Vulnerability in Mozilla Firefox (July 1, 2026)

unknownCVE-2026-14241

A vulnerability has been discovered in Mozilla Firefox. It allows an attacker to cause remote arbitrary code execution.

CSIRTS triage

vendor: Mozilla product: Firefox Remote code execution

What: A vulnerability in Mozilla Firefox allows for remote arbitrary code execution.
Who is affected: Users of Mozilla Firefox are affected.
Urgency: Immediate action is required due to the severity of the remote code execution risk.
Action: Update Mozilla Firefox to the latest version to address this vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-07-01
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-0820/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-142410.23% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 14% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-14241	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Mozilla Firefox

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

high[UPDATE] [high] Mozilla Firefox, Firefox ESR and Thunderbird: Multiple vulnerabilitiescert-bund · 2026-07-10
high[UPDATE] [high] Mozilla Firefox and Thunderbird: Multiple vulnerabilitiescert-bund · 2026-07-09
high[UPDATE] [high] Mozilla Firefox: Multiple vulnerabilitiescert-bund · 2026-07-09
medium[NEW] [medium] Mozilla Firefox for iOS: Vulnerability allows display of false informationcert-bund · 2026-07-07
unknownVulnerability in Mozilla Firefox for iOS (July 7, 2026)cert-fr-avis · 2026-07-07
high[UPDATE] [high] Mozilla Firefox: Vulnerability allows code executioncert-bund · 2026-07-02