CVE-2026-81267Network attack vector

Origin spoofing via stalled cross-origin popup navigation

Published Aug 31, 2026 · Updated Aug 31, 2026

Origin spoofing in Mozilla Firefox for iOS before 155.0 allows remote attackers to display attacker-controlled content under a trusted origin. After a popup commits a cross-origin navigation, a malicious page can stall the transition so the address bar adopts the destination origin while the popup keeps rendering the attacker's document. Exploitation requires a user to open the malicious page and popup; the demonstrated consequence is UI deception that can support phishing, not reported code execution or direct data access.

CVSS severity5.4
Medium
EPSS probability0.20%
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 for iOS before 155.0 allows remote attackers to display attacker-controlled content under a trusted origin. After a popup commits a cross-origin navigation, a malicious page can stall the transition so the address bar adopts the destination origin while the popup keeps rendering the attacker's document. Exploitation requires a user to open the malicious page and popup; the demonstrated consequence is UI deception that can support phishing, not reported code execution or direct data access.

The record

CVE
CVE-2026-81267
Published
Aug 31, 2026
Updated
Aug 31, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-451, CAPEC-98, CAPEC-154, CAPEC-163, CAPEC-164, CAPEC-173, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 31, 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

5.4GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-451User Interface (UI) Misrepresentation of Critical Information
CAPEC-98Phishing
CAPEC-154Resource Location Spoofing
CAPEC-163Spear Phishing
CAPEC-164Mobile Phishing
CAPEC-173Action Spoofing
T1036Masquerading

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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