PatchSiren cyber security CVE debrief
CVE-2026-18809 Mozilla CVE debrief
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-04T13:17:36.680Z and has not been modified since then. This information disclosure vulnerability affects Firefox for Android and Firefox Focus for Android, patched in Firefox 153.0.3, with a CVSS score of 6.5 (Medium). Users and administrators should verify affected systems and apply patches. The vulnerability allows for potential information disclosure. Limited details are available. Defensive measures include monitoring for potential information disclosure incidents.
- Vendor
- Mozilla
- Product
- Firefox
- CVSS
- MEDIUM 6.5
- CISA KEV
- Not listed in stored evidence
- Original CVE published
- 2026-08-04
- Original CVE updated
- 2026-08-18
- Advisory published
- 2026-08-04
- Advisory updated
- 2026-08-18
Who should care
Users and administrators of Firefox for Android and Firefox Focus for Android should apply the patch to prevent potential information disclosure. This includes operators, platform administrators, vulnerability management teams, and security teams who need to verify affected systems and apply patches.
Technical summary
CVE-2026-18809 is an information disclosure vulnerability in Firefox for Android and Firefox Focus for Android. The vulnerability was fixed in Firefox 153.0.3. The CVSS score is 6.5 (Medium). This vulnerability affects users and administrators of Firefox for Android and Firefox Focus for Android. The vulnerability allows for potential information disclosure. It is recommended that users and administrators verify affected systems and apply patches. The vulnerability has a CVSS score of 6.5, indicating a medium severity level.
Defensive priority
Medium-priority vulnerability in Firefox for Android and Firefox Focus for Android, patched in Firefox 153.0.3.
Recommended defensive actions
- Inventory and verify affected Firefox for Android and Firefox Focus for Android installations.
- Apply Firefox 153.0.3 or later to patched systems.
- Monitor for potential information disclosure incidents.
- Review compensating controls for exposed systems while remediation is scheduled and verified.
- Check relevant monitoring, detection, and logs for exposed assets that need extra review.
- Track exceptions, retest remediated assets, and close the item only after evidence is documented.
- Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.
Evidence notes
Information disclosure vulnerability in Firefox for Android and Firefox Focus for Android, fixed in Firefox 153.0.3. Limited details available. The vulnerability was published on 2026-08-04T13:17:36.680Z and has a CVSS score of 6.5 (Medium). Users and administrators should verify affected systems and apply patches. Defensive measures include monitoring for potential information disclosure incidents.
Official resources
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-04T13:17:36.680Z and has not been modified since then.