EUVD-2026-34925
GHSA-vw38-cqg7-qmjq
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
The Simple SEO Slideshow plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Shortcode Attributes in all versions up to, and including, 1.2.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. WordPress KSES does not strip malicious shortcode attribute values on post save, allowing contributor-level users to persist payloads that execute for any visitor, including administrators reviewing the post.
AnalysisAI
Stored Cross-Site Scripting in the Simple SEO Slideshow WordPress plugin (all versions through 1.2.8) allows authenticated attackers holding contributor-level roles to inject persistent JavaScript payloads via unsanitized shortcode attributes. Because WordPress KSES does not strip malicious values from shortcode attributes during post save, the payload survives sanitization and executes for every subsequent visitor - including administrators reviewing the post - making privilege escalation a realistic downstream impact. No public exploit code has been identified at time of analysis, and the vulnerability is not listed in the CISA KEV catalog, though the Wordfence intelligence platform has formally catalogued it.
Technical ContextAI
The affected component is the Simple SEO Slideshow WordPress plugin, confirmed across all releases up to and including version 1.2.8. The vulnerability is rooted in CWE-79 (Improper Neutralization of Input During Web Page Generation), specifically the stored variant. WordPress shortcode attributes are a common injection surface: when a plugin renders shortcode output directly into page HTML without applying wp_kses, esc_attr, or equivalent sanitization/escaping on attribute values, attacker-supplied strings survive into the DOM. The plugin source code referenced at simpleslideshow.php lines 235, 334, and 356 on the WordPress Trac browser are the identified unsanitized output points. A key architectural nuance here is that WordPress KSES - the built-in content filtering system - does not inspect or strip values embedded within custom shortcode attributes at post-save time, meaning the payload persists in the database and re-executes on every page render. The CVSS vector AV:N/AC:L/PR:L/UI:N/S:C reflects a network-reachable, low-complexity attack that changes scope beyond the vulnerable component itself, consistent with script injection that affects sessions of users other than the attacker.
RemediationAI
A code-level fix has been committed to the WordPress.org plugin repository, as referenced by the Trac changeset at https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3551425%40simple-seo-slideshow&new=3551425%40simple-seo-slideshow. However, the exact released plugin version containing this fix is not confirmed in the available data - the fix should be treated as an upstream commit rather than a verified tagged release. Site administrators should update the Simple SEO Slideshow plugin to the latest available version in the WordPress plugin directory immediately, then verify the installed version post-update. As a compensating control pending a confirmed patched release, restrict the contributor role to explicitly trusted users or disable new contributor registrations; this directly eliminates the PR:L attack surface. Alternatively, a Web Application Firewall rule blocking stored XSS patterns in shortcode attribute contexts (available through Wordfence Premium, for example) can provide runtime mitigation with minimal operational side effects.
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Same weakness CWE-79 – Cross-site Scripting (XSS)
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External POC / Exploit Code
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