Live › vulnerability › CVE-2026-115683
Epiphany, the GNOME web browser, has a race condition that lets a malicious page approve a certificate exception for another host without a user click. An attacker who gets a victim to a malicious site can then perform man-in-the-middle attacks or spoof the target site until Epiphany restarts.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-30 14:30 UTC. All times on this page are UTC.
Anyone using Epiphany (GNOME Web) as a browser; the sources say all current versions are affected and the timing issue dates to the Epiphany 45.x era. The flaw is in the browser's own error page logic, so it applies to users browsing the web with Epiphany rather than to servers. Systems not running Epiphany can skip it.
No product ranges from the sources yet.
epiphany --version, since the sources say all current versions are affected.Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
A race condition in Epiphany allows a malicious website to bypass the TLS/SSL certificate warning page.
Epiphany 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.
If 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.
Upstream report: https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978 Proof of concept: https://beford.net/poc/ssl_poc.html Fix: 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.
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