Quick answers
- Is CVE-2026-16397 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-16397 being exploited in the wild.
- How severe is CVE-2026-16397?
- Informational severity, published 21 July 2026.
- Which products and versions are affected?
- Mozilla Firefox for Android before 153.
- Is there a fix for CVE-2026-16397?
- A patch was published on 2026-07-21. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-16397 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-16397?
- Check whether you run Mozilla Firefox for Android 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
A clickjacking vulnerability was discovered in the WebExtensions component of Firefox for Android. The flaw allows an attacker to potentially overlay or frame sensitive browser extension interfaces, leading to UI redress attacks where a user is tricked into performing actions they did not intend. This typically occurs when the application fails to properly implement or enforce frame-busting protections or security headers for extension-related UI. The vulnerability is resolved in Firefox version 153. An attacker would require a user to visit a specially crafted malicious webpage to exploit this issue.
Affected products
- Mozilla Firefox for Android before 153
Timeline
- 2026-07-21: advisory
- 2026-07-21: disclosed
- 2026-07-21: patched