What is the CVSS score of EUVD-2026-21555?

EUVD-2026-21555 has a CVSS 3.1 base score of 7.1 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L. EPSS exploitation probability: 0.2%.

Which versions of PHP are affected by EUVD-2026-21555?

Chamilo LMS versions before 1.11.38 contain a remote code execution vulnerability that allows authenticated users, including students, to upload malicious PHP files and execute arbitrary code on the…. A patch is available.

PHP EUVD-2026-21555

| CVE-2026-33704 HIGH

Unrestricted Upload of File with Dangerous Type (CWE-434)

2026-04-10 security-advisories@github.com

PHP RCE Apache File Upload

7.1

CVSS 3.1

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

Low

Lifecycle Timeline

Re-analysis Queued

Apr 16, 2026 - 18:37 vuln.today

cvss_changed

Analysis Updated

Apr 16, 2026 - 05:58 EUVD-patch-fix

executive_summary

Re-analysis Queued

Apr 16, 2026 - 05:29 backfill_euvd_patch

patch_released

Patch available

Apr 16, 2026 - 05:29 EUVD

1.11.38

EUVD ID Assigned

Apr 10, 2026 - 19:22 euvd

EUVD-2026-21555

Analysis Generated

Apr 10, 2026 - 19:22 vuln.today

CVE Published

Apr 10, 2026 - 19:16 nvd

HIGH 7.1

DescriptionNVD

Chamilo LMS is a learning management system. Prior to 1.11.38, any authenticated user (including students) can write arbitrary content to files on the server via the BigUpload endpoint. The key parameter controls the filename and the raw POST body becomes the file content. While .php extensions are filtered to .phps, the .pht extension passes through unmodified. On Apache configurations where .pht is handled as PHP, this leads to Remote Code Execution. This vulnerability is fixed in 1.11.38.

AnalysisAI

Remote code execution in Chamilo LMS versions prior to 1.11.38 allows authenticated users (including low-privilege students) to upload and execute arbitrary PHP code through the BigUpload endpoint. Attackers exploit insufficient file extension filtering by uploading .pht files containing malicious code, which Apache servers with default .pht handlers execute as PHP. …

RemediationAI

Within 24 hours: Identify all Chamilo LMS instances and their current versions; disable the BigUpload endpoint if version is prior to 1.11.38 until patching is complete. Within 7 days: Apply vendor-released patch to Chamilo 1.11.38 or later on all affected instances; verify patch deployment. …

Analysis

Detailed AI-generated intelligence summary covering attack vector, impact assessment, affected versions, remediation steps, and indicators of compromise.

POChttps://••••••••••.com/exploit

PATCHhttps://••••••••••.com/patch

ADVISORYhttps://••••••••••.com/advisory

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EUVD-2026-21555 vulnerability details – vuln.today

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