Exposure of Resource to Wrong Sphere Affecting Firefox-ESR package, versions [,115.38)[116.0,140.13)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published25 Jul 2026
- disclosed21 Jul 2026
- creditUnknown
Introduced: 21 Jul 2026
CVE-2026-16358 (opens in a new tab)How to fix?
Upgrade Firefox-ESR to version 115.38, 140.13 or higher.
Overview
Affected versions of this package are vulnerable to Exposure of Resource to Wrong Sphere in the WebRender process. An attacker can access data from other sites by leveraging improper site isolation between rendered web content.