CVE-2026-16371: mozilla firefox Improper Privilege Management
CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2026-16371DEBIAN-CVE-2026-16371CGA-26pq-jq2w-fpgvCGA-3gcr-mj8v-v26vCGA-3x7h-583h-pxj5CGA-rjq9-g96r-7jg6CGA-5pj6-3cfg-m3x2CGA-f6jx-r66w-wg55CGA-m788-wjg7-9chcCGA-xrh4-g82w-xwpm
Published 21-07-2026Last modified 01-09-2026
Vulnerability summary
CVE-2026-16371 is a high (CVSS 8.8) Improper Privilege Management vulnerability in mozilla firefox. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 21% of scored vulnerabilities.
CVSS score
8.8/10
010
High · v3.1 (CVE.org)EPSS score
0.30%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 40 · Related 16MGASA-2026-0325MGASA-2026-0326MGASA-2026-0387MGASA-2026-0388OPENSUSE-SU-2026:11329-1OPENSUSE-SU-2026:11358-1OPENSUSE-SU-2026:11359-1OPENSUSE-SU-2026:21519-1OPENSUSE-SU-2026:21713-1RHSA-2026:47101RHSA-2026:47104RHSA-2026:47105RHSA-2026:49621RHSA-2026:49921RHSA-2026:49922RHSA-2026:53444RHSA-2026:53445RHSA-2026:53446RHSA-2026:53453RHSA-2026:53454RHSA-2026:53455RHSA-2026:53475RHSA-2026:54180RHSA-2026:54181RHSA-2026:54182RHSA-2026:54185RHSA-2026:54248RHSA-2026:54249RHSA-2026:54259RHSA-2026:54339SUSE-SU-2026:23115-1SUSE-SU-2026:23137-1SUSE-SU-2026:23411-1SUSE-SU-2026:23590-1SUSE-SU-2026:3200-1SUSE-SU-2026:3221-1SUSE-SU-2026:3546-1SUSE-SU-2026:4140-1SUSE-SU-2026:4156-1SUSE-SU-2026:4268-1CGA-3R5F-WQG3-FJ82
Timeline
- 21-07-2026PublishedVulnerability first disclosed.
- 01-09-2026Last modifiedVulnerability information updated.
Description
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, Thunderbird 140.13, Firefox ESR 140.15, and Thunderbird 140.15.
CVSS metrics
4 scores · 4 sources · 1 versionHigh 8.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST8.8HighCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.30%
Chance of exploitation in the next 30 days
Percentile
21%
Versus all other CVEs
30-day change
0.00 pp
From 0.30% on 19-09-2026
19-09-202619-10-2026
EPSS score0.30%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu8 products
- mozjs102All versions (No fix recorded)
- mozjs115All versions (No fix recorded)
- mozjs38All versions (No fix recorded)
- mozjs52All versions (No fix recorded)
- mozjs68All versions (No fix recorded)
Chainguard4 products
- firefox< 153.0-r0
- firefox-docker-selenium-compat< 153.0-r0
- firefox-esr< 153.0-r0 | < 153.0-r1
- firefox-esr-140< 140.13.0-r0
Debian2 products
- firefox-esr< 140.15.0esr-1~deb12u1 | < 140.15.0esr-1~deb13u1 | < 140.15.0esr-1
- thunderbird< 1:140.15.0esr-1~deb12u1 | < 1:140.15.0esr-1~deb13u1 | < 1:140.13.0esr-1
Mozilla2 products
- firefox< 140.13.0 | < 153.0.0
- thunderbird< 140.13.0 | ≥ 141.0, < 153.0
Wolfi2 products
- firefox< 153.0-r0
- firefox-docker-selenium-compat< 153.0-r0
5 vendors · 18 products
References
12 links- bugzilla.mozilla.org/show_bug.cgi?id=2008369Permissions Required
- www.mozilla.org/security/advisories/mfsa2026-68/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-70/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-71/Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-72/Vendor Advisory
