CVE-2026-15718: Mozilla Firefox

What is CVE-2026-15718?

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 140.13, and Thunderbird 140.13.

CVSS4.3 NVD 3.1

SeverityMEDIUM

ExploitationNo exploitation reported

EPSS<1% · P40

Triage statusNo Known Exploit

ActionSchedule for next cycle

CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CWECWE-763

NVD published2026-07-14

NVD last modified2026-07-22

Timeline

2026-07-14Published to the U.S. National Vulnerability Database (NVD)
2026-07-16First covered in a defend.network daily briefing
2026-07-22NVD record last updated

Affected product

Mozilla Firefox

References

Referenced in our briefings & reports

Microsoft SharePoint, Windows zero-days actively exploited; Zoom account takeover critical (2026-07-16)

Browse all tracked CVEs in the defend.network CVE database →

🤖 This CVE page is generated by defend.network from NVD, CISA KEV, EPSS, and our verified daily briefings. Severity and exploitation data come from official sources; always verify remediation steps against the official vendor advisory before acting in production.

What is CVE-2026-15718?

Timeline

Affected product

References

Referenced in our briefings & reports

Get Critical CVE Alerts