CVE-2023-37269Public exploitNetwork attack vector

Stored XSS via unsanitized branding SVG upload

Published Jul 7, 2023 · Updated Feb 13, 2025

Stored XSS in Winter CMS before 1.2.3 allows remote authenticated users to run script in a victim's browser through a branding SVG. The branding-logo upload path saved SVG content without first passing it through Winter\Storm\Support\Svg::extract for sanitization. Execution requires developer or super user permissions, local same-origin file storage, and a victim who directly visits the uploaded SVG URL.

CVSS severity2.0
Low
EPSS probability2.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Winter CMS before 1.2.3 allows remote authenticated users to run script in a victim's browser through a branding SVG. The branding-logo upload path saved SVG content without first passing it through Winter\Storm\Support\Svg::extract for sanitization. Execution requires developer or super user permissions, local same-origin file storage, and a victim who directly visits the uploaded SVG URL.

The record

CVE
CVE-2023-37269
Published
Jul 7, 2023
Updated
Feb 13, 2025
Vendor
Winter CMS
Product
Winter CMS
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 7, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=< 1.2.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Winter CMS · Winter CMSversion=< 1.2.3

Published CVSS scores

2.0GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001Malicious Link

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo