{"id":"CVE-2026-75834","revision":"17d591f30adf464b867590921e648eca","records":[{"revision":"17d591f30adf464b867590921e648eca","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-75834","aliases":[],"title":"Grav before 2.0.14 Stored XSS via Invalid UTF-8 Byte","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.","state":0,"publishedAt":"2026-08-18T11:19:45.094+00:00","modifiedAt":"2026-10-08T15:24:58.75+00:00","affected":[{"ecosystem":"Vendor product","name":"grav","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"getgrav\",\n                    \"product\": \"grav\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\",\n                            \"lessThan\": \"2.0.14\"\n                        },\n                        {\n                            \"version\": \"2.0.14\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"packageURL\": \"pkg:composer/getgrav/grav\"\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N","score":5.1,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N","score":5.4,"severity":"MEDIUM"}],"references":["https://github.com/getgrav/grav/security/advisories/GHSA-q2j8-x8hf-63ch","https://www.vulncheck.com/advisories/grav-before-stored-xss-via-invalid-utf-8-byte"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-75834","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-75834","identifiers":["CVE-2026-75834"]},"retained":false,"historicalAffected":[]}],"coverage":[]}