CVE-2026-53900 Affecting firefox package, versions <152.0-r0
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-WOLFILATEST-FIREFOX-17763065
- published1 Jul 2026
- disclosed16 Jun 2026
Introduced: 16 Jun 2026
CVE-2026-53900 (opens in a new tab)How to fix?
Upgrade Wolfi firefox to version 152.0-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream firefox package and not the firefox package as distributed by Wolfi.
See How to fix? for Wolfi relevant fixed versions and status.
Firefox for iOS preserved cookies set on the initial PDF request across cross-origin HTTP redirects in TemporaryDocument, allowing a malicious site to inject arbitrary cookies into requests to an unrelated target domain. This vulnerability was fixed in Firefox for iOS 152.0.