How severe is CVE-2026-40799?

CVE-2026-40799 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.

Is CVE-2026-40799 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-40799?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-40799 have an EU (EUVD) identifier?

Yes. CVE-2026-40799 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36808.

When was CVE-2026-40799 published?

CVE-2026-40799 was published on 2026-06-15 and last updated on 2026-06-17.

CVE-2026-40799

CVE-2026-40799 is a medium-severity vulnerability with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-288.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36808
Weakness: CWE-288
Published: 2026-06-15
Last modified: 2026-06-17

Description

Unauthenticated Broken Authentication in Simple Cloudflare Turnstile <= 1.38.0 versions.

Frequently asked questions

What is CVE-2026-40799?: Unauthenticated Broken Authentication in Simple Cloudflare Turnstile <= 1.38.0 versions.
How severe is CVE-2026-40799?: CVE-2026-40799 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability none.
Is CVE-2026-40799 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-40799?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-40799 have an EU (EUVD) identifier?: Yes. CVE-2026-40799 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36808.
When was CVE-2026-40799 published?: CVE-2026-40799 was published on 2026-06-15 and last updated on 2026-06-17.

References

https://patchstack.com/database/wordpress/plugin/simple-cloudflare-turnstile/vulnerability/wordpress-simple-cloudflare-turnstile-plugin-1-38-0-broken-authentication-vulnerability?_s_id=cve

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