Vulnerability report

Trusted Third Party Report High Confidence Not in CISA KEV

CVE-2025-8266

yanyutao0402 ChanCMS collect.js getArticle deserialization

yanyutao0402 / ChanCMS · 3.1.0

Watch CVE-2025-8266 Browse KEV feed
Severity
CVSS 5.3 · Medium
Confidence
High
Exploit status
Trusted Third Party Report
EPSS
1.1%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2025-8266 is yanyutao0402 ChanCMS collect.js getArticle deserialization. A vulnerability has been found in yanyutao0402 ChanCMS up to 3.1.2 and classified as critical.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Also reported by third-party sources. Confidence is high.

Who is affected?

yanyutao0402 / ChanCMS, including 3.1.0, 3.1.1, and 3.1.2.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

A vulnerability has been found in yanyutao0402 ChanCMS up to 3.1.2 and classified as critical

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. In yanyutao0402 ChanCMS bis 3.1.2 wurde eine Schwachstelle gefunden.

Sie wurde als kritisch eingestuft. Betroffen ist die Funktion getArticle der Datei app/modules/cms/controller/collect.js. Dank Manipulation des Arguments targetUrl mit unbekannten Daten kann eine deserialization-Schwachstelle ausgenutzt werden. Der Angriff kann über das Netzwerk passieren. Der Exploit steht zur öffentlichen Verfügung. Ein Aktualisieren auf die Version 3.1.3 vermag dieses Problem zu lösen. Als bestmögliche Massnahme wird das Einspielen eines Upgrades empfohlen.

yanyutao0402 Affected
ChanCMS
3.1.0 3.1.1 3.1.2
yanyutao0402 Unaffected
ChanCMS
3.1.3
View vendor advisory (opens in new tab)
Published
28 Jul 2025
Exploitation Attempts Reported
18 Oct 2026
Attack vector
Remote
Complexity
Low
Privileges
Low
User interaction
None

Tags

nuclei_scanner

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

The Shadowserver

Recorded 18 Oct 2026

A trusted third party reported exploitation attempts.

Proof of concept available

Nuclei Templates

Recorded 12 Jun 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
The Shadowserver First 2026-10-18 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2025/CVE-2025-8266.yaml 01 Jun 2026

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

5.3 Medium

Potential damage if exploited. Separate from whether attackers are using it.

CVSS: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

EPSS

1.1%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Improper Input Validation CWE-20 Deserialization of Untrusted Data CWE-502

All CVSS Scores

CVSS v4.0 5.3 Medium

CVSS: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

CVSS v3.1 6.3 Medium

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

CVSS v3.0 6.3 Medium

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

CVSS v2.0 6.5 Medium

AV:N/AC:L/Au:S/C:P/I:P/A:P

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

ChanCMS <= 3.1. - Remote Code Execution

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation attempts

  1. 00:00 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party report of exploitation attempts

  2. 14:21 UTC

    Public PoC available

    Public proof-of-concept code published

  3. 15:34 UTC

    Nuclei template available

    Scanner coverage available

  4. 08:32 UTC

    CVE published

    Vulnerability disclosed publicly

  5. 09:45 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2025-8266

Sample API response 
{
  "cve_id": "CVE-2025-8266",
  "confidence": "High",
  "cvss_score": 5.3,
  "cvss_estimated": false,
  "epss_score": 0.01135,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}