Is CVE-2021-24228 in the CISA KEV catalog?

No. CVE-2021-24228 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-24228?

CVE-2021-24228 has a CVSS v3 base score of 9.6 (CRITICAL).

What is the EPSS score for CVE-2021-24228?

CVE-2021-24228 has an EPSS score of 1.87% (77th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-24228?

Upgrade patreon wordpress to 1.7.2 or later.

CVE & CISA-KEV Catalog

CVE-2021-24228

CRITICALEPSS 77th pctl

9.6

CVSS v3

NVD

Description

The Jetpack Scan team identified a Reflected Cross-Site Scripting in the Login Form of the Patreon WordPress plugin before 1.7.2. The WordPress login form (wp-login.php) is hooked by the plugin and offers to allow users to authenticate on the site using their Patreon account. Unfortunately, some of the error logging logic behind the scene allowed user-controlled input to be reflected on the login page, unsanitized.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

patreon wordpressNVD

Affected:< 1.7.2Fixed in:1.7.2CVE-2021-24228derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Exploit Intelligence

1.87%probability of exploitation in 30 days

77thpercentile

Elevated risk: more likely to be exploited than 77% of all known CVEs.

References

Exploit1

jetpack.com

Third-Party Advisory1

wpscan.com

Related Vulnerabilities

Other CWE-79 (Cross-Site Scripting (XSS)) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2020-11022	Medium	6.9	99%	-	Fix
CVE-2019-3929	Critical	9.8	99%	KEV	Fix
CVE-2020-9496	Medium	6.1	99%	-	-
CVE-2023-28341	Medium	6.1	99%	-	Fix
CVE-2018-12998	Medium	6.1	98%	-	-
CVE-2025-4123	High	7.6	98%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.