Quick answers
- Is CVE-2026-84135 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-84135 being exploited in the wild.
- How severe is CVE-2026-84135?
- Critical severity, with a CVSS score of 9.8, published 1 September 2026.
- Which products and versions are affected?
- Mozilla Firefox Focus for Android.
- Is there a fix for CVE-2026-84135?
- A patch was published on 2026-09-01: Fixed in Firefox 155 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-84135 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-84135?
- Check whether you run Mozilla Firefox Focus for Android or Mozilla Firefox Mobile. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
CVE-2026-84135 is an "other issue" (unspecified vulnerability class) affecting Firefox Focus for Android. The full technical details are not available in the advisory—the underlying bug (2046661) is access-restricted on Mozilla's Bugzilla. The vulnerability was fixed in Firefox 155, released on September 1, 2026. No evidence of active exploitation in the wild has been reported. Users running Firefox Focus for Android should upgrade to the patched version.
Affected products
- Mozilla Firefox Focus for Android
Timeline
- 2026-09-01: disclosed
- 2026-09-01: patched: Fixed in Firefox 155