CVE-2026-4684 describes a high-severity race condition and use-after-free vulnerability in the Graphics: WebRender component, impacting various versions of Mozilla Firefox and Thunderbird. With a CVSS score of 7.5 HIGH, exploitation requires user interaction and high attack complexity, but could result in significant compromise of confidentiality, integrity, and availability. Currently, there is no indication of active exploitation, no public exploit code available, and minimal community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 115.34.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* | ||
< 149.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* | ||
>= 128.0, < 140.9.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.2 Mastodon, and 0.1 GitHub mentions.
The average CVE in this peer group has 0.6 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.