Is CVE-2023-5135 in the CISA KEV catalog?

No. CVE-2023-5135 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-5135?

CVE-2023-5135 has a CVSS v3 base score of 6.4 (MEDIUM).

What is the EPSS score for CVE-2023-5135?

CVE-2023-5135 has an EPSS score of 0.64% (46th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-5135?

Upgrade simple cloudfare turnstile to 1.23.2 or later.

CVE & CISA-KEV Catalog

CVE-2023-5135

MEDIUM

6.4

CVSS v3

NVD

Description

The Simple Cloudflare Turnstile plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'gravity-simple-turnstile' shortcode in versions up to, and including, 1.23.1 due to insufficient input sanitization and output escaping on user supplied attributes. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

CWE-79Cross-Site Scripting (XSS)

How to fix

Remediation Available

simple cloudfare turnstileNVD

Affected:< 1.23.2Fixed in:1.23.2CVE-2023-5135derived 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 RequiredLow

User InteractionNone

ScopeChanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

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

Exploit Intelligence

0.64%probability of exploitation in 30 days

46thpercentile

Moderate risk: more likely to be exploited than 46% of all known CVEs.

References

Patch1

plugins.trac.wordpress.org

Exploit3

Third-Party Advisory1

wordfence.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 2026-04-08.