Quick answers
- Is CVE-2026-121843 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-121843 being exploited in the wild.
- How severe is CVE-2026-121843?
- Informational severity, published 9 November 2026.
- Which products and versions are affected?
- Mozilla Firefox for iOS before 160.0.
- Is there a fix for CVE-2026-121843?
- Yes: fixed in Firefox for iOS 160.0. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-121843 attacked?
- It is attacked with local access, in a web application.
- Am I affected by CVE-2026-121843?
- Check whether you run Mozilla Firefox for iOS 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.
How to fix
- Fixed in: Firefox for iOS 160.0
Technical details
A privilege escalation flaw exists in Firefox for iOS that allows an attacker to elevate their privileges within the application or system context. The vulnerability requires some level of access or user interaction to exploit. Mozilla patched this issue in version 160.0.
Affected products
- Mozilla Firefox for iOS before 160.0
Timeline
- 2026-11-09: disclosed
- 2026-11-09: patched: fixed in Firefox for iOS 160.0