CVE-2026-84133
published 2026-09-01CVE-2026-84133: Site isolation issue in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird…
PriorityP354critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.18%
8.2th percentile
Site isolation issue in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 155 | Firefox 155 |
| mozilla | firefox | < 153.2.0 | 153.2.0 |
| mozilla | firefox | >= 154.0.0 < 155.0.0 | 155.0.0 |
| mozilla | firefox_esr | < Firefox ESR 153.2 | Firefox ESR 153.2 |
| mozilla | thunderbird | < Thunderbird 153.2 | Thunderbird 153.2 |
| mozilla | thunderbird | < Thunderbird 155 | Thunderbird 155 |
| mozilla | thunderbird | < 153.2.0 | 153.2.0 |
| mozilla | thunderbird | >= 154.0 < 155.0 | 155.0 |
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.
Mozilla
Mozilla Foundation Security Advisory 2026-82: CVE-2026-84133
vendor_mozilla
CVE-2026-84133 Mozilla Foundation Security Advisory 2026-82: CVE-2026-84133
Mozilla Foundation Security Advisory 2026-82
CVE: CVE-2026-84133
Product: Firefox
Impact: high
Fixed in: Firefox 155
Mozilla
Mozilla Foundation Security Advisory 2026-85: CVE-2026-84133
vendor_mozilla
CVE-2026-84133 Mozilla Foundation Security Advisory 2026-85: CVE-2026-84133
Mozilla Foundation Security Advisory 2026-85
CVE: CVE-2026-84133
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.2
Mozilla
Mozilla Foundation Security Advisory 2026-88: CVE-2026-84133
vendor_mozilla
CVE-2026-84133 Mozilla Foundation Security Advisory 2026-88: CVE-2026-84133
Mozilla Foundation Security Advisory 2026-88
CVE: CVE-2026-84133
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.2
Mozilla
Mozilla Foundation Security Advisory 2026-86: CVE-2026-84133
vendor_mozilla
CVE-2026-84133 Mozilla Foundation Security Advisory 2026-86: CVE-2026-84133
Mozilla Foundation Security Advisory 2026-86
CVE: CVE-2026-84133
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 155
VulDB
Mozilla Firefox up to 153.1/154 Push Subscriptions isolation (Nessus ID 342305)
vuldb·2026-09-03
CVE-2026-84133 [CRITICAL] Mozilla Firefox up to 153.1/154 Push Subscriptions isolation (Nessus ID 342305)
A vulnerability identified as critical has been detected in Mozilla Firefox up to 153.1/154. This vulnerability affects unknown code of the component Push Subscriptions. This manipulation causes improper isolation or compartmentalization.
The identification of this vulnerability is CVE-2026-84133. It is possible to initiate the attack remotely. There is no exploit available.
You should upgrade the affected component.
GHSA
Site isolation issue in the DOM: Push Subscriptions component.
ghsa_unreviewed·2026-09-01
CVE-2026-84133 Site isolation issue in the DOM: Push Subscriptions component.
Site isolation issue in the DOM: Push Subscriptions component. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2026-09-01
Published