CVE-2024-0747Public exploitNetwork attack vector

CSP bypass via unsafe iframe policy inheritance

Published Jan 23, 2024 · Updated May 22, 2025

CSP bypass in Firefox before 122, Firefox ESR before 115.7, and Thunderbird before 115.7 allows remote attackers to run inline script via an iframe. Document::Open incorrectly treats the implicit document.open() from document.write() as a fresh about:blank navigation, discarding the child's meta CSP and inheriting the parent's unsafe-inline policy. Exploitation requires a user to load attacker-controlled framing content; Thunderbird disables scripting in mail, limiting exposure to browser-like contexts.

CVSS severity6.5
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

CSP bypass in Firefox before 122, Firefox ESR before 115.7, and Thunderbird before 115.7 allows remote attackers to run inline script via an iframe. Document::Open incorrectly treats the implicit document.open() from document.write() as a fresh about:blank navigation, discarding the child's meta CSP and inheriting the parent's unsafe-inline policy. Exploitation requires a user to load attacker-controlled framing content; Thunderbird disables scripting in mail, limiting exposure to browser-like contexts.

The record

CVE
CVE-2024-0747
Published
Jan 23, 2024
Updated
May 22, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-693, T1189
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
Mozilla · Firefox ESRversion=unspecified <115.7

Published CVSS scores

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-693Protection Mechanism Failure
T1189Drive-by Compromise

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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