CVE-2026-115683

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    CVE-2026-115683

    Published: 30 Oct 2026Last Modified: 4 Nov 2026

    Summary: epiphany: TLS certificate warning bypass via race in tlsErrorPage message handler

    Details: 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.

    References: https://beford.net/poc/ssl_poc.html, https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978, https://access.redhat.com/security/cve/CVE-2026-115683, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/115xxx/CVE-2026-115683.json, https://nvd.nist.gov/vuln/detail/CVE-2026-115683, https://bugzilla.redhat.com/show_bug.cgi?id=2560012, https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245, https://gitlab.gnome.org/GNOME/epiphany

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -1448cdbd2fcb343f84b15caf3d33395fe2dc828a

    Affected versions

    51.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-115683 | CVE-DB