CVE-2026-100829
published 2026-09-29CVE-2026-100829: Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
PriorityP349critical9.6CVSS 3.1
AVNACLPRNUIRSCCHIHAH
EPSS
0.24%
13.9th percentile
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 157 | Firefox 157 |
| mozilla | firefox | < 153.4.0 | 153.4.0 |
| mozilla | firefox | >= 154.0.0 < 157.0.0 | 157.0.0 |
| mozilla | firefox_esr | < Firefox ESR 153.4 | Firefox ESR 153.4 |
| mozilla | thunderbird | < Thunderbird 153.4 | Thunderbird 153.4 |
| mozilla | thunderbird | < Thunderbird 157 | Thunderbird 157 |
| mozilla | thunderbird | < 153.4.0 | 153.4.0 |
| mozilla | thunderbird | >= 154.0 < 157.0 | 157.0 |
CVSS provenance
nvdv3.19.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
vendor_redhat9.6CRITICAL
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Red Hat
firefox: Mitigation bypass in the DOM: Security component
vendor_redhat·2026-09-29·CVSS 9.6
CVE-2026-100829 [CRITICAL] CWE-693 firefox: Mitigation bypass in the DOM: Security component
firefox: Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Mitigation bypass in the DOM: Security component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Mitigation: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Package: firefox (Red Hat Enterprise Linux 10) - Not affe
Mozilla
Mozilla Foundation Security Advisory 2026-103: CVE-2026-100829
vendor_mozilla
CVE-2026-100829 Mozilla Foundation Security Advisory 2026-103: CVE-2026-100829
Mozilla Foundation Security Advisory 2026-103
CVE: CVE-2026-100829
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.4
Mozilla
Mozilla Foundation Security Advisory 2026-100: CVE-2026-100829
vendor_mozilla
CVE-2026-100829 Mozilla Foundation Security Advisory 2026-100: CVE-2026-100829
Mozilla Foundation Security Advisory 2026-100
CVE: CVE-2026-100829
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.4
Mozilla
Mozilla Foundation Security Advisory 2026-101: CVE-2026-100829
vendor_mozilla
CVE-2026-100829 Mozilla Foundation Security Advisory 2026-101: CVE-2026-100829
Mozilla Foundation Security Advisory 2026-101
CVE: CVE-2026-100829
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 157
Mozilla
Mozilla Foundation Security Advisory 2026-97: CVE-2026-100829
vendor_mozilla
CVE-2026-100829 Mozilla Foundation Security Advisory 2026-97: CVE-2026-100829
Mozilla Foundation Security Advisory 2026-97
CVE: CVE-2026-100829
Product: Firefox
Impact: low
Fixed in: Firefox 157
GHSA
Mitigation bypass in the DOM: Security component.
ghsa_unreviewed·2026-09-29
CVE-2026-100829 Mitigation bypass in the DOM: Security component.
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4 and Firefox 157.
No detection rules found.
No public exploits indexed.
2026-09-29
Published