GHSA-wjw2-4j7j-6gc3 · Severity: low · Ecosystem: composer — Winter CMS stored XSS through privileged upload of SVG file
Winter is a free, open-source content management system (CMS) based on the Laravel PHP framework. Users with the `backend.manage_branding` permission can upload SVGs as the application logo. Prior to version 1.2.3, SVG uploads were not sanitized, which could have allowed a stored cross-site scripting (XSS) attack. To exploit the vulnerability, an attacker would already need to have developer or super user level permissions in Winter CMS. This means they would already have extensive access and control within the system. Additionally, to execute the XSS, the attacker would need to convince the victim to directly visit the URL of the maliciously uploaded SVG, and the application would have to be using local storage where uploaded files are served under the same domain as the application itself instead of a CDN. This is because all SVGs in Winter CMS are rendered through an `img` tag, which prevents any payloads from being executed directly. These two factors significantly limit the potential harm of this vulnerability. This issue has been patched in v1.2.3 through the inclusion of full support for SVG uploads and automatic sanitization of uploaded SVG files. As a workaround, one may apply the patches manually.
Conclusion & alert: CVE-2023-37269 is rated Exploit Available (51.2/100): CVSS Low severity, with medium exploitation likelihood (EPSS 1.32%). Core evidence: 2 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| 51591 | exploit_db | edb | 2023-07-15 | Exploit-DB ↗ |
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-01 | 1.06% | 1.32% | +0.26% |
| 2 | 2026-02-15 | 1.28% | 1.06% | -0.23% |
| 3 | 2026-01-28 | — | 1.28% | — |
Full EPSS history (15 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 2.0 | 3.1 | LOW |
|
0.5 | 1.4 | [email protected] |
| 4.8 | 3.1 | MEDIUM |
|
1.7 | 2.7 | [email protected] |
GHSA-wjw2-4j7j-6gc3 · Severity: low · Ecosystem: composer — Winter CMS stored XSS through privileged upload of SVG file
| URL | Tags |
|---|---|
| http://packetstormsecurity.com/files/173520/WinterCMS-1.2.2-Cross-Site-Scripting.html | Exploit Third Party Advisory VDB Entry |
| https://github.com/wintercms/storm/commit/186d85d8fea2cae43afc807d39f68553c24e56be | Patch |
| https://github.com/wintercms/winter/commit/fa50b4c7489b67ea80072f8ac9fe5294fce1df1c | Patch |
| https://github.com/wintercms/winter/releases/tag/v1.2.3 | Release Notes |
| https://github.com/wintercms/winter/security/advisories/GHSA-wjw2-4j7j-6gc3 | Patch Vendor Advisory |