[UPDATE] [high] Mozilla Firefox and Firefox ESR: Multiple vulnerabilities

CSIRTS triage

What

An attacker can exploit multiple vulnerabilities in Mozilla Firefox and Firefox ESR to potentially execute arbitrary code, bypass security measures, disclose confidential information, or carry out other unspecified attacks.

Who is affected

Users of Mozilla Firefox and Firefox ESR are affected.

Urgency

Remediation is urgent due to the high severity of the vulnerabilities.

Action

Update to the latest version of Mozilla Firefox or Firefox ESR.

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

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

high

Published

2026-07-22

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1296

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-2026-73200.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 25% of all scored CVEs.
• Low exploitation riskCVE-2026-73210.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 17% of all scored CVEs.
• Low exploitation riskCVE-2026-73220.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all scored CVEs.
• Low exploitation riskCVE-2026-73230.38% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 30% of all scored CVEs.
• Low exploitation riskCVE-2026-73240.30% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 22% of all scored CVEs.

Referenced CVEs

Recent advisories for Mozilla Firefox and

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 Thunderbird: Multiple vulnerabilitiescert-bund · 2026-07-21
• high[UPDATE] [high] Mozilla Firefox: Multiple vulnerabilitiescert-bund · 2026-07-21

More from CERT-Bund (BSI) Security Advisories

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• medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of service2026-07-31
• medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities2026-07-31
• medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow unspecified attack2026-07-31