CVE-2025-27426Public exploitNetwork attack vector

Address-bar spoofing via internal error-page redirect

Published Mar 4, 2025 · Updated Jun 4, 2026

URL spoofing in Mozilla Firefox for iOS before 136 allows remote attackers to display a false website address after an internal-page redirect. A server redirect to internal://local/errorpage sets the address bar from an attacker-controlled url parameter while the tab retains the attacker's origin, enabling cross-window content replacement. A victim must open the malicious page and tap its link; Mozilla reproduced the spoof with legacy error pages but not with the native error-page experiment.

CVSS severity5.4
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

URL spoofing in Mozilla Firefox for iOS before 136 allows remote attackers to display a false website address after an internal-page redirect. A server redirect to internal://local/errorpage sets the address bar from an attacker-controlled url parameter while the tab retains the attacker's origin, enabling cross-window content replacement. A victim must open the malicious page and tap its link; Mozilla reproduced the spoof with legacy error pages but not with the native error-page experiment.

The record

CVE
CVE-2025-27426
Published
Mar 4, 2025
Updated
Jun 4, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-601, CAPEC-178, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 4, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

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-601URL Redirection to Untrusted Site ('Open Redirect')
CAPEC-178Cross-Site Flashing
T1204.001Malicious Link

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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