# CVE-2026-121841: Firefox for iOS information disclosure

Source: https://junglewise.ai/threats/cve-2026-121841-other-issue-in-firefox-for-ios-this-vulnerability-was-fixed-in  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-09. Updated: 2026-11-09  
License: CC BY 4.0 with a link back

CVE-2026-121841 · Severity: info · Published 2026-11-09

Firefox for iOS contains an information disclosure vulnerability that could allow an attacker to access sensitive data. The issue was fixed in version 160.0, and users should update immediately to protect their privacy and security.

Technologies: [Mozilla Firefox for iOS](https://junglewise.ai/threats/technologies/firefox-for-ios). Vendors: [Mozilla](https://junglewise.ai/threats/vendors/mozilla).

## Quick answers

**Is CVE-2026-121841 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-121841 being exploited in the wild.

**How severe is CVE-2026-121841?** Informational severity, published 9 November 2026.

**Which products and versions are affected?** Mozilla Firefox for iOS prior to 160.0.

**Is there a fix for CVE-2026-121841?** 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-2026-121841 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-121841?** 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

An information disclosure vulnerability exists in Firefox for iOS. The exact attack vector and preconditions are not detailed in available sources, but the advisory indicates the issue has been resolved in version 160.0. Users running older versions remain vulnerable.

## Affected products

- Mozilla Firefox for iOS prior to 160.0

## References

- [https://bugzilla.mozilla.org/show_bug.cgi?id=2081874](https://bugzilla.mozilla.org/show_bug.cgi?id=2081874)
- [https://www.mozilla.org/security/advisories/mfsa2026-124/](https://www.mozilla.org/security/advisories/mfsa2026-124/)

## Related threats

- [Mozilla Firefox for iOS privilege escalation](https://junglewise.ai/threats/cve-2026-121843-privilege-escalation-in-firefox-for-ios-this-vulnerability-was)
- [Mozilla Firefox for iOS privilege escalation in Reader View](https://junglewise.ai/threats/cve-2026-121842-privilege-escalation-in-the-reader-view-component-in-firefox-for)
- [Firefox for iOS FaceTime protocol handler spoofing](https://junglewise.ai/threats/cve-2026-116632-a-malicious-web-page-could-insert-arbitrary-text-into-the)
- [Firefox for iOS external protocol handler spoofing via tel link](https://junglewise.ai/threats/cve-2026-116631-a-malicious-web-page-could-open-a-tel-link-in-a-window-that-was)
- [Firefox for iOS XSS via HTML language attribute in Translation Services](https://junglewise.ai/threats/cve-2026-103418-firefox-for-ios-directly-interpolated-the-page-s-html-language)