CVE-2026-18809: Vulnerability in Mozilla Firefox
CVE-2026-18809 is an information disclosure vulnerability affecting Firefox for Android and Firefox Focus for Android. The flaw could allow unauthorized disclosure of sensitive information. Mozilla fixed this vulnerability in Firefox version 153.0.3. The vulnerability has a CVSS score of 6.5, indicating a medium severity level. No known exploits are reported in the wild. Users are advised to update to the fixed version to mitigate the risk.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-18809) involves information disclosure in Firefox for Android and Firefox Focus for Android. It was reported by the Mozilla Fuzzing Team and is tracked under Bug 2055683. The issue was addressed and fixed in Firefox version 153.0.3. The CVSS 3.1 base score is 6.5, with attack vector network, low attack complexity, no privileges required, user interaction required, scope unchanged, and high confidentiality impact. The vulnerability does not affect integrity or availability.
Potential Impact
Successful exploitation of this vulnerability could lead to unauthorized disclosure of sensitive information on affected Firefox Android browsers. The confidentiality impact is high, but there is no impact on integrity or availability. No active exploitation has been reported.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox for Android version 153.0.3. Users and administrators should update to this version or later to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
CVE-2026-18809: Vulnerability in Mozilla Firefox
Description
CVE-2026-18809 is an information disclosure vulnerability affecting Firefox for Android and Firefox Focus for Android. The flaw could allow unauthorized disclosure of sensitive information. Mozilla fixed this vulnerability in Firefox version 153.0.3. The vulnerability has a CVSS score of 6.5, indicating a medium severity level. No known exploits are reported in the wild. Users are advised to update to the fixed version to mitigate the risk.
CVSS v3.1
Score 6.5medium
Affected software
Mozilla
Firefox
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-18809) involves information disclosure in Firefox for Android and Firefox Focus for Android. It was reported by the Mozilla Fuzzing Team and is tracked under Bug 2055683. The issue was addressed and fixed in Firefox version 153.0.3. The CVSS 3.1 base score is 6.5, with attack vector network, low attack complexity, no privileges required, user interaction required, scope unchanged, and high confidentiality impact. The vulnerability does not affect integrity or availability.
Potential Impact
Successful exploitation of this vulnerability could lead to unauthorized disclosure of sensitive information on affected Firefox Android browsers. The confidentiality impact is high, but there is no impact on integrity or availability. No active exploitation has been reported.
Mitigation Recommendations
Mozilla has released an official fix for this vulnerability in Firefox for Android version 153.0.3. Users and administrators should update to this version or later to remediate the issue. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-08-04T12:31:09.618Z
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-73/","vendor":"Mozilla"}]
Threat ID: 6a71ec42bf8831d539e19d21
Added to database: 08/04/2026, 13:42:26 UTC
Last enriched: 08/11/2026, 18:16:37 UTC
Last updated: 09/18/2026, 22:01:32 UTC
Views: 60
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