CVE-2022-22748Public exploitNetwork attack vector

Origin spoofing via external-protocol redirects

Published Dec 22, 2022 · Updated Apr 16, 2025

Origin spoofing in Firefox before 96, Firefox ESR before 91.5, and Thunderbird before 91.5 allows remote attackers to mislabel launch prompts. A server-side redirect from an HTTP(S) URL to an external scheme makes the dialog use the initiating page's origin instead of the redirecting origin. A link click normally triggers the prompt; prior handler approval or enterprise policy removes that interaction, enabling a malicious site to borrow a trusted origin and induce an external application launch.

CVSS severity6.5
Medium
EPSS probability0.74%
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 Firefox before 96, Firefox ESR before 91.5, and Thunderbird before 91.5 allows remote attackers to mislabel launch prompts. A server-side redirect from an HTTP(S) URL to an external scheme makes the dialog use the initiating page's origin instead of the redirecting origin. A link click normally triggers the prompt; prior handler approval or enterprise policy removes that interaction, enabling a malicious site to borrow a trusted origin and induce an external application launch.

The record

CVE
CVE-2022-22748
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-79, T1036
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
Mozilla · Thunderbirdversion=unspecified <91.5
Mozilla · Firefox ESRversion=unspecified <91.5

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
6.5NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/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.

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')
T1036Masquerading

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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