Threat Intelligence / CVE / CVE-2026-15719

CVE-2026-15719 — Mozilla Firefox

CVSS v3.1 5.4 (MEDIUM) · EPSS 0.1% (higher than 3.2% of all scored CVEs) · Priority 2.8/10 · Published 2026-07-14

As of 2026-07-14, CVE-2026-15719 is a MEDIUM-severity vulnerability in Mozilla Firefox, CVSS v3.1 5.4, EPSS 0.1% (3.2th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-15719, most recently “Multi-Vendor Critical Patch Roundup: Firefox 152.0.6, Chrome 150, Adobe ColdFusion/Commerce/AEM (APSB26-68/73/74), and VMware Avi Load Balancer (VMSA-2026-0005)”.

Last updated: 2026-07-14

What is CVE-2026-15719?

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.

Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs a user to take an action first. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 60 days ago.

Severity and exploitation probability

CVSS v3.1 base score
5.4 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS (FIRST)
0.1% probability of exploitation in the next 30 days, higher than 3.2% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
2.8/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-07-14

Is CVE-2026-15719 being exploited?

No public exploitation evidence for CVE-2026-15719 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-14. That is an absence of evidence in those feeds, not a guarantee that the vulnerability is unexploited.

Affected products and versions

How to fix CVE-2026-15719

Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-67/. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2026-15719

1 tracked threat in the Threadlinqs corpus references CVE-2026-15719, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories. Last verified by Threadlinqs on . This product uses the NVD API but is not endorsed or certified by the NVD.

Other references

Full detection coverage & IOCs for threats exploiting CVE-2026-15719 are available via the Threadlinqs MCP server (Purple tier). View plans →

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