Cyber Resilience

CVE-2026-27411

Published
05 March 2026
Modified
22 April 2026
CVSS Score v3.1 5.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
EPSS Score 0.0019 9th percentile
Risk Priority 42 floored blend · peak EPSS

Summary

CVE-2026-27411 is a medium-severity Guessable CAPTCHA (CWE-804) vulnerability. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Password Guessing (T1110.001); ranked at the 9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

Guessable CAPTCHA vulnerability in jp-secure SiteGuard WP Plugin siteguard allows Functionality Bypass.This issue affects SiteGuard WP Plugin: from n/a through <= 1.7.9.

CWE(s)
CWE-804

Related Threats

MITRE ATT&CK Enterprise Techniques

T1110.001 Password Guessing Credential Access
Adversaries with no prior knowledge of legitimate credentials within the system or environment may guess passwords to attempt access to accounts.
attack.mitre.org →
T1110.003 Password Spraying Credential Access
Adversaries may use a single or small list of commonly used passwords against many different accounts to attempt to acquire valid account credentials.
attack.mitre.org →
T1110 Brute Force Credential Access
Adversaries may use brute force techniques to gain access to accounts when passwords are unknown or when password hashes are obtained.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2025-70129Shared CWE-804
CVE-2025-32036Shared CWE-804
CVE-2024-23567Shared CWE-804
CVE-2025-1262Shared CWE-804
CVE-2026-40935Shared CWE-804
CVE-2026-49953Shared CWE-804
CVE-2024-23566Shared CWE-804
CVE-2024-30540Shared CWE-804
CVE-2024-31295Shared CWE-804
CVE-2025-40916Shared CWE-804

Affected Assets

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure development practices directly require non-guessable CAPTCHA implementations.

PR.AA-03 partial match
prevents

Strong authentication practices include effective CAPTCHA challenges to block automated actors.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect weak CAPTCHA implementations before deployment.

A.8.26 Application security requirements partial match
prevents

Application security requirements mandate effective CAPTCHA challenges that cannot be easily bypassed by bots.

A.8.28 Secure coding partial match
prevents

Secure coding practices ensure CAPTCHA logic is resistant to automated recognition or guessing attacks.

A.8.5 Secure authentication partial match
prevents

Strong authentication mechanisms include robust CAPTCHA implementations that resist automated guessing.

References