CVE-2026-8900

Description

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.

PUBLISHED Reserved 2026-05-18 | Published 2026-06-05 | Updated 2026-06-06 | Assigner Wordfence

Problem types

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

Product status

Timeline

Credits

Gilang Asra Bilhadi finder

References

www.wordfence.com/...-fdff-4525-9272-7a3db58b81a0?source=cve

plugins.trac.wordpress.org/...show/trunk/simpleslideshow.php

plugins.trac.wordpress.org/...show/trunk/simpleslideshow.php

plugins.trac.wordpress.org/...show/trunk/simpleslideshow.php

plugins.trac.wordpress.org/...lideshow&sfp_email=&sfph_mail=

cve.org (CVE-2026-8900)

nvd.nist.gov (CVE-2026-8900)

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