What is the CVSS score of EUVD-2026-21523?

EUVD-2026-21523 has a CVSS 3.1 base score of 7.7 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N. EPSS exploitation probability: 0.0%.

Which versions of Chamilo Lms are affected by EUVD-2026-21523?

Chamilo LMS versions prior to 1.11.38 and 2.0.0-RC.3 contain a Server-Side Request Forgery vulnerability in the Social Wall feature that allows authenticated users to force the server to access…. A patch is available.

How to fix or mitigate EUVD-2026-21523?

Within 24 hours: Identify all Chamilo LMS deployments and document current versions. Within 7 days: Apply vendor patch to upgrade Chamilo LMS to version 1.11.38 or later for 1.x deployments, or 2.0.0-RC.3 or later for 2.x deployments. Within 30 days: Audit access logs for the read_url_with_open_graph endpoint (social_wall_new_msg_main parameter) to identify potential exploitation attempts; review user account access levels and remove unnecessary authenticated privileges.

Chamilo Lms EUVD-2026-21523

| CVE-2026-31941 HIGH

Server-Side Request Forgery (SSRF) (CWE-918)

2026-04-10 GitHub_M

SSRF Chamilo Lms

7.7

CVSS 3.1 · GitHub Advisory

Severity by source

GitHub Advisory PRIMARY

7.7 HIGH

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

Primary rating from GitHub Advisory · only source for this CVE.

CVSS VectorGitHub Advisory

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Lifecycle Timeline

Re-analysis Queued

Apr 17, 2026 - 21:37 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

1.11.38,2.0.0-RC.3

EUVD ID Assigned

Apr 10, 2026 - 18:00 euvd

EUVD-2026-21523

Analysis Generated

Apr 10, 2026 - 18:00 vuln.today

CVE Published

Apr 10, 2026 - 17:37 nvd

HIGH 7.7

DescriptionGitHub Advisory

Chamilo LMS is a learning management system. Prior to 1.11.38 and 2.0.0-RC.3, Chamilo LMS contains a Server-Side Request Forgery (SSRF) vulnerability in the Social Wall feature. The endpoint read_url_with_open_graph accepts a URL from the user via the social_wall_new_msg_main POST parameter and performs two server-side HTTP requests to that URL without validating whether the target is an internal or external resource. This allows an authenticated attacker to force the server to make arbitrary HTTP requests to internal services, scan internal ports, and access cloud instance metadata. This vulnerability is fixed in 1.11.38 and 2.0.0-RC.3.

AnalysisAI

Server-Side Request Forgery in Chamilo LMS Social Wall feature enables authenticated attackers to force the server to make arbitrary HTTP requests to internal resources. The read_url_with_open_graph endpoint accepts user-controlled URLs via social_wall_new_msg_main POST parameter without validating internal versus external targets, allowing internal port scanning, access to cloud instance metadata (AWS/GCP/Azure), and reconnaissance of private network services. Affects Chamilo LMS versions before 1.11.38 and 2.0.0-RC.3. Attack requires low-privilege authenticated access; no public exploit identified at time of analysis.

Technical ContextAI

CWE-918 SSRF vulnerability stems from missing input validation on user-supplied URLs before server-side HTTP request execution. The Social Wall feature's read_url_with_open_graph endpoint performs dual HTTP requests without allowlist/blocklist filtering, enabling SSRF to RFC1918 private networks, localhost services, and cloud metadata endpoints (169.254.169.254). CVSS vector PR:L indicates authenticated exploitation; scope change (S:C) reflects cross-boundary impact to internal systems.

RemediationAI

Vendor-released patches: upgrade to Chamilo LMS version 1.11.38 (stable branch) or 2.0.0-RC.3 (development branch). Upstream fixes implement URL validation to prevent requests to internal network ranges and cloud metadata endpoints (commits e3790c5f0ff3b4dc547c2099fadf5c438c1bb265 and ea6b7b7e90580c9b01dc4bcafe4ad737061e0ead). Workarounds for environments unable to upgrade immediately: disable Social Wall functionality via administrator panel, implement network-level egress filtering to block server-initiated requests to RFC1918 ranges and 169.254.0.0/16, or restrict Social Wall feature access to highly trusted users only. Full security advisory with technical details: https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-q74c-mx8x-489h