CVE-2026-35569: Stored XSS in SEO Fields Leads to Authenticated API Data Exposure in ApostropheCMS

April 16, 2026 (updated April 30, 2026)

A stored cross-site scripting (XSS) vulnerability exists in SEO-related fields (SEO Title and Meta Description) in ApostropheCMS.

Improper neutralization of user-controlled input in SEO-related fields allows injection of arbitrary JavaScript into HTML contexts, resulting in stored cross-site scripting (XSS). This can be leveraged to perform authenticated API requests and exfiltrate sensitive data, resulting in a compromise of application confidentiality.

References

Code Behaviors & Features

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