Cross-session data exposure via default cache reuse
Published Aug 5, 2026 · Updated Aug 5, 2026
Cross-session cache exposure in Electron allows remote attackers to reuse cached responses across otherwise isolated session partitions. When a custom protocol handler returns ProtocolResponse.url without ProtocolResponse.session, Electron fetches through defaultSession rather than the handler's session and can serve its cached response to another partition. Exploitation requires user interaction and an app that omits the response session while relying on session partitions to isolate content.
Summary
What happened
Cross-session cache exposure in Electron allows remote attackers to reuse cached responses across otherwise isolated session partitions. When a custom protocol handler returns ProtocolResponse.url without ProtocolResponse.session, Electron fetches through defaultSession rather than the handler's session and can serve its cached response to another partition. Exploitation requires user interaction and an app that omits the response session while relying on session partitions to isolate content.
The record
- CVE
- CVE-2026-70606
- Published
- Aug 5, 2026
- Updated
- Aug 5, 2026
- Vendor
- Electron
- Product
- Electron
- Classifications
- CWE-668
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 5, 2026CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=>= 40.0.0-alpha.1, < 40.10.6
- Affected versionversion=>= 41.0.0-alpha.1, < 41.9.1
- Affected versionversion=>= 42.0.0-alpha.1, < 42.5.1
- Affected versionversion=>= 43.0.0-alpha.1, < 43.0.0
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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