CVE-2026-15239: unknown simple captcha with cloudflare turnstile
Vulnerability summary
CVE-2026-15239 is a medium (CVSS 5.3) vulnerability in unknown simple captcha with cloudflare turnstile. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.5% of scored vulnerabilities. 1 public exploit is recorded. Fixed in 1.42.0.
Timeline
- 07-08-2026PublishedVulnerability first disclosed.
- 07-08-2026Last modifiedVulnerability information updated.
Description
The Simple CAPTCHA with Cloudflare Turnstile WordPress plugin before 1.42.0 does not bind its Turnstile validation cache to the single-use challenge token in its Forminator integration, instead keying it to an attacker-controlled, reusable request value, allowing unauthenticated attackers to solve one challenge and then replay token-less form submissions for a short window, defeating the anti-abuse protection the plugin provides.
CVSS metrics
3 scores · 3 sources · 1 version- NVDNIST5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- wordfenceSource5.3MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS trend
Probability
0.16%
Chance of exploitation in the next 30 days
Percentile
5%
Versus all other CVEs
30-day change
+0.05 pp
From 0.11% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (wpscan.com)
Maturity: unknown
Weaknesses
CWE · root cause- CWE-345Insufficient Verification of Data AuthenticityThe product does not sufficiently verify the origin or authenticity of data, in a way that causes it to accept invalid data.
- CWE-804Guessable CAPTCHAThe product uses a CAPTCHA challenge, but the challenge can be guessed or automatically recognized by a non-human actor.
Affected systems
Unknown1 product
Wordpress1 product
- simple-cloudflare-turnstile≤ 1.41.0 (fixed in 1.42.0)
2 vendors · 2 products