8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2026-22256

CVE-2026-22256: Salvo is vulnerable to reflected XSS in the list_html function

Salvo is a Rust web backend framework. Prior to version 0.88.1, the function list_html generate an file view of a folder which include a render of the current path, in which its inserted in the HTML without proper sanitation, this leads to reflected XSS using the fact that request path is decoded and normalized in the matching stage but not is inserted raw in the html view (current.path), the only constraint here is for the root path (eg. /files in the PoC example) to have a sub directory (e.g common ones styles/scripts/etc…) so that the matching return the list HTML page instead of the Not Found page. This issue has been patched in version 0.88.1.

(GitHub Advisory)

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CVE-2026-22256

CVE-2026-22256:

8.8

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
salvo	rust	< 0.88.1	0.88.1

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability, a reflected XSS, is located in the list_html function of the salvo web framework, specifically within the salvo_serve_static crate. The vulnerability description explicitly points to this function and the unsanitized use of current.path. By analyzing the commits between the last vulnerable version (0.88.0) and the first patched version (0.88.1), I identified the fixing commit 6f1f42c447b0ee8efc752f763b8a46791b4b5113. The patch within this commit clearly shows the introduction of the encode_url_path function to sanitize the path before it's embedded in the HTML response inside the list_html function in crates/serve-static/src/dir.rs. The vulnerable code was directly using the request path in the HTML, which is a classic reflected XSS vulnerability. The fix involves escaping the user-provided path, which confirms the function's role in the vulnerability.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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