CVE-2026-33707Network attack vector

Unauthenticated account takeover via deterministic reset tokens

Published Apr 10, 2026 · Updated Apr 10, 2026

Weak password recovery in Chamilo LMS before 1.11.38 and 2.0.0-alpha.1 through 2.0.0-RC.2 allows remote attackers to take over accounts. In main/inc/lib/login.lib.php, get_secret_word hashes only the user's email with SHA-1, and reset_password accepts that deterministic value without requiring a reset request or checking expiration. Knowing a user's email and sequential ID is sufficient to forge the reset URL, replace the password without authentication, and assume the victim's account privileges.

CVSS severity9.4
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Weak password recovery in Chamilo LMS before 1.11.38 and 2.0.0-alpha.1 through 2.0.0-RC.2 allows remote attackers to take over accounts. In main/inc/lib/login.lib.php, get_secret_word hashes only the user's email with SHA-1, and reset_password accepts that deterministic value without requiring a reset request or checking expiration. Knowing a user's email and sequential ID is sufficient to forge the reset URL, replace the password without authentication, and assume the victim's account privileges.

The record

CVE
CVE-2026-33707
Published
Apr 10, 2026
Updated
Apr 10, 2026
Vendor
Chamilo
Product
Chamilo LMS
Classifications
CWE-640, T1098
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=< 1.11.38
  2. Affected versionversion=>= 2.0.0-alpha.1, < 2.0.0-RC.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Chamilo · Chamilo LMSversion=< 1.11.38; version=>= 2.0.0-alpha.1, < 2.0.0-RC.3

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

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.

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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-640Weak Password Recovery Mechanism for Forgotten Password
T1098Account Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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