CVE-2022-22755Public exploitNetwork attack vector

Persistent JavaScript execution via uncanceled XSL loads

Published Dec 22, 2022 · Updated Apr 16, 2025

Improper resource handling in Mozilla Firefox before 97 allows remote attackers to keep same-origin JavaScript running after tab closure. The XSLT processor allowed a transform to start new network loads after its load group was canceled, leaving recursive script execution alive. A user must open attacker-served XSL content; the code remains confined to the document's origin but can track activity, consume computing resources, or generate traffic.

CVSS severity8.8
High
EPSS probability0.59%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper resource handling in Mozilla Firefox before 97 allows remote attackers to keep same-origin JavaScript running after tab closure. The XSLT processor allowed a transform to start new network loads after its load group was canceled, leaving recursive script execution alive. A user must open attacker-served XSL content; the code remains confined to the document's origin but can track activity, consume computing resources, or generate traffic.

The record

CVE
CVE-2022-22755
Published
Dec 22, 2022
Updated
Apr 16, 2025
Vendor
Mozilla
Product
Firefox
Classifications
CWE-672, 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 <97

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefoxversion=unspecified <97

Published CVSS scores

8.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
8.8NIST NVDCVSS: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-672Operation on a Resource after Expiration or Release
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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