.019 (78.6th percentile) — read the EPSS interpretation.

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.

Affected products

Boldgrid W3 Total Cache — versions 2.1.4
Boldgrid W3_total_cache

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

contact@wpscan.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-24436?: CVE-2021-24436 is a medium-severity vulnerability in Boldgrid W3 Total Cache, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2021-07-19.
How severe is CVE-2021-24436?: Medium severity. CVSS v3 base score is 6.1 out of 10.
Is CVE-2021-24436 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.