CVE-2022-28284Public exploitNetwork attack vector

Cross-site scripting via cross-document SVG use

Published Dec 22, 2022 · Updated Apr 16, 2025

Cross-site scripting in Mozilla Firefox before 99 allows remote attackers to execute script through a crafted web page. SVGUseElement permitted a same-origin external SVG referenced by use to clone a foreignObject containing an iframe whose srcdoc executed script. Exploitation requires a user to load attacker-controlled content in a site that trusts Firefox to block executable descendants, granting the script access to the embedding page DOM and cookies.

CVSS severity8.8
High
EPSS probability0.55%
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 before 99 allows remote attackers to execute script through a crafted web page. SVGUseElement permitted a same-origin external SVG referenced by use to clone a foreignObject containing an iframe whose srcdoc executed script. Exploitation requires a user to load attacker-controlled content in a site that trusts Firefox to block executable descendants, granting the script access to the embedding page DOM and cookies.

The record

CVE
CVE-2022-28284
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-116, T1203, T1189
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <99

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <99

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
T1203Exploitation for Client Execution
T1189Drive-by Compromise

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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