Full Report
Mozilla security advisory (AV26-924)
Analysis Summary
# Vulnerability: Multiple Security Flaws in Mozilla Firefox and Firefox ESR (AV26-924)
## CVE Details
*Note: The provided source article mentions a collection of security vulnerabilities fixed in these versions but does not list specific individual CVE IDs. Based on the advisory references:*
- **CVE ID:** Multiple (Refer to MFSA2026-90 through MFSA2026-93)
- **CVSS Score:** Range typically includes **High** to **Critical** for Firefox updates.
- **CWE:** Varies (Typically includes Memory Safety, Use-After-Free, and Buffer Overflow vulnerabilities common to browser engines).
## Affected Systems
- **Products:** Firefox and Firefox ESR (Extended Support Release)
- **Versions:**
- Firefox ESR versions prior to 115.41
- Firefox ESR versions prior to 140.16
- Firefox ESR versions prior to 153.3
- Firefox (Standard) versions prior to 156
- **Configurations:** All default installations on Windows, macOS, and Linux.
## Vulnerability Description
While specific technical details for each CVE are contained within the linked Mozilla Foundation Security Advisories, these updates generally address critical memory safety bugs in the browser engine (Gecko). These flaws often involve how the browser processes web content, JavaScript, or media files, which could lead to memory corruption or arbitrary code execution.
## Exploitation
- **Status:** Under Investigation (Historically, Firefox updates address vulnerabilities that range from "found internally" to "active exploitation potential").
- **Complexity:** Medium to High
- **Attack Vector:** Network (Remote/Web-based)
## Impact
- **Confidentiality:** High (Potential for unauthorized data access)
- **Integrity:** High (Potential for arbitrary code execution)
- **Availability:** High (Potential for browser crashing and denial of service)
## Remediation
### Patches
Mozilla has released the following versions to address these vulnerabilities. Users should update immediately:
- **Firefox 156**
- **Firefox ESR 115.41**
- **Firefox ESR 140.16**
- **Firefox ESR 153.3**
### Workarounds
No practical workarounds are available for browser-based vulnerabilities other than updating the software. Users are advised to avoid visiting untrusted websites until the update is applied.
## Detection
- **Indicators of compromise:** Unusual browser crashes, unexpected outgoing network connections to unknown IPs, or unauthorized modifications to browser settings.
- **Detection methods and tools:**
- Audit installed software versions using Endpoint Detection and Response (EDR) tools.
- Check the "About Firefox" section in the browser menu to verify the current version.
## References
- [Mozilla Foundation Security Advisories](https[:]//www[.]mozilla[.]org/en-US/security/advisories/)
- [MFSA2026-90: Firefox 156](https[:]//www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-90/)
- [MFSA2026-91: Firefox ESR 115.41](https[:]//www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-91/)
- [MFSA2026-92: Firefox ESR 140.16](https[:]//www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-92/)
- [MFSA2026-93: Firefox ESR 153.3](https[:]//www[.]mozilla[.]org/en-US/security/advisories/mfsa2026-93/)