Is CVE-2026-15718 in the CISA KEV catalog?

No. CVE-2026-15718 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-15718?

CVE-2026-15718 has a CVSS v3 base score of 4.3 (MEDIUM).

What is the EPSS score for CVE-2026-15718?

CVE-2026-15718 has an EPSS score of 0.16% (5th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-15718?

Upgrade firefox on debian unstable to 152.0.6-1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2026-15718

MEDIUM

4.3

CVSS v3

NVD

Description

We are aware that exploit code for this is public however we are not aware of any attacks in the wild abusing this flaw. This vulnerability was fixed in Firefox 152.0.6 and Firefox ESR 140.13.

CWE-763

How to fix

Remediation Available

firefoxDebian

Fixed in:152.0.6-1CVE-2026-15718

DeveloperEditionWindows application

Affected:152.0.6Fixed in:152.0.6Mozilla

Mozilla Firefox (en-US)Windows application

Affected:152.0.6Fixed in:152.0.6Mozilla

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Exploit Intelligence

0.16%probability of exploitation in 30 days

5thpercentile

Low risk: more likely to be exploited than 5% of all known CVEs.

References

Vendor Advisory1

mozilla.org

Other references2

Related Vulnerabilities

Other CWE-763 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2007-4367	High	9.3	8.2%	-	Fix
CVE-2015-2695	Medium	5.0	6.2%	-	Fix
CVE-2013-4695	High	7.8	5.3%	-	-
CVE-2020-36224	High	7.5	4.3%	-	Fix
CVE-2022-31625	High	8.1	3.4%	-	Fix
CVE-2021-42377	Critical	9.8	3.4%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-07-21.