{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-115683","assignerOrgId":"92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5","state":"PUBLISHED","assignerShortName":"fedora","dateReserved":"2026-10-23T08:58:10.076Z","datePublished":"2026-10-30T13:33:02.733Z","dateUpdated":"2026-10-30T14:08:15.038Z"},"containers":{"cna":{"title":"epiphany: TLS certificate warning bypass via race in tlsErrorPage message handler","metrics":[{"other":{"content":{"value":"Moderate","namespace":"https://access.redhat.com/security/updates/classification/"},"type":"Red Hat severity rating"}},{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":6.8,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"REQUIRED","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N","version":"3.1"},"format":"CVSS"}],"descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"GNOME","product":"Epiphany","packageName":"epiphany","collectionURL":"https://gitlab.gnome.org/GNOME/epiphany","defaultStatus":"unaffected","versions":[{"version":"0","lessThan":"*","status":"affected","versionType":"semver"}]}],"references":[{"url":"https://access.redhat.com/security/cve/CVE-2026-115683","tags":["vdb-entry","x_refsource_REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2560012","name":"RHBZ#2560012","tags":["issue-tracking","x_refsource_REDHAT"]},{"url":"https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978"},{"url":"https://gitlab.gnome.org/GNOME/epiphany/-/merge_requests/2245"},{"url":"https://beford.net/poc/ssl_poc.html"}],"datePublic":"2026-10-21T00:00:00.000Z","problemTypes":[{"descriptions":[{"cweId":"CWE-367","description":"Time-of-check Time-of-use (TOCTOU) Race Condition","lang":"en","type":"CWE"}]}],"x_redhatCweChain":"CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition","timeline":[{"lang":"en","time":"2026-10-21T00:00:00.000Z","value":"Reported to Red Hat."},{"lang":"en","time":"2026-10-21T00:00:00.000Z","value":"Made public."}],"credits":[{"lang":"en","value":"Red Hat would like to thank Fernando Munoz for reporting this issue."}],"workarounds":[{"lang":"en","value":"Until a fixed Epiphany build is installed, avoid following links from untrusted sites to HTTPS destinations, and do not rely on Epiphany for sensitive sites when browsing untrusted content. Restrict network access for untrusted browsing where practical (https://cmetaxonomy.org/entries/CME-203.html). Restarting the browser clears any attacker-installed certificate exceptions for the session."}],"providerMetadata":{"orgId":"92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5","shortName":"fedora","dateUpdated":"2026-10-30T13:33:02.733Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"references":[{"url":"https://gitlab.gnome.org/GNOME/epiphany/-/work_items/2978","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-30T14:07:43.922960Z","id":"CVE-2026-115683","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-10-30T14:08:15.038Z"}}]}}