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CVE-2026-8969— Mitigation bypass in the DOM: Security component

Quick assessment

Affected
Mozilla Firefox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox和Mozilla Thunderbird都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Firefox 151之前版本和Mozilla Thunderbird 151之前版本存在安全漏洞，该漏洞源于DOM: Security组件存在缓解措

AI Predicted 7.5 Difficulty: Easy EPSS 0.29% · P22

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
Mozilla Firefox 151≤ * unaffected
Mozilla Thunderbird 151≤ * unaffected
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I. Basic Information for CVE-2026-8969

Vulnerability Information
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Vulnerability Title
Mitigation bypass in the DOM: Security component
Source: CVE Program / CVE List V5
Vulnerability Description
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox和Mozilla Thunderbird 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Thunderbird都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Firefox 151之前版本和Mozilla Thunderbird 151之前版本存在安全漏洞，该漏洞源于DOM: Security组件存在缓解措
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 151 ~ * -
Mozilla Thunderbird 151 ~ * -

II. Public POCs for CVE-2026-8969

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III. Intelligence Information for CVE-2026-8969

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Vendor Advisories for CVE-2026-8969 (2)

Same Patch Batch · Mozilla · 2026-05-19 · 32 CVEs total

CVE-2026-8960 Spoofing issue in WebExtensions
CVE-2026-8706 Sensitive user data could be leaked to other applications through Reader mode
CVE-2026-8975 Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151
CVE-2026-8974 Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151
CVE-2026-8973 Memory safety bugs fixed in Firefox 151
CVE-2026-8972 Privilege escalation in the WebRTC: Audio/Video component
CVE-2026-8971 Same-origin policy bypass in the Networking: JAR component
CVE-2026-8970 Privilege escalation in the Security component
CVE-2026-8968 Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component
CVE-2026-8967 Information disclosure in the Graphics: WebGPU component
CVE-2026-8966 Information disclosure in the IP Protection component
CVE-2026-8965 Information disclosure in the DOM: Security component
CVE-2026-8964 Spoofing issue in the Popup Blocker component
CVE-2026-8963 Spoofing issue in the Web Speech component
CVE-2026-8962 Mitigation bypass in the DOM: Security component
CVE-2026-8961 Spoofing issue in the Form Autofill component
CVE-2026-8945 Sandbox escape in Firefox and Firefox Focus for Android
CVE-2026-8959 Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component
CVE-2026-8958 Information disclosure, sandbox escape in the Security: Process Sandboxing component
CVE-2026-8957 Privilege escalation in the Enterprise Policies component

Showing top 20 of 32 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-8969

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