EUVD-2026-21647CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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3Description
The GreenShift - Animation and Page Builder Blocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 12.8.9 This is due to insufficient input sanitization and output escaping in the gspb_greenShift_block_script_assets() function. The function uses str_replace() to insert 'fetchpriority="high"' before 'src=' attributes when processing greenshift-blocks/image blocks with the disablelazy attribute enabled. Because this replacement operates on the entire HTML string without parsing, contributors can inject the string 'src=' into HTML attribute values (such as class attributes). When the str_replace executes, the double quotes in the replacement string break out of the attribute context, allowing injection of malicious HTML attributes like onfocus with JavaScript payloads. 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.
Analysis
Stored cross-site scripting in GreenShift - Animation and Page Builder Blocks plugin for WordPress up to version 12.8.9 allows authenticated contributors to inject arbitrary JavaScript into pages via improper HTML string manipulation in the gspb_greenShift_block_script_assets() function. The vulnerability exploits a naive str_replace() operation that fails to parse HTML context, enabling attackers to break out of attribute boundaries and inject malicious event handlers like onfocus with JavaScript payloads that execute when users access affected pages. …
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