EUVD-2026-57876
GHSA-48q7-w7r3-3jjg
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
PR:L reflects mandatory subscriber authentication; S:C captures cross-user browser context; A:N assigned as stored XSS here has no direct availability impact on systems.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
1DescriptionCVE.org
Subscriber Cross Site Scripting (XSS) in Profile Extra Fields by BestWebSoft <= 1.3.4 versions.
AnalysisAI
Stored cross-site scripting in the Profile Extra Fields by BestWebSoft WordPress plugin (versions ≤1.3.4) allows an authenticated subscriber-level user to inject arbitrary JavaScript into custom profile fields, which then executes in the browser of any higher-privileged user who views the affected profile - including site administrators. The scope-changed impact (S:C) is the key risk multiplier: a minimally privileged attacker can potentially hijack admin sessions or perform unauthorized actions on behalf of victims. No public exploit code or active exploitation has been identified at time of analysis.
Technical ContextAI
Profile Extra Fields by BestWebSoft is a WordPress plugin (CPE: cpe:2.3:a:bestwebsoft:profile_extra_fields_by_bestwebsoft) that extends the default user profile with custom fields. CWE-79 (Improper Neutralization of Input During Web Page Generation) indicates that user-supplied input stored in these custom profile fields is not adequately sanitized or output-encoded before being rendered in the browser. In WordPress's role hierarchy, the 'subscriber' role is the lowest authenticated tier - any registered user holds it by default - meaning exploitation does not require elevated site access. The CVSS vector's S:C (Scope Changed) component reflects that the vulnerability escapes the attacker's own profile context and affects the browser security context of other users, consistent with a stored XSS pattern where malicious payloads persist server-side until rendered for a victim.
RemediationAI
The primary remediation is to update the Profile Extra Fields by BestWebSoft plugin to a version beyond 1.3.4; however, a specific patched release version has not been independently confirmed in the available data - consult the Patchstack advisory at https://patchstack.com/database/wordpress/plugin/profile-extra-fields/vulnerability/wordpress-profile-extra-fields-by-bestwebsoft-plugin-1-3-4-cross-site-scripting-xss-vulnerability and the official WordPress plugin repository for the latest release. If an update is not yet available or cannot be applied immediately, a practical compensating control is to disable open subscriber self-registration under WordPress Settings → General → Membership, which eliminates the ability for unauthenticated visitors to obtain the subscriber role required for exploitation - the trade-off is that legitimate users can no longer self-register. Alternatively, the plugin can be deactivated entirely until a patched version is confirmed. Site administrators should also audit existing subscriber accounts for unexpected registrations if this vector was previously exposed.
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External POC / Exploit Code
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