Quick answers
- Is CVE-2026-84117 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-84117 being exploited in the wild.
- How severe is CVE-2026-84117?
- High severity, with a CVSS score of 8.8, published 1 September 2026.
- Which products and versions are affected?
- Mozilla Firefox prior to 155.
- Is there a fix for CVE-2026-84117?
- 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-2026-84117 attacked?
- It is attacked over the network.
- Am I affected by CVE-2026-84117?
- Check whether you run Mozilla Firefox or Mozilla Firefox Mobile at an affected version. 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
This is a privilege escalation vulnerability specific to Firefox for Android. While the advisory does not provide detailed technical information about the vulnerability mechanism, the high CVSS score of 8.8 and classification as a privilege escalation suggest a significant elevation of privileges within the browser sandbox or operating system context. The vulnerability was identified internally by Mozilla security researchers and patched in Firefox 155 released on September 1, 2026. No evidence of active exploitation in the wild has been reported at the time of disclosure.
Affected products
- Mozilla Firefox prior to 155
Timeline
- 2026-09-01: disclosed
- 2026-09-01: patched: Fixed in Firefox 155