CVE-2026-8965: Vulnerability in Mozilla Firefox
CVE-2026-8965 is an information disclosure vulnerability in the DOM security component of Mozilla Firefox. It was addressed in Firefox version 151 and Thunderbird version 151. The vulnerability has a high CVSS score of 7.5, indicating a significant risk of sensitive information exposure without requiring user interaction or privileges. Mozilla has officially fixed this issue as part of a broader security update that addressed multiple vulnerabilities, including memory safety bugs. There are no known exploits in the wild for this specific vulnerability. Users are advised to update to Firefox 151 or Thunderbird 151 to mitigate the risk.
AI Analysis
Technical Summary
CVE-2026-8965 is an information disclosure vulnerability classified under CWE-200 affecting the DOM security component in Mozilla Firefox. The flaw allows unauthorized disclosure of information, potentially impacting confidentiality. It has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), indicating it is remotely exploitable without privileges or user interaction and results in high confidentiality impact. Mozilla fixed this vulnerability in Firefox 151 and Thunderbird 151 as part of a security advisory (MFSA2026-46 and MFSA2026-50). The vendor advisory confirms the fix and no known active exploitation. This vulnerability is one among multiple security issues resolved in these releases.
Potential Impact
The vulnerability allows remote attackers to disclose sensitive information through the DOM security component without requiring authentication or user interaction. The confidentiality impact is high, which could lead to exposure of sensitive data. However, there are no reports of active exploitation in the wild. The fix in Firefox 151 and Thunderbird 151 mitigates this risk.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 151 and Thunderbird 151. Users and administrators should update to these versions or later to remediate the issue. Since the vendor advisory confirms the fix, no additional mitigation steps are required beyond applying the official updates.
CVE-2026-8965: Vulnerability in Mozilla Firefox
Description
CVE-2026-8965 is an information disclosure vulnerability in the DOM security component of Mozilla Firefox. It was addressed in Firefox version 151 and Thunderbird version 151. The vulnerability has a high CVSS score of 7.5, indicating a significant risk of sensitive information exposure without requiring user interaction or privileges. Mozilla has officially fixed this issue as part of a broader security update that addressed multiple vulnerabilities, including memory safety bugs. There are no known exploits in the wild for this specific vulnerability. Users are advised to update to Firefox 151 or Thunderbird 151 to mitigate the risk.
CVSS v3.1
Score 7.5high
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-8965 is an information disclosure vulnerability classified under CWE-200 affecting the DOM security component in Mozilla Firefox. The flaw allows unauthorized disclosure of information, potentially impacting confidentiality. It has a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N), indicating it is remotely exploitable without privileges or user interaction and results in high confidentiality impact. Mozilla fixed this vulnerability in Firefox 151 and Thunderbird 151 as part of a security advisory (MFSA2026-46 and MFSA2026-50). The vendor advisory confirms the fix and no known active exploitation. This vulnerability is one among multiple security issues resolved in these releases.
Potential Impact
The vulnerability allows remote attackers to disclose sensitive information through the DOM security component without requiring authentication or user interaction. The confidentiality impact is high, which could lead to exposure of sensitive data. However, there are no reports of active exploitation in the wild. The fix in Firefox 151 and Thunderbird 151 mitigates this risk.
Mitigation Recommendations
Mozilla has released official fixes for this vulnerability in Firefox 151 and Thunderbird 151. Users and administrators should update to these versions or later to remediate the issue. Since the vendor advisory confirms the fix, no additional mitigation steps are required beyond applying the official updates.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-05-19T12:30:08.950Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-46/","vendor":"Mozilla"}]
Threat ID: 6a0c677fec166c07b0a99804
Added to database: 05/19/2026, 13:37:03 UTC
Last enriched: 05/26/2026, 20:41:51 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 79
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