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GHSA-4wvw-75qh-fqjp
No affected components available
Impact
Users with the media.manage_media permission can upload files to the Media Manager and rename them after uploading. Previously, media manager files were only sanitized on upload, not on renaming, which could have allowed a stored XSS attack.
Although this was a security issue, it's important to note that its severity is low. To exploit the vulnerability, an attacker would already need to have trusted permissions in the Winter CMS backend. 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. That being said, all users are advised to update to the latest version (1.2.4) to ensure their systems remain secure.
Patches
This issue has been patched in v1.2.4.
Workarounds
Apply https://github.com/wintercms/winter/commit/2969daeea8dee64d292dbaa3778ea251e2a7e491 and https://github.com/wintercms/winter/commit/2969daeea8dee64d292dbaa3778ea251e2a7e491 manually if unable to upgrade to v1.2.4.
References
Related: https://github.com/wintercms/winter/security/advisories/GHSA-wjw2-4j7j-6gc3
The vulnerability can be exploited over the network without needing physical access. It is difficult for an attacker to exploit this vulnerability and may require special conditions. An attacker needs high-level or administrative privileges. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a low impact on the integrity of the data.
Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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