Secuno
ENNL
Book demo

CVE-2026-92038

Mozilla Firefox vulnerability

9.1 CRITICALEPSS 0.32%
  1. Published15 Sept 2026

Description

Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Mozilla Firefox≥ 154.0.0 < 156.0.0 · < 153.3.0
Mozilla Thunderbird≥ 154.0 < 156.0 · < 153.3.0

Remediation

Fixed in
Mozilla Firefox≥ 156.0.0
Mozilla Thunderbird≥ 156.0

References

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

CVE-2026-843198.3
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1, the regular…
CVE-2026-843188.8
Nginx UI is a web user interface for the Nginx web server. From 2.0.0-rc.6 until 2.4.1,…
CVE-2026-843178.8
Nginx UI is a web user interface for the Nginx web server. Prior to 2.4.1,…
CVE-2026-169169.1
IBM Security Verify Access 10.0 through 10.0.9.2 and IBM Verify Identity Access 11.0…
CVE-2026-976788.8
IBM Langflow OSS 1.0.0 through 1.12.2 could allow a remote authenticated attacker to…
CVE-2026-976738.8
IBM Langflow OSS 1.0.0 through 1.12.2 could allow a remote authenticated attacker to…

Frequently asked

Is CVE-2026-92038 being actively exploited?

CVE-2026-92038 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.32%.

How severe is CVE-2026-92038?

CVE-2026-92038 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.32% probability of exploitation.

Which products are affected by CVE-2026-92038?

Affected products include Mozilla Firefox, Mozilla Thunderbird.

How do I fix CVE-2026-92038?

Upgrade affected software to a fixed version, for example Mozilla Firefox 156.0.0, Mozilla Thunderbird 156.0 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-92038 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

See how prioritisation worksBook a demo

Get Patch this first every Monday

Five vulnerabilities that matter this week, ranked on real exploitation. Plain language, one email, no spam.

You can unsubscribe with one click from every issue. We handle your details as described in our privacy policy.

Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.