CVE-2025-66447Network attack vector

Phishing redirects via unsanitized login destination

Published Apr 10, 2026 · Updated Apr 10, 2026

Open redirect in Chamilo LMS 1.11.0 through 2.0.0-RC.2 allows remote attackers to send users to an external site through /login. The login flow copies the redirect query parameter into returnUrl and later assigns server-supplied redirect values to window.location.href without consistently enforcing same-origin destinations. A victim must follow a crafted login link and complete the affected flow, after which the browser is sent to an attacker-controlled site for phishing.

CVSS severity0.0
None
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Chamilo LMS 1.11.0 through 2.0.0-RC.2 allows remote attackers to send users to an external site through /login. The login flow copies the redirect query parameter into returnUrl and later assigns server-supplied redirect values to window.location.href without consistently enforcing same-origin destinations. A victim must follow a crafted login link and complete the affected flow, after which the browser is sent to an attacker-controlled site for phishing.

The record

CVE
CVE-2025-66447
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
Chamilo
Product
Chamilo LMS
Classifications
CWE-601, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=>= 1.11.0, < 2.0.0-RC.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chamilo · Chamilo LMSversion=>= 1.11.0, < 2.0.0-RC.3

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
0.0GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-601URL Redirection to Untrusted Site ('Open Redirect')
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

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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