# CVE-2025-8266: ChanCMS - RCE

> Live exploitation tracking for CVE-2025-8266 by the CrowdSec Live Exploit Tracker, built from real-world attack data crowdsourced from CrowdSec's global network.

Page: https://tracker.crowdsec.net/cves/CVE-2025-8266

## Key facts

- **Exploitation phase:** Limited Exploitation. The vulnerability is known but shows very limited attacker interest or exploitation activity.
- **CVSS score:** 5.3
- **Public exploit available:** Yes
- **Affected products:** yanyutao0402 ChanCMS
- **Weaknesses:** CWE-502 (Deserialization of Untrusted Data); CWE-20 (Improper Input Validation)
- **Tags:** cms, web_application

## Description

A vulnerability has been found in yanyutao0402 ChanCMS up to 3.1.2 and classified as critical. Affected by this vulnerability is the function getArticle of the file app/modules/cms/controller/collect.js. The manipulation of the argument targetUrl leads to deserialization. The attack can be launched remotely. The exploit has been disclosed to the public and may be used. Upgrading to version 3.1.3 is able to address this issue. It is recommended to upgrade the affected component.

## CrowdSec analysis

[CVE-2025-8266](https://euvd.enisa.europa.eu/vulnerability/CVE-2025-8266) is a critical vulnerability in yanyutao0402 ChanCMS versions up to 3.1.2, specifically affecting the getArticle function in collect.js. This flaw allows remote attackers to exploit unsafe deserialization via the targetUrl parameter, potentially leading to remote code execution. With public exploit details available, attackers could leverage this vulnerability to compromise affected systems. Upgrading to version 3.1.3 is strongly recommended to mitigate the risk.

CrowdSec has been tracking this vulnerability and its exploits since 30th of March 2026.

CrowdSec network observations suggest that most exploitation of CVE-2025-8266 involves focused reconnaissance to identify viable targets. Attackers typically tailor their campaigns based on system exposure and configuration. It is unlikely that a given attack is accidental.
CrowdSec network telemetry also shows that exploitation of CVE-2025-8266 has significantly declined over the past week. Attack volumes are well below the long-term average, suggesting attackers are rapidly losing interest. The vulnerability appears to be falling out of active use across most threat landscapes.

Attackers exploit the `/cms/gather/getArticle` endpoint by manipulating the `targetUrl` and `parseData` parameters to trigger insecure deserialization, enabling remote code execution on vulnerable ChanCMS instances.

## Timeline

- 2025-07-28: CVE Published. CVE-2025-8266 is published to NVD.
- 2026-03-30: Rule Released. CrowdSec releases a rule to detect CVE-2025-8266 exploitation attempts against the CrowdSec Network.
- 2026-03-31: CrowdSec First Seen. CrowdSec observes in-the-wild exploitation of CVE-2025-8266 for the first time.

## References

- https://gitee.com/yanyutao0402/ChanCMS/issues/ICLP61
- https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-8266.yaml

## Live exploitation data

The [Live Exploit Tracker page](https://tracker.crowdsec.net/cves/CVE-2025-8266) follows observed exploitation activity for CVE-2025-8266. [Request an API key](https://tracker.crowdsec.net/request-api-key) for full access to its exploitation timeline, attacking IP addresses and blocklists.