CVE-2025-8266Public exploitNetwork attack vector

Authenticated code execution via dynamic function construction

Published Jul 28, 2025 · Updated Jul 28, 2025

Code injection in ChanCMS 3.1.0 through 3.1.2 allows remote authenticated users to execute JavaScript via the getArticle endpoint. The getArticle handler in app/modules/cms/controller/collect.js passes the request-controlled parseData value directly to the Function constructor and runs the resulting function against collected article HTML. Access to the CMS gathering endpoint is required, after which injected JavaScript executes in the server process and can invoke operating-system commands.

CVSS severity6.3
Medium
EPSS probability0.98%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in ChanCMS 3.1.0 through 3.1.2 allows remote authenticated users to execute JavaScript via the getArticle endpoint. The getArticle handler in app/modules/cms/controller/collect.js passes the request-controlled parseData value directly to the Function constructor and runs the resulting function against collected article HTML. Access to the CMS gathering endpoint is required, after which injected JavaScript executes in the server process and can invoke operating-system commands.

The record

CVE
CVE-2025-8266
Published
Jul 28, 2025
Updated
Jul 28, 2025
Vendor
ChanCMS
Product
ChanCMS
Classifications
CWE-20, CWE-502, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 28, 2025CVE publishedPublication date reported by the CVE source.
  2. Jul 28, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.1.0
  2. Affected versionversion=3.1.1
  3. Affected versionversion=3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

ChanCMS · ChanCMSversion=3.1.0; version=3.1.1; version=3.1.2

Published CVSS scores

2.1VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
6.3VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
6.5VulDBAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-20Improper Input Validation
CWE-502Deserialization of Untrusted Data
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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