EUVD-2026-41342
GHSA-h7qc-4h62-77r8
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Subscriber authentication (PR:L) and admin victim page-load (UI:R) required; S:C reflects admin-context execution; A:N assigned as XSS does not directly impact availability.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
1DescriptionCVE.org
Subscriber Cross Site Scripting (XSS) in ShortPixel Adaptive Images <= 3.11.3 versions.
AnalysisAI
Stored Cross-Site Scripting in ShortPixel Adaptive Images WordPress plugin (versions <= 3.11.3) enables authenticated subscriber-role users to inject malicious scripts that execute in the browsers of higher-privileged users, including administrators. The CVSS changed-scope indicator (S:C) signals that injected payloads can transcend the attacker's own session context - a meaningful risk in WordPress environments where admin account takeover is feasible via session hijacking. No public exploit has been identified and this vulnerability is not listed in CISA KEV at time of analysis.
Technical ContextAI
ShortPixel Adaptive Images (CPE: cpe:2.3:a:shortpixel:shortpixel_adaptive_images:*:*:*:*:*:*:*:*) is a WordPress plugin that serves optimized, responsive images through the ShortPixel CDN, processing image-related inputs from WordPress users. CWE-79 (Improper Neutralization of Input During Web Page Generation) identifies the root cause: subscriber-controlled input is insufficiently sanitized or output-encoded before being rendered in HTML, producing an executable script context. The PR:L metric in the CVSS vector confirms exploitation is bounded to authenticated WordPress users at subscriber tier or above. The S:C (Changed Scope) metric is characteristic of stored XSS in WordPress plugins where user-supplied content is later rendered in the administrative dashboard or on pages visited by privileged users, effectively elevating the attack's reach beyond the attacker's own session.
RemediationAI
Update ShortPixel Adaptive Images to a version above 3.11.3 immediately; the exact patched release is not independently confirmed from available input data - consult the Patchstack advisory (https://patchstack.com/database/wordpress/plugin/shortpixel-adaptive-images/vulnerability/wordpress-shortpixel-adaptive-images-plugin-3-11-3-cross-site-scripting-xss-vulnerability) or the WordPress plugin repository to identify the current fixed release before upgrading. Upstream fix availability is indicated but a tagged patched version is not confirmed from the data provided. As an interim compensating control, disable open subscriber registration (Settings > General > uncheck 'Anyone can register') to eliminate the unauthenticated-to-subscriber escalation path - note this will affect legitimate user onboarding flows. A Web Application Firewall rule targeting XSS payloads in plugin-controlled input fields provides additional defense-in-depth, but WAF rules require tuning to avoid blocking legitimate image management inputs.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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