CVE-2026-6753
An attacker can exploit multiple vulnerabilities in Mozilla Thunderbird, Mozilla Firefox ESR, and Mozilla Firefox to escalate privileges, conduct a Denial of Service attack, disclose information, present false information, and bypass security measures.
CSIRTS triage
- What
- Multiple vulnerabilities can be exploited to escalate privileges, conduct a Denial of Service attack, disclose information, present false information, and bypass security measures.
- Who is affected
- Users of Mozilla Thunderbird, Firefox ESR, and Firefox.
- Urgency
- Remediation is urgent due to the high severity and multiple attack vectors.
- Action
- Update to the latest versions of Mozilla Thunderbird, Firefox ESR, and Firefox.
AI-assisted analysis generated from the source advisory — verify against the original.
⚡ Watch CVE-2026-6753
Get an email if CVE-2026-6753 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 23% of all EPSS-scored CVEs.
Advisory coverage (1)
- high[UPDATE] [high] Mozilla Thunderbird, Firefox ESR and Firefox: Multiple vulnerabilitiescert-bund · 2026-07-22
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-6753)