CVE-2026-22254Network attack vector

Stored XSS via unsanitized SVG asset upload

Published Feb 6, 2026 · Updated Feb 6, 2026

Stored XSS in Winter CMS before 1.2.10 allows remote authenticated users to run script through an uploaded SVG asset. AssetList.php's onUpload method stored SVG files without invoking SVG sanitization, leaving active content in theme assets. Exploitation requires Backend access with cms.manage_assets and user interaction, limiting execution to a viewer's browser.

CVSS severity3.5
Low
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Winter CMS before 1.2.10 allows remote authenticated users to run script through an uploaded SVG asset. AssetList.php's onUpload method stored SVG files without invoking SVG sanitization, leaving active content in theme assets. Exploitation requires Backend access with cms.manage_assets and user interaction, limiting execution to a viewer's browser.

The record

CVE
CVE-2026-22254
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
Winter CMS
Product
Winter CMS
Classifications
CWE-79, CWE-80, T1204
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2026Record 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=< 1.2.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Winter CMS · Winter CMSversion=< 1.2.10

Published CVSS scores

0.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:N/I:N/A:N
3.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1204User Execution

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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