Electron is widely used in desktop apps; this sandbox bypass can expose app-origin cookies/storage across many popular applications.
CVE-2026-102673
Electron sandboxed iframe popup bypass exposes app origin data.
Is CVE-2026-102673 being exploited?
Not confirmed. CVE-2026-102673 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked.
How severe is CVE-2026-102673?
CVE-2026-102673 is rated High with a CVSS score of 8.2. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-102673?
Yes. A fix has been recorded for CVE-2026-102673. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-102673 affect?
CVE-2026-102673 affects Electron < 41.10.4, Electron < 42.5.2, Electron < 43.0.0, Electron-based apps (e.g., Slack, VS Code, Discord). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-102673?
Upgrade to 41.10.4 / 42.5.2 / 43.0.0+ and audit sandboxed iframes.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
A malicious sandboxed iframe can open a popup with the app's origin, exposing cookies, storage and same-origin scripting — enabling data theft and session hijack.
Immediate action required
- affected< 41.10.4
- affected>= 42.0.0-alpha.1 and < 42.5.2
- affected>= 43.0.0-alpha.1 and < 43.0.0
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.