{"id":"CVE-2026-4329","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-4329","generatedAt":"2026-10-28T10:36:36.089Z","title":"The Blackhole for Bad Bots plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the User-Agent HTTP header in all versions up to and including 3.8.","description":"The Blackhole for Bad Bots plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the User-Agent HTTP header in all versions up to and including 3.8. This is due to insufficient input sanitization and output escaping. The plugin uses sanitize_text_field() when capturing bot data (which strips HTML tags but does not escape HTML entities like double quotes), then stores the data via update_option(). When an administrator views the Bad Bots log page, the stored data is output directly into HTML input value attributes (lines 75-83) without esc_attr() and into HTML span content without esc_html(). This makes it possible for unauthenticated attackers to inject arbitrary web scripts that execute when an administrator views the Blackhole Bad Bots admin page.","published":"2026-03-26T05:16:40.000Z","lastModified":"2026-06-17T10:56:26.000Z","status":"Deferred","sourceIdentifier":"security@wordfence.com","cvss":{"version":"3.1","score":7.2,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N"},"cwe":["CWE-79"],"affected":[],"epss":{"score":0.00321,"percentile":0.24955,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.32%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[],"references":[{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/badbots-register.php#L75","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/badbots-register.php#L79","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/badbots-register.php#L85","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/blackhole-core.php#L180","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/tags/3.8/inc/blackhole-helpers.php#L22","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/badbots-register.php#L75","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/badbots-register.php#L79","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/badbots-register.php#L85","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/blackhole-core.php#L180","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/browser/blackhole-bad-bots/trunk/inc/blackhole-helpers.php#L22","source":"security@wordfence.com"},{"url":"https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3487350%40blackhole-bad-bots&new=3487350%40blackhole-bad-bots&sfp_email=&sfph_mail=","source":"security@wordfence.com"},{"url":"https://www.wordfence.com/threat-intel/vulnerabilities/id/a71992e2-fdac-4e89-8867-4b771d9b4374?source=cve","source":"security@wordfence.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-4329","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}