🛡️ CVE-2026-16372 — firefox

🟠 CVSS 8.8 — High ⚠️ Exploit Public CWE-269 NVD
8.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Privilege escalation in the DOM: Content Processes component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2026-16372 is classified as CWE-269: Improper Privilege Management. Privileges are assigned, dropped or restored incorrectly, leaving an actor with more access than intended.

Affected software

CVE-2026-16372 is recorded against 2 packages.

  • firefox (fixed in 153.0.0)
  • thunderbird (fixed in 153.0)

Timeline and source

Published on 21 July 2026 and last revised on 24 July 2026. A public exploit is known to exist, which raises the urgency of patching considerably. Record sourced from NVD.

References

bugzilla.mozilla.org
www.mozilla.org
www.mozilla.org

Details

Severity HIGH
CVSS Score 8.8
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE CWE-269
Public Exploit ⚠️ Yes
Source NVD
Published 2026-07-21
Updated 2026-08-11
Modified 2026-07-24
Fix URL N/A

Affected Packages

Software From version Fixed in
firefox — 153.0.0
thunderbird — 153.0

Similar Threats

Exploit Protection

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CVE-2026-16372 carries CVSS 8.8 High rating and a public exploit already exists. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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