CVE-2026-100782
published 2026-09-29CVE-2026-100782: Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157…
PriorityP346high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.26%
16.4th percentile
Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 157 | Firefox 157 |
| mozilla | firefox | < 115.42.0 | 115.42.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 116.0 < 140.17.0 | 140.17.0 |
| mozilla | firefox | >= 141.0 < 153.4.0 | 153.4.0 |
| mozilla | firefox | >= 154.0.0 < 157.0.0 | 157.0.0 |
| mozilla | firefox_esr | < Firefox ESR 140.17 | Firefox ESR 140.17 |
| mozilla | firefox_esr | < Firefox ESR 115.42 | Firefox ESR 115.42 |
| mozilla | firefox_esr | < Firefox ESR 153.4 | Firefox ESR 153.4 |
| mozilla | thunderbird | < Thunderbird 157 | Thunderbird 157 |
| mozilla | thunderbird | < Thunderbird 140.17 | Thunderbird 140.17 |
| mozilla | thunderbird | < Thunderbird 153.4 | Thunderbird 153.4 |
| mozilla | thunderbird | < 140.17.0 | 140.17.0 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 141.0 < 153.4.0 | 153.4.0 |
| mozilla | thunderbird | >= 154.0 < 157.0 | 157.0 |
| 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_redhat8.8HIGH
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Red Hat
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component
vendor_redhat·2026-09-29·CVSS 8.8
CVE-2026-100782 [HIGH] CWE-119 firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component
firefox: thunderbird: Privilege escalation due to incorrect boundary conditions in the Graphics component
Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation due to incorrect boundary conditions in the Graphics 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 th
Mozilla
Mozilla Foundation Security Advisory 2026-99: CVE-2026-100782
vendor_mozilla·CVSS 8.8
CVE-2026-100782 [HIGH] Mozilla Foundation Security Advisory 2026-99: CVE-2026-100782
Mozilla Foundation Security Advisory 2026-99
CVE: CVE-2026-100782
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.17
Mozilla
Mozilla Foundation Security Advisory 2026-97: CVE-2026-100782
vendor_mozilla·CVSS 8.8
CVE-2026-100782 [HIGH] Mozilla Foundation Security Advisory 2026-97: CVE-2026-100782
Mozilla Foundation Security Advisory 2026-97
CVE: CVE-2026-100782
Product: Firefox
Impact: low
Fixed in: Firefox 157
Mozilla
Mozilla Foundation Security Advisory 2026-98: CVE-2026-100782
vendor_mozilla·CVSS 8.8
CVE-2026-100782 [HIGH] Mozilla Foundation Security Advisory 2026-98: CVE-2026-100782
Mozilla Foundation Security Advisory 2026-98
CVE: CVE-2026-100782
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 115.42
Mozilla
Mozilla Foundation Security Advisory 2026-101: CVE-2026-100782
vendor_mozilla·CVSS 8.8
CVE-2026-100782 [HIGH] Mozilla Foundation Security Advisory 2026-101: CVE-2026-100782
Mozilla Foundation Security Advisory 2026-101
CVE: CVE-2026-100782
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 157
Mozilla
Mozilla Foundation Security Advisory 2026-102: CVE-2026-100782
vendor_mozilla·CVSS 8.8
CVE-2026-100782 [HIGH] Mozilla Foundation Security Advisory 2026-102: CVE-2026-100782
Mozilla Foundation Security Advisory 2026-102
CVE: CVE-2026-100782
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.17
Mozilla
Mozilla Foundation Security Advisory 2026-103: CVE-2026-100782
vendor_mozilla·CVSS 8.8
CVE-2026-100782 [HIGH] Mozilla Foundation Security Advisory 2026-103: CVE-2026-100782
Mozilla Foundation Security Advisory 2026-103
CVE: CVE-2026-100782
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.4
Mozilla
Mozilla Foundation Security Advisory 2026-100: CVE-2026-100782
vendor_mozilla·CVSS 8.8
CVE-2026-100782 [HIGH] Mozilla Foundation Security Advisory 2026-100: CVE-2026-100782
Mozilla Foundation Security Advisory 2026-100
CVE: CVE-2026-100782
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.4
VulDB
Mozilla Firefox up to 115.41/140.16/153.3/156 Graphics privileges management (WID-SEC-2026-3654)
vuldb·2026-10-03·CVSS 8.8
CVE-2026-100782 [HIGH] Mozilla Firefox up to 115.41/140.16/153.3/156 Graphics privileges management (WID-SEC-2026-3654)
A vulnerability identified as critical has been detected in Mozilla Firefox up to 115.41/140.16/153.3/156. This impacts an unknown function of the component Graphics. This manipulation causes improper privilege management.
This vulnerability appears as CVE-2026-100782. The attack may be initiated remotely. There is no available exploit.
You should upgrade the affected component.
GHSA
Privilege escalation due to incorrect boundary conditions in the Graphics component.
ghsa_unreviewed·2026-09-29
CVE-2026-100782 [HIGH] CWE-119 Privilege escalation due to incorrect boundary conditions in the Graphics component.
Privilege escalation due to incorrect boundary conditions in the Graphics component. This vulnerability was fixed in Firefox ESR 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2068456https://www.mozilla.org/security/advisories/mfsa2026-100/https://www.mozilla.org/security/advisories/mfsa2026-101/https://www.mozilla.org/security/advisories/mfsa2026-102/https://www.mozilla.org/security/advisories/mfsa2026-103/https://www.mozilla.org/security/advisories/mfsa2026-97/https://www.mozilla.org/security/advisories/mfsa2026-98/https://www.mozilla.org/security/advisories/mfsa2026-99/
2026-09-29
Published