CVE-2024-0749Public exploitNetwork attack vector

Phishing via stale popup origin display

Published Jan 23, 2024 · Updated May 22, 2025

Origin spoofing in Mozilla Firefox before 122 and Thunderbird before 115.7 allows remote attackers to display phishing content with a false origin. The site-identity handler processes an onSecurityChange event while a popup is still about:blank, then fails to refresh the identity block after the final location change. A user must visit the phishing page and open its popup, which can falsely label attacker-controlled content as a page stored locally.

CVSS severity4.3
Medium
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

Origin spoofing in Mozilla Firefox before 122 and Thunderbird before 115.7 allows remote attackers to display phishing content with a false origin. The site-identity handler processes an onSecurityChange event while a popup is still about:blank, then fails to refresh the identity block after the final location change. A user must visit the phishing page and open its popup, which can falsely label attacker-controlled content as a page stored locally.

The record

CVE
CVE-2024-0749
Published
Jan 23, 2024
Updated
May 22, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-346, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 23, 2024CVE publishedPublication date reported by the CVE source.
  2. May 22, 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 <122

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <122
Mozilla · Thunderbirdversion=unspecified <115.7

Published CVSS scores

4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
4.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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 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-346Origin Validation Error
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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