CVE-2020-26976
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是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 84之前版本中存在安全漏洞。当一个HTTPS页面被嵌入到一个HTTP paqe中，并且有一个service worker为前者注册了，service worker可以截获对安全页面的请求。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2020-26976
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
When a HTTPS pages was embedded in a HTTP page, and there was a service worker registered for the former, the service worker could have intercepted the request for the secure page despite the iframe not being a secure context due to the (insecure) framing. This vulnerability affects Firefox < 84.
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是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 84之前版本中存在安全漏洞。当一个HTTPS页面被嵌入到一个HTTP paqe中，并且有一个service worker为前者注册了，service worker可以截获对安全页面的请求。
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
II. Public POCs for CVE-2020-26976
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2020-26976 (5)
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https://www.mozilla.org/security/advisories/mfsa2020-54/ x_refsource_MISC
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https://bugzilla.mozilla.org/show_bug.cgi?id=1674343 x_refsource_MISC
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Mailing List Discussions for CVE-2020-26976 (2)
Same Patch Batch · Mozilla · 2021-01-07 · 13 CVEs total
| CVE-2020-26971 | Mozilla Firefox 缓冲区错误漏洞 | |
| CVE-2020-26972 | Mozilla Firefox 资源管理错误漏洞 | |
| CVE-2020-26973 | Mozilla Firefox 安全漏洞 | |
| CVE-2020-26974 | Mozilla Firefox 缓冲区错误漏洞 | |
| CVE-2020-26975 | Mozilla Firefox 安全漏洞 | |
| CVE-2020-26977 | Mozilla Firefox 安全漏洞 | |
| CVE-2020-26978 | Mozilla Firefox 信息泄露漏洞 | |
| CVE-2020-26979 | Mozilla Firefox 输入验证错误漏洞 | |
| CVE-2020-35111 | Mozilla Firefox 安全漏洞 | |
| CVE-2020-35112 | Mozilla Firefox 安全漏洞 | |
| CVE-2020-35113 | Mozilla Firefox 缓冲区错误漏洞 | |
| CVE-2020-35114 | Mozilla Firefox 缓冲区错误漏洞 |
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-2020-26976
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