Threat Intelligence / CVE / CVE-2026-10702

CVE-2026-10702 — Mozilla Firefox

CVSS v3.1 4.3 (MEDIUM) · EPSS 0.5% (higher than 42.5% of all scored CVEs) · Priority 3.9/10 · Published 2026-06-02

As of 2026-07-15, CVE-2026-10702 is a MEDIUM-severity vulnerability in Mozilla Firefox, CVSS v3.1 4.3, EPSS 0.5% (42.5th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-10702, most recently “IonStack: One-Click Firefox JIT-to-Linux-Kernel Root Exploit Chain (CVE-2026-10702 + CVE-2026-43499 "GhostLock") Demonstrated Against Android 17”.

Last updated: 2026-07-15

What is CVE-2026-10702?

JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 151.0.3.

The record classifies CVE-2026-10702 under weakness classes CWE-843, CWE-733. 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 103 days ago.

Severity and exploitation probability

CVSS v3.1 base score
4.3 — MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
EPSS (FIRST)
0.5% probability of exploitation in the next 30 days, higher than 42.5% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
3.9/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-06-02, last modified 2026-07-15

Is CVE-2026-10702 being exploited?

No public exploitation evidence for CVE-2026-10702 is recorded in the sources Threadlinqs tracks — CISA KEV, Exploit-DB, public proof-of-concept repositories and ProjectDiscovery Nuclei — as of 2026-07-15. 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-2026-10702

Vendor advisory: https://www.mozilla.org/security/advisories/mfsa2026-54/. 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-2026-10702

1 tracked threat in the Threadlinqs corpus references CVE-2026-10702, 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-2026-10702 are available via the Threadlinqs MCP server (Purple tier). View plans →

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