Mozilla Firefox
Mozilla · current 154.0.1
The current version of Mozilla Firefox is 154.0.1 (as of 26/08/2026). patchletter checks the official source daily and emails you every new release.
Actively exploited vulnerabilities
The US cybersecurity agency CISA lists these vulnerabilities in its catalog of Known Exploited Vulnerabilities. Check your version and patch or mitigate promptly.
9.8 critical · over the network, without login · CISA deadline was 5 Nov 24
- CVE-2019-11708Mozilla Firefox and Thunderbird Sandbox Escape Vulnerability
10.0 critical · over the network, without login · CISA deadline was 13 Jun 22
- CVE-2022-26486Mozilla Firefox Use-After-Free Vulnerability
9.6 critical · over the network, without login, needs user action · CISA deadline was 21 Mar 22
- CVE-2019-17026Mozilla Firefox And Thunderbird Type Confusion Vulnerability
8.8 high · over the network, without login, needs user action · CISA deadline was 3 May 22
- CVE-2022-26485Mozilla Firefox Use-After-Free Vulnerability
8.8 high · over the network, without login, needs user action · CISA deadline was 21 Mar 22
- CVE-2013-1690Mozilla Firefox and Thunderbird Denial-of-Service Vulnerability
8.8 high · over the network, without login, needs user action · CISA deadline was 18 Apr 22
- CVE-2019-11707Mozilla Firefox and Thunderbird Type Confusion Vulnerability
8.8 high · over the network, without login, needs user action · CISA deadline was 13 Jun 22
- CVE-2015-4495Mozilla Firefox Security Feature Bypass Vulnerability
8.8 high · over the network, without login, needs user action · CISA deadline was 15 Jun 22
- CVE-2020-6820Mozilla Firefox And Thunderbird Use-After-Free Vulnerability
8.1 high · over the network, without login · CISA deadline was 3 May 22
- CVE-2020-6819Mozilla Firefox And Thunderbird Use-After-Free Vulnerability
8.1 high · over the network, without login · CISA deadline was 3 May 22
- CVE-2016-9079Mozilla Firefox, Firefox ESR, and Thunderbird Use-After-Free Vulnerability
7.5 high · over the network, without login · CISA deadline was 13 Jul 23
- CVE-2013-1675Mozilla Firefox Information Disclosure Vulnerability
6.5 medium · over the network, without login, needs user action · CISA deadline was 24 Mar 22
Source: CISA KEV. The CVE is matched to the product automatically — when in doubt, the linked NVD entry applies.
Mozilla Firefox at a glance
Mozilla Firefox is an independent, open-source browser used across many desktops and in privacy-conscious organizations. Mozilla ships a new release roughly every four weeks plus out-of-band security builds when needed — the same brisk cadence browsers require.
For admins Firefox offers strong central management through policies (policies.json / ADMX) covering updates, extensions and features. Keep the patch window short, since browsers are a primary attack surface. The built-in updater keeps standalone installs current; managed fleets use the enterprise installer plus policy. For environments needing a slower cadence, Firefox ESR is the better fit. Restrict add-ons to a reviewed allowlist, and manage telemetry and sync deliberately.
Version history & changelog · as detected by patchletter
| Version | Channel | Date | Notes |
|---|---|---|---|
| 154.0.1 | STABLE | 26/08/2026 | – |
| 154.0 | STABLE | 19/08/2026 | – |
| 153.0.4 | STABLE | 12/08/2026 | – |
| 153.0.3 | STABLE | 05/08/2026 | – |
| 153.0.1 | STABLE | 29/07/2026 | – |
| 153.0 | STABLE | 22/07/2026 | – |
| 152.0.6 | STABLE | 15/07/2026 | – |
| 152.0.5 | STABLE | 08/07/2026 | – |
Frequently asked questions
- What is the latest version of Mozilla Firefox?
- Mozilla Firefox 154.0.1, released 26/08/2026. patchletter checks the vendor's official source daily for new releases.
- Where can I find the Mozilla Firefox release notes?
- The version history above links to the vendor's official release notes where the vendor publishes them. patchletter deliberately stores no vendor full texts.
- How do I get notified about new Mozilla Firefox updates?
- Free by email: patchletter reports every new release — instantly or bundled as a digest. Unsubscribe anytime with one click.
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