PT-2026-6478 · Crates.Io · Salvo

Published

2026-01-08

·

Updated

2026-01-08

CVSS v3.1

8.8

High

VectorAV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:L

Summary

The function list html generates an file view of a folder which includes a render of the current path, in which its inserted in the HTML without proper sanitation, leading to reflected XSS. The request path is decoded and normalized in the matching stage but is not inserted raw in the HTML view (current.path). The only constraint here is for the root path (e.g., /files in the PoC example) to have a subdirectory (e. g., common ones like styles/scripts/etc.) so that the matching returns the list HTML page instead of the Not Found page.

Details

The vulnerable snippet of code is the following: dir.rs
rust
// ... fn list html(...
  let mut ftxt = format!(
    r#"<!DOCTYPE html><html><head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>{}</title>
    <style>{}</style></head><body><header><h3>Index of: {}</h3></header><hr/>"#,
    current.path,
    HTML STYLE,
    header links(&current.path)
  );
// ...
As seen here <title>{}</title> it is inserted unsafely.

PoC

https://github.com/user-attachments/assets/92a29a67-547b-40a5-af26-f1b0dd332702
Here is the example app, note this doesn’t need an upload feature (e.g to the other reported vulnerability), only the sub-folder is required.
main.rs
rust
use salvo::prelude::*;
use salvo::serve static::StaticDir;
use tokio::fs;

#[tokio::main]
async fn main() {
  tracing subscriber::fmt().init();
  fs::create dir all("uploads").await.expect("create uploads dir");

  let router = Router::new()
    .push(
      Router::with path("files/{**rest path}")
        .get(StaticDir::new("uploads").auto list(true)),
    );

  let acceptor = TcpListener::new("127.0.0.1:5800").bind().await;
  Server::new(acceptor).serve(router).await;
}
Cargo.toml
rust
[package]
name = "salvo-staticdir-xss-poc"
version = "0.1.0"
edition = "2024"

[dependencies]
salvo = { version = "0.85.0", features = ["serve-static"] }
tokio = { version = "1", features = ["macros", "rt-multi-thread", "fs"] }
tracing-subscriber = "0.3"
Setup commands:
bash
mkdir uploads
mkdir uploads/bla

Impact

JavaScript execution, most likely leading to an account takeover, depending on the site's constraint (CSP, etc…).

Fix

XSS

Found an issue in the description? Have something to add? Feel free to write us 👾
dbugs@ptsecurity.com

Weakness Enumeration

CWE-79

Related Identifiers

GHSA-RJF8-2WCW-F6MP

Affected Products

Salvo