{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-4329/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["medium"],"_cs_tags":["wordpress","xss","plugin","cve-2026-4329"],"_cs_type":"advisory","_cs_vendors":[],"content_html":"\u003cp\u003eThe Blackhole for Bad Bots plugin for WordPress, up to and including version 3.8, contains a stored cross-site scripting (XSS) vulnerability. The vulnerability stems from insufficient input sanitization and output escaping of the User-Agent HTTP header when capturing bot data. Specifically, the plugin uses \u003ccode\u003esanitize_text_field()\u003c/code\u003e which strips HTML tags but does not escape HTML entities. This data is then stored using \u003ccode\u003eupdate_option()\u003c/code\u003e and later displayed on the Bad Bots log page. The stored data is output into HTML input value attributes and HTML span content without proper escaping via \u003ccode\u003eesc_attr()\u003c/code\u003e or \u003ccode\u003eesc_html()\u003c/code\u003e. This allows an unauthenticated attacker to inject arbitrary web scripts that are executed when an administrator views the Blackhole Bad Bots admin page, potentially leading to privilege escalation or other malicious actions.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eAn unauthenticated attacker sends a request to the WordPress site with a malicious User-Agent header containing XSS payload.\u003c/li\u003e\n\u003cli\u003eThe Blackhole for Bad Bots plugin captures the User-Agent string using \u003ccode\u003esanitize_text_field()\u003c/code\u003e, which inadequately sanitizes the input.\u003c/li\u003e\n\u003cli\u003eThe plugin stores the inadequately sanitized User-Agent string in the WordPress options database using \u003ccode\u003eupdate_option()\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eA WordPress administrator navigates to the Blackhole Bad Bots admin page.\u003c/li\u003e\n\u003cli\u003eThe plugin retrieves the stored User-Agent strings from the database.\u003c/li\u003e\n\u003cli\u003eThe plugin outputs the stored User-Agent string directly into HTML input value attributes (lines 75-83) without \u003ccode\u003eesc_attr()\u003c/code\u003e and into HTML span content without \u003ccode\u003eesc_html()\u003c/code\u003e on the admin page.\u003c/li\u003e\n\u003cli\u003eThe administrator\u0026rsquo;s browser executes the injected XSS payload.\u003c/li\u003e\n\u003cli\u003eThe XSS payload can perform actions such as stealing the administrator\u0026rsquo;s session cookie, redirecting the administrator to a malicious site, or performing actions on behalf of the administrator.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of this vulnerability allows unauthenticated attackers to inject arbitrary web scripts that execute in the context of an administrator\u0026rsquo;s browser session. This can lead to various malicious outcomes, including account takeover, data theft, and defacement of the WordPress site. Given the widespread use of WordPress and the Blackhole for Bad Bots plugin, a successful exploit could impact a significant number of websites.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUpgrade the Blackhole for Bad Bots plugin to a version greater than 3.8 to remediate CVE-2026-4329.\u003c/li\u003e\n\u003cli\u003eImplement a Web Application Firewall (WAF) rule to filter requests containing suspicious User-Agent headers that might exploit CVE-2026-4329.\u003c/li\u003e\n\u003cli\u003eMonitor web server logs for requests with unusual or potentially malicious User-Agent strings to detect potential exploitation attempts related to CVE-2026-4329.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-03-26T05:16:40Z","date_published":"2026-03-26T05:16:40Z","id":"/briefs/2024-01-11-wordpress-blackhole-xss/","summary":"The Blackhole for Bad Bots WordPress plugin through version 3.8 is vulnerable to stored cross-site scripting (XSS) via the User-Agent HTTP header, allowing unauthenticated attackers to inject arbitrary web scripts that execute when an administrator views the plugin's admin page.","title":"Blackhole for Bad Bots WordPress Plugin Stored XSS Vulnerability","url":"https://feed.craftedsignal.io/briefs/2024-01-11-wordpress-blackhole-xss/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-4329","version":"https://jsonfeed.org/version/1.1"}