CVE-2022-29914Public exploitNetwork attack vector

Browser spoofing via unchecked named-popup reuse

Published Dec 22, 2022 · Updated Apr 15, 2025

UI spoofing in Mozilla Firefox before 100, Firefox ESR before 91.9, and Thunderbird before 91.9 lets remote attackers hide fullscreen warnings. A site reopens a named popup after fullscreen consumes transient user activation; Firefox reuses it without checking activation, allowing it to cover the notification. Exploitation requires attacker-controlled content and two user clicks; Mozilla reproduced the behavior on Windows and Linux but not macOS.

CVSS severity6.5
Medium
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

UI spoofing in Mozilla Firefox before 100, Firefox ESR before 91.9, and Thunderbird before 91.9 lets remote attackers hide fullscreen warnings. A site reopens a named popup after fullscreen consumes transient user activation; Firefox reuses it without checking activation, allowing it to cover the notification. Exploitation requires attacker-controlled content and two user clicks; Mozilla reproduced the behavior on Windows and Linux but not macOS.

The record

CVE
CVE-2022-29914
Published
Dec 22, 2022
Updated
Apr 15, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-1021, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <100

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <100
Mozilla · Thunderbirdversion=unspecified <91.9
Mozilla · Firefox ESRversion=unspecified <91.9

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1021Improper Restriction of Rendered UI Layers or Frames
T1036Masquerading

Public exploit references

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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