CVE-2024-26282Public exploitNetwork attack vector

Cross-origin script execution via unvalidated canonical URLs

Published Feb 22, 2024 · Updated Mar 13, 2025

Universal cross-site scripting in Mozilla Firefox for iOS before 123 allows remote attackers to execute JavaScript via a crafted AMP page. The MetadataHelper script treats an AMP page's unvalidated canonical href as the page URL, allowing a javascript: URL to be stored as a bookmark. Exploitation requires a user to visit the page, create the bookmark, and later open it while another top-origin site is active, enabling script execution in that site's context.

CVSS severity7.1
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Universal cross-site scripting in Mozilla Firefox for iOS before 123 allows remote attackers to execute JavaScript via a crafted AMP page. The MetadataHelper script treats an AMP page's unvalidated canonical href as the page URL, allowing a javascript: URL to be stored as a bookmark. Exploitation requires a user to visit the page, create the bookmark, and later open it while another top-origin site is active, enabling script execution in that site's context.

The record

CVE
CVE-2024-26282
Published
Feb 22, 2024
Updated
Mar 13, 2025
Vendor
Mozilla
Product
Firefox for iOS
Classifications
CWE-80, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 13, 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 <123

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefox for iOSversion=unspecified <123

Published CVSS scores

7.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/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.

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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-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1203Exploitation for Client Execution

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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