CVE-2026-8972Network attack vector

Privilege escalation via undisclosed WebRTC mechanism

Published May 19, 2026 · Updated May 19, 2026

Privilege escalation in Mozilla Firefox and Thunderbird before 151 allows remote attackers to gain elevated privileges via WebRTC handling. Mozilla has not published the wrong operation within the WebRTC Audio/Video component; the referenced security bug remains access-restricted. Exploitation requires user interaction with attacker-controlled network content, and Thunderbird email reading is generally protected because scripting is disabled.

CVSS severity8.8
High
EPSS probability0.33%
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 151 allows remote attackers to gain elevated privileges via WebRTC handling. Mozilla has not published the wrong operation within the WebRTC Audio/Video component; the referenced security bug remains access-restricted. Exploitation requires user interaction with attacker-controlled network content, and Thunderbird email reading is generally protected because scripting is disabled.

The record

CVE
CVE-2026-8972
Published
May 19, 2026
Updated
May 19, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-269, T1068
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 19, 2026CVE publishedPublication date reported by the CVE source.
  2. May 19, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
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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