Multiple Vulnerabilities in Mozilla Firefox (July 15, 2026)

unknownCVE-2026-15719 CVE-2026-14906 CVE-2026-15718

Multiple vulnerabilities have been discovered in Mozilla Firefox. They allow an attacker to cause a security policy bypass and an unspecified security issue by the vendor.

CSIRTS triage

vendor: Mozilla product: FirefoxOther

What: Multiple vulnerabilities allow an attacker to cause a security policy bypass and an unspecified security issue by the vendor.
Who is affected: Deployments of Mozilla Firefox are affected.
Urgency: Remediation is urgent due to the potential for security policy bypass.
Action: Apply patches as they become available.

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

⚡ Watch Firefox

Get an email when a new Firefox advisory drops — max one per day, one-click unsubscribe.

Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-07-15
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-0887/

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-2026-157190.34% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all scored CVEs.
Low exploitation riskCVE-2026-149060.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all scored CVEs.
Low exploitation riskCVE-2026-157180.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-15719	coverage & exploitation status	NVD · CVE.org
CVE-2026-14906	coverage & exploitation status	NVD · CVE.org
CVE-2026-15718	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

high[NEW] [high] Mozilla Firefox and Firefox ESR: Multiple vulnerabilitiescert-bund
medium[NEW] [medium] Mozilla Firefox: Multiple vulnerabilities allow unspecified attackcert-bund
unknownMultiple vulnerabilities in Mozilla Thunderbird (July 23, 2026)cert-fr-avis
unknownMozilla Products Multiple Vulnerabilitieshkcert
unknownMultiple vulnerabilities in Mozilla products (July 22, 2026)cert-fr-avis
unknownDSA-6394-1 firefox-esr - security updatedebian
unknownNCSC-2026-0242 [1.00] [M/H] Vulnerabilities fixed in Mozilla Firefoxncsc-nl
unknownMozilla Products Multiple Vulnerabilitieshkcert
mediumCVE-2026-15719: We are aware that exploit code for this is public however we are not aware of any attacks in t…nvd
mediumCVE-2026-15718: We are aware that exploit code for this is public however we are not aware of any attacks in t…nvd
medium[NEW] [medium] Mozilla Firefox: Vulnerability allows file manipulationcert-bund
mediumCVE-2026-14906: Pages with malicious titles could potentially allow saved PDF content to overwrite PDF files o…nvd

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[NEW] [high] Mozilla Firefox and Firefox ESR: Multiple vulnerabilitiescert-bund · 2026-07-31
medium[NEW] [medium] Mozilla Firefox: Multiple vulnerabilities allow unspecified attackcert-bund · 2026-07-31
high[UPDATE] [high] Mozilla Thunderbird, Firefox ESR and Firefox: Multiple vulnerabilitiescert-bund · 2026-07-22
high[UPDATE] [high] Mozilla Firefox, Firefox ESR and Thunderbird: Multiple vulnerabilitiescert-bund · 2026-07-22
high[UPDATE] [high] Mozilla Firefox and Firefox ESR: Multiple vulnerabilitiescert-bund · 2026-07-22
high[UPDATE] [high] Mozilla Firefox and Thunderbird: Multiple vulnerabilitiescert-bund · 2026-07-21