{"id":"CVE-2026-61453","summary":"Grav before 2.0.1 XSS via Twig String Concatenation","details":"Grav v2.0.0 contains a cross-site scripting vulnerability (fixed in 2.0.1). The XSS blueprint validator (Security::detectXss()) runs on raw page content before Twig processing. When Twig content processing is enabled (twig_content.process_enabled: true), an attacker with page-write API permission can use Twig's string concatenation operator (~) to dynamically construct event handler names, dangerous tag names, or dangerous protocols at render time (e.g. {% set x = \"on\" ~ \"error\" %}). The validator sees only the harmless Twig expression and allows the content, but after Twig rendering the output (rendered via {{ page.content|raw }}) contains an active payload such as \u003cimg src=1 onerror=alert(1)\u003e, executing arbitrary JavaScript in visitors' browsers.","aliases":["GHSA-2c4f-86xc-cr74"],"modified":"2026-07-17T03:41:50.102977553Z","published":"2026-07-15T11:25:45.830Z","database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-79"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61453.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/61xxx/CVE-2026-61453.json"},{"type":"ADVISORY","url":"https://github.com/getgrav/grav/security/advisories/GHSA-2c4f-86xc-cr74"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-61453"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/grav-before-xss-via-twig-string-concatenation"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/getgrav/grav","events":[{"introduced":"0"},{"fixed":"6f619f0ae72cb64ea4daea1d0f050f740da347e6"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"2.0.1"}],"source":"AFFECTED_FIELD"}}],"versions":["1.7.53","1.7.52","1.7.51","1.7.39.1","1.7.39","1.7.38","1.7.37.1","1.7.37","1.7.36","1.7.35","1.7.34","1.7.33","1.7.32","1.7.31","1.7.30","1.7.29.1","1.7.29","1.7.28","1.7.27.1","1.7.27","1.7.26.1","1.7.26","1.7.25","1.7.24","1.7.23","1.7.22","1.7.21","1.7.20","1.7.19","1.7.18","1.7.17","1.7.16","1.7.15","1.7.14","1.7.13","1.7.12","1.7.10","1.7.9","1.7.8","1.7.7","1.7.6","1.7.5","1.7.4","1.7.3","1.7.1","1.7.0","1.7.0-rc.20","1.7.0-rc.19","1.7.0-rc.18","1.7.0-rc.17","1.7.0-rc.15","1.7.0-rc.14","1.7.0-rc.13","1.7.0-rc.12","1.7.0-rc.10","1.7.0-rc.9","1.7.0-rc.8","1.7.0-rc.7","1.7.0-rc.6","1.7.0-rc.5","1.7.0-rc.4","1.7.0-rc.3","1.7.0-rc.2","1.7.0-rc.1","1.7.0-beta.10","1.7.0-beta.9","1.7.0-beta.8","1.7.0-beta.7","1.7.0-beta.6","1.7.0-beta.5","1.7.0-beta.4","1.7.0-beta.3","1.7.0-beta.2","1.7.0-beta.1","1.6.0-rc.4","1.6.0-rc.3","1.6.0-rc.2","1.6.0-rc.1","1.6.0-beta.8","1.6.0-beta.7","1.6.0-beta.6","1.6.0-beta.5","1.6.0-beta.2","1.6.0-beta.1","1.5.0-rc.1","1.5.0-beta.2","1.5.0-beta.1","1.3.0-rc.5","1.3.0-rc.4","1.3.0-rc.3","1.3.0-rc.1","1.2.0-rc.3","1.2.0-rc.2","1.2.0-rc.1","1.1.9-rc.3","1.1.9-rc.2","1.1.9-rc.1","1.1.0-rc.3","1.1.0-rc.2","1.1.0-rc.1","1.1.0-beta.5","1.1.0-beta.4","1.1.0-beta.3","1.1.0-beta.2","1.1.0-beta.1","0.9.19","0.9.18","0.9.17","0.9.16","0.9.15","0.9.14","0.9.13","0.9.12","0.9.11","0.9.10","0.9.9","0.9.8","0.9.7","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.0","0.8.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-61453.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N"}]}