CVE-2024-7518Public exploitNetwork attack vector

Content spoofing via persistent select picker overlay

Published Aug 6, 2024 · Updated Oct 29, 2024

Improper UI layering in Mozilla Firefox before 129, Firefox ESR before 128.1, and Thunderbird before 128.1 allows remote attackers to spoof content. SelectChild.sys.mjs unconditionally creates user activation when a select picker closes without an input change, letting script reopen the picker above the fullscreen notice. A malicious site must obtain one user click; it can then obscure the fullscreen exit warning and present attacker-controlled content as a trusted fullscreen page.

CVSS severity6.5
Medium
EPSS probability0.51%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper UI layering in Mozilla Firefox before 129, Firefox ESR before 128.1, and Thunderbird before 128.1 allows remote attackers to spoof content. SelectChild.sys.mjs unconditionally creates user activation when a select picker closes without an input change, letting script reopen the picker above the fullscreen notice. A malicious site must obtain one user click; it can then obscure the fullscreen exit warning and present attacker-controlled content as a trusted fullscreen page.

The record

CVE
CVE-2024-7518
Published
Aug 6, 2024
Updated
Oct 29, 2024
Vendor
Mozilla
Product
Firefox
Classifications
CWE-1021, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 2024Record 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 <129

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <129
Mozilla · Thunderbirdversion=unspecified <128.1
Mozilla · Firefox ESRversion=unspecified <128.1

Published CVSS scores

6.5NVDCVSS: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
T1204.001User Execution: Malicious Link

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo