CVE-2024-5691Network attack vector

Sandbox bypass via XFO error-page clickjacking

Published Jun 11, 2024 · Updated Mar 19, 2025

Clickjacking in Mozilla Firefox before 127, Firefox ESR before 115.12, and Thunderbird before 115.12 allows remote attackers to open a window. An X-Frame-Options-blocked document renders the browser's native error page inside a sandboxed iframe, where its Open Site in New Window button remains actionable. Exploitation requires a user to click the disguised button; Thunderbird normally disables scripting while reading email, limiting exposure to browser-like contexts.

CVSS severity4.7
Medium
EPSS probability0.65%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Clickjacking in Mozilla Firefox before 127, Firefox ESR before 115.12, and Thunderbird before 115.12 allows remote attackers to open a window. An X-Frame-Options-blocked document renders the browser's native error page inside a sandboxed iframe, where its Open Site in New Window button remains actionable. Exploitation requires a user to click the disguised button; Thunderbird normally disables scripting while reading email, limiting exposure to browser-like contexts.

The record

CVE
CVE-2024-5691
Published
Jun 11, 2024
Updated
Mar 19, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-693, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 11, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 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 <127

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <127
Mozilla · Thunderbirdversion=unspecified <115.12
Mozilla · Firefox ESRversion=unspecified <115.12

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
4.7CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-693Protection Mechanism Failure
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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