{"apiVersion":"1.0","identifier":"CVE-2026-75833","description":"The Grav API plugin (getgrav/grav-plugin-api, bundled with Grav 2.0-s admin-next/API stack) before version 1.0.14 contains an open redirect weakness in SsoController::sanitizeReturnTo(). The function rejects a literal -//- prefix but does not account for browsers normalizing backslashes to slashes in special (http/https) schemes, so a returnTo value such as -/\\evil.com- passes the guard and is later resolved by the browser as the protocol-relative URL -//evil.com-. Following a legitimate OAuth login flow, an attacker-supplied returnTo parameter could redirect an authenticated victim to an attacker-controlled site for post-login phishing. Full browser-side exploitability depends on the admin-next SPA-s client-side oauth-callback handler and was not independently verified by the reporter.","publishedAt":"2026-08-18T12:19:33","lastModifiedAt":"2026-08-18T14:18:10","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-75833","cvssScore":4.2,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N","epssProbability":0.00194,"riskScore":0.43,"affectedProduct":"grav-plugin-api","affectedVersions":"<1.0.14","vulnerabilityType":"Library","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-75833","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-75833","en":"https://www.redsauce.net/en/cves/CVE-2026-75833","fr":"https://www.redsauce.net/fr/cves/CVE-2026-75833","pt":"https://www.redsauce.net/pt/cves/CVE-2026-75833","de":"https://www.redsauce.net/de/cves/CVE-2026-75833","sk":"https://www.redsauce.net/sk/cves/CVE-2026-75833","el":"https://www.redsauce.net/el/cves/CVE-2026-75833"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-75833"}}