EUVD-2026-49243
GHSA-94w5-q7f9-fhrx
Severity by source
AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Requires Contributor privileges (PR:L) and user interaction (UI:R); XSS enables scope change (S:C) with low impact to confidentiality, integrity, and availability.
Primary rating from Vendor (Patchstack).
CVSS VectorVendor: Patchstack
Lifecycle Timeline
1DescriptionCVE.org
Contributor Cross Site Scripting (XSS) in Photonic Gallery & Lightbox for Flickr, SmugMug & Others <= 3.33 versions.
AnalysisAI
Stored cross-site scripting in the Photonic Gallery & Lightbox plugin for WordPress allows authenticated attackers with Contributor-level privileges to inject arbitrary web scripts. When an administrator or other higher-privilege user views a crafted gallery or album configuration, the malicious script executes in their browser, potentially leading to session hijacking or account takeover. This affects all versions up to and including 3.33.
Technical ContextAI
The vulnerability lies in the Photonic Gallery & Lightbox WordPress plugin (by Sayontan Sinha), a tool for embedding photo galleries from Flickr, SmugMug, and other services. The plugin fails to properly sanitize user-supplied input in gallery configuration parameters, enabling stored XSS (CWE-79). The CPE cpe:2.3:a:sayontan_sinha:photonic_gallery_&_lightbox_for_flickr,_smugmug_&_others:*:*:*:*:*:*:*:* confirms the product identity. The issue arises because a low-privilege role (Contributor) can inject JavaScript payloads that are stored and later rendered in the admin interface, triggering a Cross-Site Scripting attack with a scope change (S:C in CVSS). No specific protocol or library is involved beyond standard WordPress/PHP web application behaviour.
RemediationAI
Immediately update to Photonic Gallery & Lightbox version 3.34 or later, which contains the official vendor patch. The fix is confirmed by Patchstack in the advisory referenced above. If an immediate update is not feasible, restrict Contributor access to trusted users only and review any existing gallery content for suspicious script injections. No other workarounds are effective, as the vulnerability resides in the core plugin logic. Administrators should also consider implementing Content Security Policy (CSP) headers to mitigate XSS impact across the site, but this is a defence-in-depth measure, not a substitute for the patch.
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External POC / Exploit Code
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