Login No Captcha reCAPTCHA <= 1.8.0 - Unauthenticated Stored Cross-Site Scripting via PHP_SELF

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Summary

CVECVE-2026-2374
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-28 05:16:34 UTC
Updated2026-05-28 13:45:25 UTC
DescriptionThe Login No Captcha reCAPTCHA plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `$_SERVER['PHP_SELF']` superglobal in all versions up to, and including, 1.8.0. This is due to the `authenticate()` function storing the unsanitized output of `basename($_SERVER['PHP_SELF'])` in the `login_nocaptcha_error` WordPress option when a login attempt is made from a non-standard login page (e.g., xmlrpc.php). The `admin_notices()` function then echoes this stored value directly into the admin dashboard HTML without escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when an administrator with a whitelisted IP address visits the WordPress dashboard within 30 seconds of the attack.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

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

EPSS: 0.001040000 probability, percentile 0.280100000 (date 2026-06-01)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED7.2HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Robertpeake Login No Captcha ReCAPTCHA affected 1.8.0 semver Not specified

References

ReferenceSourceLinkTags
www.wordfence.com/threat-intel/vulnerabilities/id/99dfce3b-2b47-41bf-8b20-b53fb... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/login-recaptcha/trunk/login-nocaptcha.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/changeset [email protected] plugins.trac.wordpress.org
wordpress.org/plugins/login-recaptcha [email protected] wordpress.org
plugins.trac.wordpress.org/browser/login-recaptcha/trunk/login-nocaptcha.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/login-recaptcha/tags/1.7.3/login-nocaptcha.php [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/login-recaptcha/tags/1.7.3/login-nocaptcha.php [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: ISMAILSHADOW (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-26T14:58:05.000ZVendor Notified
CNA2026-05-27T14:54:36.000ZDisclosed
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