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EUVD-2026-218617

2026-10-03T11:38:39.421521+00:00

EUVD-2026-218617

fkie_cve-2025-27088

2026-10-03T11:38:39.421559+00:00

oxyno-zeta/s3-proxy is an aws s3 proxy written in go. In affected versions a Reflected Cross-site Scripting (XSS) vulnerability enables attackers to create malicious URLs that, when visited, inject scripts into the web application. This can lead to session hijacking or phishing attacks on a trusted domain, posing a moderate risk to all users. It's possible to inject html elements, including scripts through the folder-list template. The affected template allows users to interact with the URL path provided by the `Request.URL.Path` variable, which is then rendered directly into the HTML without proper sanitization or escaping. This can be abused by attackers who craft a malicious URL containing injected HTML or JavaScript. When users visit such a URL, the malicious script will be executed in the user's context. This issue has been addressed in version 4.18.1 and all users are advised to upgrade. There are no known workarounds for this vulnerability.

GHSA-pp9m-qf39-hxjc — S3-Proxy allows Reflected Cross-site Scripting (XSS) in template implementation

2026-10-03T11:38:39.421598+00:00

Affected: Go: github.com/oxyno-zeta/s3-proxy/cmd/s3-proxy

### Summary A Reflected Cross-site Scripting (XSS) vulnerability enables attackers to create malicious URLs that, when visited, inject scripts into the web application. This can lead to session hijacking or phishing attacks on a trusted domain, posing a high risk to all users.

### Details _Give all details on the vulnerability. Pointing to the incriminated source code is very helpful for the maintainer._ It's possible to inject html elements, including scripts through the [folder-list template](https://github.com/oxyno-zeta/s3-proxy/blob/master/templates/folder-list.tpl#L19C21-L19C38). It seems like the `.Request.URL.Path` variable is not escaped.

I did some research and found it might be due to the `text/template` import being used in [the template implementation](https://github.com/oxyno-zeta/s3-proxy/blob/master/pkg/s3-proxy/utils/templateutils/template.go#L8), instead of the [safer](https://pkg.go.dev/html/template) `html/template`.

### PoC _Complete instructions, including specific configuration details, to reproduce the vulnerability._ Using the [default template configuration](https://oxyno-zeta.github.io/s3-proxy/configuration/structure/#targettemplateconfig), the vulnerability can be reproduced with the following steps.

1. Navigate to `https://your-s3-proxy.com/path-not-found` and confirm the page looks as follows: ![image](https://github.com/user-attachments/assets/1c87e274-18ec-4eb3-94fe-25bb1c0abf37)

2. Try inserting an HTML element by changing `/path-not-fo…

openSUSE-SU-2025:14889-1 — govulncheck-vulndb-0.0.20250312T181707-1.1 on GA media

2026-10-03T11:38:39.421646+00:00

govulncheck-vulndb-0.0.20250312T181707-1.1 on GA media