CVE detail
CVE-2026-16387
Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Buzz score
Why this CVE is surfacing
This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.
Buzz score components · mention 17.9 · diversity 10.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Why it matters now
Mention timeline
- Total mentions
- 5
- within the 30d window
- Peak daily
- 5
- highest bucket
Evidence
Source links by recency
5 source links · newest first
- https://www.mozilla.org/security/advisories/mfsa2026-72/www.mozilla.org
No excerpt available.
Vendor Advisorywww.mozilla.orgJul 21, 2026, 1:17 PM - https://www.mozilla.org/security/advisories/mfsa2026-71/www.mozilla.org
No excerpt available.
Vendor Advisorywww.mozilla.orgJul 21, 2026, 1:17 PM - https://www.mozilla.org/security/advisories/mfsa2026-70/www.mozilla.org
No excerpt available.
Vendor Advisorywww.mozilla.orgJul 21, 2026, 1:17 PM - https://www.mozilla.org/security/advisories/mfsa2026-68/www.mozilla.org
No excerpt available.
Vendor Advisorywww.mozilla.orgJul 21, 2026, 1:17 PM - https://bugzilla.mozilla.org/show_bug.cgi?id=2043200bugzilla.mozilla.org
No excerpt available.
Exploitbugzilla.mozilla.orgJul 21, 2026, 1:17 PM
Exploit code
Public exploit repository references
Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.
0 repository references · best confidence N/A · max 0 stars
Related records
Similar CVEs
6 related CVEs with shared weakness or product evidence
- CVE-2026-16398CVSS 7.5 · High
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
- CVE-2018-5157CVSS 7.5 · High
Same-origin protections for the PDF viewer can be bypassed, allowing a malicious site to intercept messages meant for the viewer. This could allow the site to retrieve PDF files r…
- CVE-2017-7808CVSS 5.3 · Medium
A content security policy (CSP) "frame-ancestors" directive containing origins with paths allows for comparisons against those paths instead of the origin. This results in a cross…
- CVE-2026-74963CVSS 5.4 · Medium
Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 154, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 14…
- CVE-2026-16407CVSS 9.8 · Critical
Mitigation bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
- CVE-2026-16400CVSS 7.5 · High
Information disclosure in the DOM: Security component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.