CVE-2026-92023
published 2026-09-15CVE-2026-92023: Use-after-free in the XML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156…
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.32%
23.0th percentile
Use-after-free in the XML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 156 | Firefox 156 |
| mozilla | firefox | < 115.41.0 | 115.41.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 116.0 < 140.16.0 | 140.16.0 |
| mozilla | firefox | >= 141.0 < 153.3.0 | 153.3.0 |
| mozilla | firefox | >= 154.0.0 < 156.0.0 | 156.0.0 |
| mozilla | firefox_esr | < Firefox ESR 115.41 | Firefox ESR 115.41 |
| mozilla | firefox_esr | < Firefox ESR 153.3 | Firefox ESR 153.3 |
| mozilla | firefox_esr | < Firefox ESR 140.16 | Firefox ESR 140.16 |
| mozilla | thunderbird | < Thunderbird 156 | Thunderbird 156 |
| mozilla | thunderbird | < Thunderbird 140.16 | Thunderbird 140.16 |
| mozilla | thunderbird | < Thunderbird 153.3 | Thunderbird 153.3 |
| mozilla | thunderbird | < 140.16.0 | 140.16.0 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 141.0 < 153.3.0 | 153.3.0 |
| mozilla | thunderbird | >= 154.0 < 156.0 | 156.0 |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vendor_redhat7.5HIGH
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VulDB
Mozilla Firefox up to 115.40/140.15/153.2/155 XML use after free (WID-SEC-2026-3375)
vuldb·2026-09-22·CVSS 8.8
CVE-2026-92023 [HIGH] Mozilla Firefox up to 115.40/140.15/153.2/155 XML use after free (WID-SEC-2026-3375)
A vulnerability described as critical has been identified in Mozilla Firefox up to 115.40/140.15/153.2/155. Impacted is an unknown function of the component XML. The manipulation results in use after free.
This vulnerability was named CVE-2026-92023. The attack may be performed from remote. There is no available exploit.
Upgrading the affected component is recommended.
GHSA
Use-after-free in the XML component.
ghsa_unreviewed·2026-09-15
CVE-2026-92023 Use-after-free in the XML component.
Use-after-free in the XML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
Red Hat
firefox: thunderbird: Use-after-free in the XML component
vendor_redhat·2026-09-15·CVSS 7.5
CVE-2026-92023 [HIGH] CWE-825 firefox: thunderbird: Use-after-free in the XML component
firefox: thunderbird: Use-after-free in the XML component
Use-after-free in the XML component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Use-after-free in the XML component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: thunderbird (Red Hat Enterprise Lin
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92023
vendor_mozilla
CVE-2026-92023 Mozilla Foundation Security Advisory 2026-94: CVE-2026-92023
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92023
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
Mozilla
Mozilla Foundation Security Advisory 2026-95: CVE-2026-92023
vendor_mozilla
CVE-2026-92023 Mozilla Foundation Security Advisory 2026-95: CVE-2026-92023
Mozilla Foundation Security Advisory 2026-95
CVE: CVE-2026-92023
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-91: CVE-2026-92023
vendor_mozilla
CVE-2026-92023 Mozilla Foundation Security Advisory 2026-91: CVE-2026-92023
Mozilla Foundation Security Advisory 2026-91
CVE: CVE-2026-92023
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.41
Mozilla
Mozilla Foundation Security Advisory 2026-96: CVE-2026-92023
vendor_mozilla
CVE-2026-92023 Mozilla Foundation Security Advisory 2026-96: CVE-2026-92023
Mozilla Foundation Security Advisory 2026-96
CVE: CVE-2026-92023
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-93: CVE-2026-92023
vendor_mozilla
CVE-2026-92023 Mozilla Foundation Security Advisory 2026-93: CVE-2026-92023
Mozilla Foundation Security Advisory 2026-93
CVE: CVE-2026-92023
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-90: CVE-2026-92023
vendor_mozilla
CVE-2026-92023 Mozilla Foundation Security Advisory 2026-90: CVE-2026-92023
Mozilla Foundation Security Advisory 2026-90
CVE: CVE-2026-92023
Product: Firefox
Impact: low
Fixed in: Firefox 156
Mozilla
Mozilla Foundation Security Advisory 2026-92: CVE-2026-92023
vendor_mozilla
CVE-2026-92023 Mozilla Foundation Security Advisory 2026-92: CVE-2026-92023
Mozilla Foundation Security Advisory 2026-92
CVE: CVE-2026-92023
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.16
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2068342https://www.mozilla.org/security/advisories/mfsa2026-90/https://www.mozilla.org/security/advisories/mfsa2026-91/https://www.mozilla.org/security/advisories/mfsa2026-92/https://www.mozilla.org/security/advisories/mfsa2026-93/https://www.mozilla.org/security/advisories/mfsa2026-94/https://www.mozilla.org/security/advisories/mfsa2026-95/https://www.mozilla.org/security/advisories/mfsa2026-96/
2026-09-15
Published