Full Report
Mozilla security advisory (AV26-211)
Analysis Summary
# Vulnerability: Multiple High-Severity Flaws in Mozilla Firefox
## CVE Details
- **CVE ID:** CVE-2026-211-01 (Generic placeholder based on Advisory AV26-211; see Note below)
- **CVSS Score:** 8.8 (High) - *Estimated based on typical browser RCE vulnerabilities*
- **CWE:** CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer), CWE-416 (Use After Free)
*Note: The primary advisory (AV26-211) serves as a roll-up for multiple vulnerabilities addressed in the Firefox 148.0.2 release. Specific CVE identifiers typically include memory safety bugs (MFSA2026-19).*
## Affected Systems
- **Products:** Mozilla Firefox (Standard Release)
- **Versions:** All versions prior to 148.0.2
- **Configurations:** Systems processing untrusted web content (standard browsing)
## Vulnerability Description
The update addresses several security flaws including memory safety bugs and potential logic errors. The most severe of these vulnerabilities involve memory corruption issues that could occur during the processing of web content. If an attacker can successfully trigger these flaws, they may be able to execute arbitrary code within the context of the browser process (sandboxed).
## Exploitation
- **Status:** Not currently reported as exploited in the wild.
- **Complexity:** Medium (Requires crafting specific malicious web content).
- **Attack Vector:** Network (Remote/Web-based).
## Impact
- **Confidentiality:** High
- **Integrity:** High
- **Availability:** High
## Remediation
### Patches
- **Firefox 148.0.2:** Users should update to version 148.0.2 or later immediately.
- **Update Path:** Navigate to `Menu` -> `Help` -> `About Firefox` to trigger the automated update mechanism.
### Workarounds
- There are no practical workarounds for these vulnerabilities. Maintaining up-to-date browser software is the primary defense.
- **General Mitigation:** Avoid visiting untrusted or suspicious websites and implement robust endpoint detection.
## Detection
- **Indicators of Compromise:** Unusual browser crashes, unexpected file system modifications initiated by the browser process, or unauthorized network connections to unknown IP addresses.
- **Detection Methods:** Enterprise environments should monitor for outdated Firefox versions using asset management tools or vulnerability scanners (e.g., Nessus, Qualys).
## References
- Mozilla Foundation Security Advisory: hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-19/
- Canadian Centre for Cyber Security Advisory: hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/mozilla-security-advisory-av26-211
- Mozilla Security Home: hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/