CVE-2026-74970
published 2026-08-18CVE-2026-74970: Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
PriorityP425medium5.4CVSS 3.1
AVNACLPRNUIRSUCLILAN
EPSS
0.14%
3.9th percentile
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 154 | Firefox 154 |
| mozilla | firefox | < 153.1.0 | 153.1.0 |
| mozilla | firefox_esr | < Firefox ESR 153.1 | Firefox ESR 153.1 |
| mozilla | thunderbird | < Thunderbird 154 | Thunderbird 154 |
| mozilla | thunderbird | < Thunderbird 153.1 | Thunderbird 153.1 |
| mozilla | thunderbird | < 153.1.0 | 153.1.0 |
CVSS provenance
nvdv3.15.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
vendor_redhat5.4MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
firefox: thunderbird: Site isolation issue in the Graphics component
vendor_redhat·2026-08-18·CVSS 5.4
CVE-2026-74970 [MEDIUM] CWE-501 firefox: thunderbird: Site isolation issue in the Graphics component
firefox: thunderbird: Site isolation issue in the Graphics component
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Site isolation issue in the Graphics 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) - Not affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Not af
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74970
vendor_mozilla
CVE-2026-74970 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74970
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74970
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74970
vendor_mozilla
CVE-2026-74970 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74970
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74970
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74970
vendor_mozilla
CVE-2026-74970 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74970
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74970
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74970
vendor_mozilla
CVE-2026-74970 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74970
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74970
Product: Firefox
Impact: high
Fixed in: Firefox 154
VulDB
Mozilla Firefox prior 153.1/154 Graphics isolation
vuldb·2026-08-25·CVSS 5.4
CVE-2026-74970 [MEDIUM] Mozilla Firefox prior 153.1/154 Graphics isolation
A vulnerability was found in Mozilla Firefox. It has been declared as critical. The affected element is an unknown function of the component Graphics. Such manipulation leads to improper isolation or compartmentalization.
This vulnerability is listed as CVE-2026-74970. The attack may be performed from remote. There is no available exploit.
It is recommended to upgrade the affected component.
GHSA
Site isolation issue in the Graphics component.
ghsa_unreviewed·2026-08-18
CVE-2026-74970 [MEDIUM] CWE-346 Site isolation issue in the Graphics component.
Site isolation issue in the Graphics component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.
No detection rules found.
No public exploits indexed.
2026-08-18
Published