CVE-2023-52083Network attack vector

Stored XSS via case-sensitive SVG rename check

Published Dec 28, 2023 · Updated Aug 2, 2024

Stored XSS in Winter CMS before 1.2.4 allows remote authenticated users to execute script through a renamed Media Manager SVG. MediaLibrary::moveFile checks the new extension against lowercase svg without normalizing case, so an uppercase or mixed-case SVG suffix bypasses sanitization. Exploitation requires media.manage_media permission, local media storage on the application domain, and a victim who directly visits the malicious SVG URL.

CVSS severity2.0
Low
EPSS probability0.31%
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 1.2.4 allows remote authenticated users to execute script through a renamed Media Manager SVG. MediaLibrary::moveFile checks the new extension against lowercase svg without normalizing case, so an uppercase or mixed-case SVG suffix bypasses sanitization. Exploitation requires media.manage_media permission, local media storage on the application domain, and a victim who directly visits the malicious SVG URL.

The record

CVE
CVE-2023-52083
Published
Dec 28, 2023
Updated
Aug 2, 2024
Vendor
Winter CMS
Product
Winter CMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Dec 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 2024Record 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=< 1.2.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Winter CMS · Winter CMSversion=< 1.2.4

Published CVSS scores

2.0GitHubCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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