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CVE-2026-15719— Site isolation issue 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Web浏览器。 Mozilla Firefox 152.0.6之前版本存在安全漏洞，该漏洞源于存在公开可利用的漏洞代码。

AI Predicted 7.8 Difficulty: Trivial EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 4

VendorProduct Version RangeStatus
Mozilla Firefox 115.38≤ 115.* unaffected
140.13≤ 140.* unaffected
152.0.6≤ * unaffected
Mozilla Thunderbird 140.13≤ * unaffected
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I. Basic Information for CVE-2026-15719

Vulnerability Information
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Vulnerability Title
Site isolation issue in the DOM: Navigation component
Source: CVE Program / CVE List V5
Vulnerability Description
We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6, Firefox ESR 115.38, Firefox ESR 140.13, and Thunderbird 140.13.
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Web浏览器。 Mozilla Firefox 152.0.6之前版本存在安全漏洞，该漏洞源于存在公开可利用的漏洞代码。
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 115.38 ~ 115.* -
Mozilla Thunderbird 140.13 ~ * -

II. Public POCs for CVE-2026-15719

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III. Intelligence Information for CVE-2026-15719

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Vendor Advisories for CVE-2026-15719 (4)

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-15719

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