CVE-2024-26281Public exploitNetwork attack vector

Cross-origin script execution via unsanitized QR URLs

Published Feb 22, 2024 · Updated Nov 20, 2024

Cross-site scripting in Mozilla Firefox for iOS before 123 allows remote attackers to execute scripts in the current top origin via a QR code. The QR reader's delegate navigation path omits URL sanitization and accepts a crafted JavaScript URI instead of restricting direct navigation to HTTP or HTTPS. Exploitation requires a user to scan the attacker's QR code, after which the script can modify content in the origin shown in the URL bar.

CVSS severity4.7
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Mozilla Firefox for iOS before 123 allows remote attackers to execute scripts in the current top origin via a QR code. The QR reader's delegate navigation path omits URL sanitization and accepts a crafted JavaScript URI instead of restricting direct navigation to HTTP or HTTPS. Exploitation requires a user to scan the attacker's QR code, after which the script can modify content in the origin shown in the URL bar.

The record

CVE
CVE-2024-26281
Published
Feb 22, 2024
Updated
Nov 20, 2024
Vendor
Mozilla
Product
Firefox for iOS
Classifications
CWE-79, T1204
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 22, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 20, 2024Record 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

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 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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204User 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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