CVE-2026-74939— Privilege escalation in the DOM: Navigation 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是Mozilla基金会开源的一款网页浏览器。 Mozilla Firefox 154之前版本、Firefox ESR 115.39之前版本、Firefox ESR 140.14之前版本和Firefox ESR 153.1之前版本存在安全漏洞，该漏洞源于DOM Navigation组件问题，可能导致权限提升。
Possible ATT&CK Techniques 1 AI
T1203 · Exploitation for Client ExecutionAffected Version Matrix 7
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mozilla | Firefox | 115.39≤ 115.* |
unaffected |
140.14≤ 140.* |
unaffected | ||
153.1≤ 153.* |
unaffected | ||
154≤ * |
unaffected | ||
| Mozilla | Thunderbird | 140.14≤ 140.* |
unaffected |
153.1≤ 153.* |
unaffected | ||
154≤ * |
unaffected |
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I. Basic Information for CVE-2026-74939
Vulnerability Information
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Vulnerability Title
Privilege escalation in the DOM: Navigation component
Source: CVE Program / CVE List V5
Vulnerability Description
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是Mozilla基金会开源的一款网页浏览器。 Mozilla Firefox 154之前版本、Firefox ESR 115.39之前版本、Firefox ESR 140.14之前版本和Firefox ESR 153.1之前版本存在安全漏洞，该漏洞源于DOM Navigation组件问题，可能导致权限提升。
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 | 115.39 ~ 115.* | - |
|
| Mozilla | Thunderbird | 140.14 ~ 140.* | - |
|
II. Public POCs for CVE-2026-74939
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-74939 (7)
Same Patch Batch · Mozilla · 2026-08-18 · 58 CVEs total
| CVE-2026-74952 | Privilege escalation in the Application Update component | |
| CVE-2026-74979 | Mitigation bypass in the Add-ons Manager component | |
| CVE-2026-74982 | Denial-of-service in the Widget component | |
| CVE-2026-74985 | Privilege escalation in the Enterprise Policies component | |
| CVE-2026-74984 | Race condition in the JavaScript Engine component | |
| CVE-2026-74986 | Site isolation issue in the CSS Parsing and Computation component | |
| CVE-2026-74961 | Side-channel in the Web Audio component | |
| CVE-2026-74958 | Information disclosure in the WebRTC component | |
| CVE-2026-74966 | Information disclosure in the Form Autofill component | |
| CVE-2026-74956 | Same-origin policy bypass in the DOM: Service Workers component | |
| CVE-2026-74977 | Integer overflow in the Graphics component | |
| CVE-2026-74951 | Clickjacking issue in Firefox for Android | |
| CVE-2026-74955 | Privilege escalation in the Request Handling component | |
| CVE-2026-74954 | Information disclosure due to side-channel in the Storage: Cache API component | |
| CVE-2026-74937 | Use-after-free in the JavaScript: GC component | |
| CVE-2026-74938 | Mitigation bypass in the JavaScript: GC component | |
| CVE-2026-74950 | Privilege escalation in the Downloads API component | |
| CVE-2026-74947 | Privilege escalation due to invalid pointer in the Graphics component | |
| CVE-2026-74983 | Mitigation bypass in the Data Loss Prevention component | |
| CVE-2026-74990 | Internally found bugs fixed in Thunderbird ESR 140.14, Thunderbird ESR 153.1 and Thunderbi |
Showing top 20 of 58 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Firefox
-
CVE-2026-74989
Internally found bugs fixed in Thunderbird 154 -
CVE-2026-74988
Internally found bugs fixed in Thunderbird ESR 153.1 and Thu -
CVE-2026-74984
Race condition in the JavaScript Engine component -
CVE-2026-74985
Privilege escalation in the Enterprise Policies component -
CVE-2026-74982
Denial-of-service in the Widget component
Same vendor: Mozilla
-
CVE-2026-74989
Internally found bugs fixed in Thunderbird 154 -
CVE-2026-74988
Internally found bugs fixed in Thunderbird ESR 153.1 and Thu -
CVE-2026-74984
Race condition in the JavaScript Engine component -
CVE-2026-74985
Privilege escalation in the Enterprise Policies component -
CVE-2026-74982
Denial-of-service in the Widget component
V. Comments for CVE-2026-74939
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