{"id":"CVE-2026-115683","published":"2026-10-30T14:16:39.373","lastModified":"2026-10-30T19:27:58.620","description":"A race condition in Epiphany allows a malicious website to bypass the TLS/SSL certificate warning page.\n\nEpiphany registers the main-world script message handler \"tlsErrorPage\" so its internal TLS error page can implement \"Accept Risk and Proceed\". The handler was registered immediately before loading the error page, leaving a brief window where the previously loaded untrusted origin could still call window.webkit.messageHandlers.tlsErrorPage.postMessage(...). The only authorization check compares a numeric WebKit page id that increments predictably; an attacker can burst-guess ids and approve a certificate exception with no user click.\n\nIf a victim visits malicious site A that redirects to site B with an invalid certificate, site A can, for a few milliseconds, disable TLS certificate error warnings for host B until Epiphany is restarted, enabling man-in-the-middle or site spoofing for that host.\n\nUpstream report: https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978\nProof of concept: https://beford.net/poc/ssl_poc.html\nFix: https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245 (register handlers on LOAD_COMMITTED). No fixed release tagged yet; reporter and maintainer describe all current versions as affected. Maintainer notes the risky registration timing dates to commit 1da1caed (Epiphany 45.x era); before that the handlers were always registered and similarly reachable from web content.","cvssScore":6.8,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","cwes":["CWE-367"],"vendors":[],"products":[],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-115683","tags":[]},{"url":"https://beford.net/poc/ssl_poc.html","tags":[]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2560012","tags":[]},{"url":"https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245","tags":[]},{"url":"https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978","tags":[]},{"url":"https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}