CVE-2024-11695Public exploitNetwork attack vector

Origin spoofing via unencoded Unicode whitespace

Published Nov 26, 2024 · Updated Nov 3, 2025

URL bar spoofing in Mozilla Firefox before 133, Firefox ESR before 128.5, and Thunderbird before 133 allows remote attackers to hide a page's origin. The address-bar formatter fails to percent-encode whitespace followed by Unicode separator or control characters, allowing Arabic Punycode and blank-rendering code points to push the real origin out of view. Exploitation requires a user to open a crafted URL and trust the misleading address bar; the demonstrated consequence is origin spoofing rather than direct data access or code execution.

CVSS severity5.4
Medium
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

URL bar spoofing in Mozilla Firefox before 133, Firefox ESR before 128.5, and Thunderbird before 133 allows remote attackers to hide a page's origin. The address-bar formatter fails to percent-encode whitespace followed by Unicode separator or control characters, allowing Arabic Punycode and blank-rendering code points to push the real origin out of view. Exploitation requires a user to open a crafted URL and trust the misleading address bar; the demonstrated consequence is origin spoofing rather than direct data access or code execution.

The record

CVE
CVE-2024-11695
Published
Nov 26, 2024
Updated
Nov 3, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-1021
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 26, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 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 <133

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <133
Mozilla · Thunderbirdversion=unspecified <128.5; version=unspecified <133
Mozilla · Firefox ESRversion=unspecified <128.5

Published CVSS scores

5.4CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 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

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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