Full Report
Multiple vulnerabilities have been discovered in Mozilla products, the most severe of which could allow for arbitrary code execution. Mozilla Firefox is a web browser used to access the Internet.Mozilla Firefox ESR is a version of the web browser intended to be deployed in large organizations.Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution. Depending on the privileges associated with the user an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in Mozilla Products (May 2026)
## CVE Details
- **CVE ID:**
- CVE-2026-8090 (Use-after-free)
- CVE-2026-8091 (Boundary condition error)
- CVE-2026-8092 (Memory safety bugs)
- CVE-2026-8093 (Memory safety bugs)
- CVE-2026-8094 (WebRTC issue)
- **CVSS Score:** Not explicitly provided in source (Ranked as "High" Risk for Government/Business)
- **CWE:** CWE-416 (Use After Free), CWE-119 (Memory Safety/Buffer Overflow equivalents), CWE-190 (Boundary Conditions)
## Affected Systems
- **Products:** Mozilla Firefox, Mozilla Firefox ESR
- **Versions:**
- Firefox versions prior to 150.0.2
- Firefox ESR versions prior to 140.10.2
- Firefox ESR versions prior to 115.35.2
- **Configurations:** Systems where users operate with high-level administrative privileges are at greatest risk.
## Vulnerability Description
Multiple security flaws exist within the Mozilla browser suite. The most critical issues involve **Use-After-Free (UAF)** in the Document Object Model (DOM) and **incorrect boundary conditions** in the Audio/Video engine. Additionally, internal memory safety bugs were identified that could be leveraged to corrupt memory. These flaws allow an attacker to bypass security boundaries through a **Drive-by Compromise** tactic, where a user visiting a malicious site triggers the flaw.
## Exploitation
- **Status:** Not exploited in the wild (as of 05/07/2026).
- **Complexity:** Medium (requires user interaction/visit to a malicious site).
- **Attack Vector:** Network (Remote).
## Impact
- **Confidentiality:** High (Ability to view files/data).
- **Integrity:** High (Ability to install programs or delete/change data).
- **Availability:** High (Ability to cause crashes or create new unauthorized accounts).
## Remediation
### Patches
Update to the following versions immediately:
- **Mozilla Firefox:** 150.0.2
- **Mozilla Firefox ESR:** 140.10.2
- **Mozilla Firefox ESR:** 115.35.2
### Workarounds
- **Principle of Least Privilege:** Ensure users are not operating with administrative rights to limit the scope of a potential code execution.
- **Dedicated Accounts:** Use non-privileged accounts for daily activities like web browsing.
## Detection
- **Indicators of Compromise:** Unusual browser crashes, unauthorized program installations, or creation of new user accounts.
- **Detection methods and tools:** Monitor for exploitation of Tactic TA0001 (Initial Access) and Technique T1189 (Drive-by Compromise). Use automated vulnerability scanners to identify outdated browser versions.
## References
- hxxps://www.mozilla.org/en-US/security/advisories/mfsa2026-40/
- hxxps://www.mozilla.org/en-US/security/advisories/mfsa2026-41/
- hxxps://www.mozilla.org/en-US/security/advisories/mfsa2026-42/
- hxxps://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-8090
- hxxps://www.cisecurity.org/advisory/multiple-vulnerabilities-in-mozilla-products-could-allow-for-arbitrary-code-execution_2026-045