# CVE-2026-124941: Mozilla Firefox information disclosure in Security: RLBox

Source: https://junglewise.ai/threats/cve-2026-124941-information-disclosure-in-the-security-rlbox-component-this  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-10. Updated: 2026-11-10  
License: CC BY 4.0 with a link back

CVE-2026-124941 · Severity: info · Published 2026-11-10

Firefox is a web browser used by millions worldwide to access the internet. An information disclosure vulnerability exists in the RLBox security component that could allow sensitive data to leak to websites or scripts without proper access controls. This vulnerability has been fixed in Firefox 160 and ESR 153.7.

Technologies: [Mozilla Firefox](https://junglewise.ai/threats/technologies/firefox), [Mozilla Firefox ESR](https://junglewise.ai/threats/technologies/firefox-esr). Vendors: [Mozilla](https://junglewise.ai/threats/vendors/mozilla).

## Quick answers

**Is CVE-2026-124941 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-124941 being exploited in the wild.

**How severe is CVE-2026-124941?** Informational severity, published 10 November 2026.

**Which products and versions are affected?** Mozilla Firefox prior to 160; Mozilla Firefox ESR prior to 153.7.

**Is there a fix for CVE-2026-124941?** Yes: fixed in Firefox 160, Firefox ESR 153.7. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-124941 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-124941?** Check whether you run Mozilla Firefox or Mozilla Firefox ESR 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 160, Firefox ESR 153.7

## Technical details

An information disclosure vulnerability exists in the RLBox component of Firefox's security architecture. The vulnerability allows unintended exposure of sensitive information through improper access controls. The advisory does not provide specific details about the attack vector, affected versions prior to the patch, or the exact nature of the leaked data.

## Affected products

- Mozilla Firefox prior to 160
- Mozilla Firefox ESR prior to 153.7

## Timeline

- 2026-11-10: disclosed

## References

- [https://bugzilla.mozilla.org/show_bug.cgi?id=2077405](https://bugzilla.mozilla.org/show_bug.cgi?id=2077405)
- [https://www.mozilla.org/security/advisories/mfsa2026-125/](https://www.mozilla.org/security/advisories/mfsa2026-125/)

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