Full Report
Mozilla security advisory (AV26-604)
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in Mozilla Products (AV26-604)
## CVE Details
- **CVE ID:** Not explicitly listed in the summary advisory (Refer to MFSA 2026-56 through 2026-59 for specific identifiers).
- **CVSS Score:** High (Inferred from standard Mozilla Security Advisory criticality for browser engine updates).
- **CWE:** Typically includes Memory Safety Bugs, Use-after-free, or Type Confusion (Common in Mozilla updates).
## Affected Systems
- **Products:**
- Firefox
- Firefox for iOS
- Firefox ESR (Extended Support Release)
- **Versions:**
- Firefox versions prior to 152
- Firefox for iOS versions prior to 152
- Firefox EST versions prior to 140.12
- Firefox ESR versions prior to 115.37
- **Configurations:** Systems running standard browser installations; cross-platform (Windows, macOS, Linux, iOS).
## Vulnerability Description
While the Canadian Centre for Cyber Security bulletin (AV26-604) serves as a high-level notification, the underlying Mozilla Foundation Security Advisories (MFSA) address various security flaws. Typically, these involve fixes for memory safety vulnerabilities within the browser engine (Gecko) that could potentially be used to crash the browser or execute arbitrary code when processing specially crafted web content.
## Exploitation
- **Status:** Not explicitly stated as exploited in the wild; however, Mozilla patches generally follow internal discovery or researcher disclosures.
- **Complexity:** Medium (Typically requires user interaction, such as visiting a malicious website).
- **Attack Vector:** Network (Remote via web browsing).
## Impact
- **Confidentiality:** High (Potential for data theft if RCE is achieved).
- **Integrity:** High (Potential for unauthorized modification of data).
- **Availability:** High (Potential for application crashes/DoS).
## Remediation
### Patches
Update to the following versions or later:
- **Firefox:** 152
- **Firefox for iOS:** 152
- **Firefox EST:** 140.12
- **Firefox ESR:** 115.37
### Workarounds
- No specific workarounds are provided. Users are strongly advised to apply updates immediately, as browser-based flaws are difficult to mitigate without patching the binary.
## Detection
- **Indicators of Compromise:** Unusual browser crashes, unexpected outgoing network connections to unknown IPs, or unauthorized changes to browser settings.
- **Detection Methods:** Vulnerability scanners can identify outdated versions of the Firefox executable.
## References
- **Vendor Advisories:**
- hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-59/
- hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-58/
- hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-57/
- hxxps[://]www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-56/
- **Source:** hxxps[://]www[.]cyber[.]gc[.]ca/en/alerts-advisories/mozilla-security-advisory-av26-604