medium

CVE-2026-70602

npm · electron

Summary

Electron: Extension tab APIs operate across session boundaries

Severity
medium
CVSS
6.6
EPSS
0.3% (p17)
CWE
CWE-284
Also known as
GHSA-m55f-7gqj-fr98
Published
2026-08-05
Updated
2026-08-05

Advisory details

Impact

Extension tab and scripting APIs were not scoped to the extension's own session. A malicious or compromised extension loaded into one session could navigate, script, and read from windows belonging to a different session.

Apps are only affected if they load Chrome extensions via session.loadExtension and rely on separate sessions to isolate that extension from other content. Apps that do not load extensions, or that use a single session, are not affected.

Workarounds

Only load extensions from sources you trust; do not rely on session separation alone to contain an extension.

Fixed Versions

For more information

If you have any questions or comments about this advisory, email Electron at security@electronjs.org

References

Related advisories

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Sources: CISA KEV (public domain), OSV.dev & GitHub Advisory Database (CC-BY-4.0), FIRST EPSS, NVD/CWE (public domain). Served live from the Stateward advisory database.