CVE-2026-74935
published 2026-08-18CVE-2026-74935: Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1…
PriorityP346high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.31%
23.3th percentile
Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.
Affected
16 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 154 | Firefox 154 |
| mozilla | firefox | < 115.39.0 | 115.39.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 116.0 < 140.14.0 | 140.14.0 |
| mozilla | firefox | >= 141.0 < 153.1.0 | 153.1.0 |
| mozilla | firefox_esr | < Firefox ESR 140.14 | Firefox ESR 140.14 |
| mozilla | firefox_esr | < Firefox ESR 153.1 | Firefox ESR 153.1 |
| mozilla | firefox_esr | < Firefox ESR 115.39 | Firefox ESR 115.39 |
| mozilla | thunderbird | < Thunderbird 140.14 | Thunderbird 140.14 |
| mozilla | thunderbird | < Thunderbird 153.1 | Thunderbird 153.1 |
| mozilla | thunderbird | < Thunderbird 154 | Thunderbird 154 |
| mozilla | thunderbird | < 140.14.0 | 140.14.0 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 141.0 < 153.1.0 | 153.1.0 |
| 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
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.
VulDB
Mozilla Firefox up to 115.38/140.13/153/153.0 Networking privileges management
vuldb·2026-08-23·CVSS 8.8
CVE-2026-74935 [HIGH] Mozilla Firefox up to 115.38/140.13/153/153.0 Networking privileges management
A vulnerability was found in Mozilla Firefox up to 115.38/140.13/153/153.0. It has been rated as critical. This impacts an unknown function of the component Networking. Performing a manipulation results in improper privilege management.
This vulnerability is reported as CVE-2026-74935. The attack is possible to be carried out remotely. No exploit exists.
Upgrading the affected component is advised.
GHSA
Privilege escalation in the DOM: Networking component.
ghsa_unreviewed·2026-08-18
CVE-2026-74935 [HIGH] CWE-269 Privilege escalation in the DOM: Networking component.
Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.
Red Hat
firefox: thunderbird: Privilege escalation in the DOM: Networking component
vendor_redhat·2026-08-18·CVSS 8.8
CVE-2026-74935 [HIGH] CWE-266 firefox: thunderbird: Privilege escalation in the DOM: Networking component
firefox: thunderbird: Privilege escalation in the DOM: Networking component
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the DOM: Networking 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 Linux 10) - Affected
Package: firefox (Red Hat Enterprise Linux 6) - Out of support scope
Package: thunderbird (Red Hat Enterprise Linux 6) - Out of support scope
Pac
Mozilla
Mozilla Foundation Security Advisory 2026-76: CVE-2026-74935
vendor_mozilla
CVE-2026-74935 Mozilla Foundation Security Advisory 2026-76: CVE-2026-74935
Mozilla Foundation Security Advisory 2026-76
CVE: CVE-2026-74935
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.14
Mozilla
Mozilla Foundation Security Advisory 2026-79: CVE-2026-74935
vendor_mozilla
CVE-2026-74935 Mozilla Foundation Security Advisory 2026-79: CVE-2026-74935
Mozilla Foundation Security Advisory 2026-79
CVE: CVE-2026-74935
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.14
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74935
vendor_mozilla
CVE-2026-74935 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74935
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74935
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74935
vendor_mozilla
CVE-2026-74935 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74935
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74935
Product: Firefox
Impact: high
Fixed in: Firefox 154
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74935
vendor_mozilla
CVE-2026-74935 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74935
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74935
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74935
vendor_mozilla
CVE-2026-74935 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74935
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74935
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-75: CVE-2026-74935
vendor_mozilla
CVE-2026-74935 Mozilla Foundation Security Advisory 2026-75: CVE-2026-74935
Mozilla Foundation Security Advisory 2026-75
CVE: CVE-2026-74935
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.39
No detection rules found.
No public exploits indexed.
Hackernews
⚡ Weekly Recap: AI-Powered PLC Attacks, GitLab Attacks, Stripe Key Leaks and More
blogs_hackernews·2026-08-24
CVE-2026-19478 ⚡ Weekly Recap: AI-Powered PLC Attacks, GitLab Attacks, Stripe Key Leaks and More
Home
Threat Intelligence
Vulnerabilities
Cyber Attacks
Webinars
Expert Insights
Awards
Webinars
Awards
Free eBooks
About THN
Jobs
Advertise with us
## ⚡ Weekly Recap: AI-Powered PLC Attacks, GitLab Attacks, Stripe Key Leaks and More
A package gets installed. A login prompt opens. A box sits exposed to the internet. Nothing looks unusual yet.
That’s roughly the mood this week. Trusted tools turn hostile, old weak spots get fresh attention, AI makes exploit work cheaper, and researchers keep finding attacks that sound harder than they actually are.
Plenty to clean up. Here’s the short version.
## ⚡ Threat of the Week
U.S. Warns of AI-Powered Attacks on Siemens PLCs — Threat actors are using AI to write exploit scripts targeting internet-exposed Siemens S7 Series program
Bugzilla
CVE-2026-74935 firefox: thunderbird: Privilege escalation in the DOM: Networking component
bugzilla·2026-08-18·CVSS 8.8
CVE-2026-74935 [HIGH] CVE-2026-74935 firefox: thunderbird: Privilege escalation in the DOM: Networking component
CVE-2026-74935 firefox: thunderbird: Privilege escalation in the DOM: Networking component
Privilege escalation in the DOM: Networking component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, and Firefox ESR 153.1.
https://bugzilla.mozilla.org/show_bug.cgi?id=2051013https://www.mozilla.org/security/advisories/mfsa2026-74/https://www.mozilla.org/security/advisories/mfsa2026-75/https://www.mozilla.org/security/advisories/mfsa2026-76/https://www.mozilla.org/security/advisories/mfsa2026-77/https://www.mozilla.org/security/advisories/mfsa2026-78/https://www.mozilla.org/security/advisories/mfsa2026-79/https://www.mozilla.org/security/advisories/mfsa2026-80/
2026-08-18
Published