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CVE-2026-8955— Privilege escalation in the DOM: Workers component

AI Predicted 7.8 Difficulty: Moderate EPSS 0.04% · P14

Affected Version Matrix 4

VendorProductVersion RangeStatus
MozillaFirefox140.11≤ 140.*unaffected
151≤ *unaffected
MozillaThunderbird140.11≤ 140.*unaffected
151≤ *unaffected
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I. Basic Information for CVE-2026-8955

Vulnerability Information
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Vulnerability Title
Privilege escalation in the DOM: Workers component
Source: NVD (National Vulnerability Database)
Vulnerability Description
Privilege escalation in the DOM: Workers component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mozilla多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox等都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。 Mozilla多款产品存在安全漏洞，该漏洞源于DOM: Workers组件存在权限提升。以下产品及版本受到影响：Firefox 151之前版本、Firefox ESR 1
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

VendorProductAffected VersionsCPESubscribe
MozillaFirefox 140.11 ~ 140.* -
MozillaThunderbird 140.11 ~ 140.* -

II. Public POCs for CVE-2026-8955

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III. Intelligence Information for CVE-2026-8955

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Vendor Advisories for CVE-2026-8955 (4)

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

CVE-2026-8961Spoofing issue in the Form Autofill component
CVE-2026-8706Sensitive user data could be leaked to other applications through Reader mode
CVE-2026-8975Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151
CVE-2026-8974Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151
CVE-2026-8973Memory safety bugs fixed in Firefox 151
CVE-2026-8972Privilege escalation in the WebRTC: Audio/Video component
CVE-2026-8971Same-origin policy bypass in the Networking: JAR component
CVE-2026-8970Privilege escalation in the Security component
CVE-2026-8969Mitigation bypass in the DOM: Security component
CVE-2026-8968Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component
CVE-2026-8967Information disclosure in the Graphics: WebGPU component
CVE-2026-8966Information disclosure in the IP Protection component
CVE-2026-8965Information disclosure in the DOM: Security component
CVE-2026-8964Spoofing issue in the Popup Blocker component
CVE-2026-8963Spoofing issue in the Web Speech component
CVE-2026-8962Mitigation bypass in the DOM: Security component
CVE-2026-8945Sandbox escape in Firefox and Firefox Focus for Android
CVE-2026-8960Spoofing issue in WebExtensions
CVE-2026-8959Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component
CVE-2026-8958Information disclosure, sandbox escape in the Security: Process Sandboxing 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-2026-8955

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