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Fencer Vulns
medium 6.4

CVE-2023-5135 json

Simple Cloudflare Turnstile <= 1.23.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode

published 2023-09-26 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-57473

cvss
6.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 55%
public exploits
0
none known

Summary

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.

Patch / fix

  • replywp simple_cloudfare_turnstile 1.23.2

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

0.74% chance of exploitation in the next 30 days, higher than 55% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-cloudflare-turnstile/tags/1.23.0/inc/integrations/forms/gravity-forms.php#L14 referenced PoC, tagged "exploit" by a source, unverified
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-cloudflare-turnstile/tags/1.23.0/inc/integrations/forms/gravity-forms.php#L23 referenced PoC, tagged "exploit" by a source, unverified
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/simple-cloudflare-turnstile/tags/1.23.0/simple-cloudflare-turnstile.php#L72 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 6.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
NVD 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

  • elliotvs Simple CAPTCHA Alternative with Cloudflare Turnstile

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation
Technology feeds

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.