CVE-2022-22749Network attack vector

Privileged navigation via unrestricted QR URLs

Published Dec 22, 2022 · Updated Apr 16, 2025

Improper input validation in Mozilla Firefox before 96 allows remote attackers to navigate Firefox for Android to non-web URLs via QR codes. The QR scanner accepts scanned URL schemes without restricting them to HTTP or HTTPS and can open privileged about: pages that websites normally cannot reach. Exploitation requires a user to scan an attacker-controlled QR code, after which navigation to internal or other non-web content can expose privileged browser functionality; other operating systems are unaffected.

CVSS severity4.3
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper input validation in Mozilla Firefox before 96 allows remote attackers to navigate Firefox for Android to non-web URLs via QR codes. The QR scanner accepts scanned URL schemes without restricting them to HTTP or HTTPS and can open privileged about: pages that websites normally cannot reach. Exploitation requires a user to scan an attacker-controlled QR code, after which navigation to internal or other non-web content can expose privileged browser functionality; other operating systems are unaffected.

The record

CVE
CVE-2022-22749
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-20, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 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 <96

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <96

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
4.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
T1204.001User Execution: Malicious Link

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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