{"apiVersion":"1.0","identifier":"CVE-2026-75834","description":"Grav before 2.0.14 contains a stored cross-site scripting vulnerability in the Security::detectXss() function (system/src/Grav/Common/Security.php). All XSS detection patterns use the PCRE /u (UTF-8) modifier, so a single invalid UTF-8 byte anywhere in page content causes preg_match() to return false for every pattern, silently bypassing the save-time XSS safety gate (Validation::checkSafety()). An authenticated attacker with page-edit permissions (without the security.xss_whitelist privilege) can store malicious JavaScript that executes in the browser of a visitor who views the affected page.","publishedAt":"2026-08-18T12:19:33","lastModifiedAt":"2026-08-18T14:18:11","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-75834","cvssScore":5.4,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","epssProbability":0.00182,"riskScore":0.55,"affectedProduct":"Grav","affectedVersions":"<2.0.14","vulnerabilityType":"Web app","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-75834","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-75834","en":"https://www.redsauce.net/en/cves/CVE-2026-75834","fr":"https://www.redsauce.net/fr/cves/CVE-2026-75834","pt":"https://www.redsauce.net/pt/cves/CVE-2026-75834","de":"https://www.redsauce.net/de/cves/CVE-2026-75834","sk":"https://www.redsauce.net/sk/cves/CVE-2026-75834","el":"https://www.redsauce.net/el/cves/CVE-2026-75834"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-75834"}}