CVE-2026-16379

Privilege escalation in DOM content processes

Published Jul 21, 2026 · Updated Jul 21, 2026

Privilege escalation in Mozilla Firefox and Thunderbird before 153 and their ESR editions before 140.13 allows attackers to gain privileges. Mozilla has not published the faulty operation in the DOM Content Processes component, and the linked security bug remains access-restricted. The public advisories do not disclose required privileges, user interaction, delivery vector, or the scope of elevated privileges.

CVSS severityUnavailable
Unscored
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Privilege escalation in Mozilla Firefox and Thunderbird before 153 and their ESR editions before 140.13 allows attackers to gain privileges. Mozilla has not published the faulty operation in the DOM Content Processes component, and the linked security bug remains access-restricted. The public advisories do not disclose required privileges, user interaction, delivery vector, or the scope of elevated privileges.

The record

CVE
CVE-2026-16379
Published
Jul 21, 2026
Updated
Jul 21, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-269, T1068
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-269Improper Privilege Management
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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