CVE-2023-6867Public exploitNetwork attack vector

Permission grant via popup-transition clickjacking

Published Dec 19, 2023 · Updated Feb 13, 2025

Clickjacking in Firefox before 121 and Firefox ESR before 115.6 allows remote attackers to trick users into granting site permissions. When a popup closes, the parent window's permission prompt regains focus without restarting its anti-clickjacking delay, allowing an enabled grant button to appear beneath an ongoing click. The attack requires a user to open a crafted page and click during the popup transition; it grants only the permission shown by the prompt.

CVSS severity6.1
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Clickjacking in Firefox before 121 and Firefox ESR before 115.6 allows remote attackers to trick users into granting site permissions. When a popup closes, the parent window's permission prompt regains focus without restarting its anti-clickjacking delay, allowing an enabled grant button to appear beneath an ongoing click. The attack requires a user to open a crafted page and click during the popup transition; it grants only the permission shown by the prompt.

The record

CVE
CVE-2023-6867
Published
Dec 19, 2023
Updated
Feb 13, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-1021, CAPEC-103, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 19, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <121

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <121
Mozilla · Firefox ESRversion=unspecified <115.6

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 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 exploitPublished

Weakness, pattern, technique

CWE-1021Improper Restriction of Rendered UI Layers or Frames
CAPEC-103Clickjacking
T1204User Execution

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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