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VulnerabilityPublished

CVE-2026-102673: Electron drops inherited HTML sandbox restrictions for popups opened through OpenURLFromTab

Affects electronSource GCVE Database

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Not known to be exploited · CVSS 8.2 High : upgrade to 43.0.0 soon.

Data as of 13 Nov 2026, 23:53 UTC

CVSS 3.1 base score
8.2High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 43.0.0
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 29 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 14 Nov 2026.

What to do

Upgrade electron to 43.0.0.

Affected software

ProductAffectedFixed in
npmelectronAffected
  • >=43.0.0-alpha.1 <43.0.0
Fixed in
  • 43.0.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available in Electron versions 41.10.4, 42.5.2, and 43.0.0. Applications should upgrade to these or later versions to remediate the vulnerability. As a workaround, developers can use the 'setWindowOpenHandler' on the parent WebContents to deny or constrain popups opened from sandboxed frames, or avoid applying 'allow-popups' to sandboxed iframes that render untrusted content.

Description

Electron versions prior to 41.10.4, between 42.0.0-alpha.1 and 42.5.2, and between 43.0.0-alpha.1 and 43.0.0 allowed popups opened from sandboxed iframes with 'allow-scripts allow-popups' to drop sandbox restrictions. This enabled sandboxed content to open popups with the embedding app's full origin, potentially accessing cookies, storage, and same-origin scripting. The issue affects apps embedding untrusted content in sandboxed iframes with these permissions. Fixed versions are 41.10.4, 42.5.2, and 43.0.0.

References

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