CVE-2026-31941 [High] | Security Vulnerability in Chamilo Lms

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-11	—	0.03%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-11

—

0.03%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.7	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	3.1	4.0	[email protected]
6.5	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:N) Service keeps running; no real outage angle.	2.8	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.7

3.1

HIGH

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

3.1

4.0

[email protected]

6.5

3.1

MEDIUM

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

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:N): Service keeps running; no real outage angle.

2.8

3.6

[email protected]

Affected software / configurations for CVE-2026-31941

Vendor	Product	Version	Raw CPE
chamilo	chamilo_lms	< 1.11.38	cpe:2.3:a:chamilo:chamilo_lms::::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha1::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha2::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha3::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha4::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:alpha5::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:beta1::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:beta2::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:beta3::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:rc1::::::
chamilo	chamilo_lms	2.0.0	cpe:2.3:a:chamilo:chamilo_lms:2.0.0:rc2::::::

References for CVE-2026-31941

URL	Tags
https://github.com/chamilo/chamilo-lms/commit/e3790c5f0ff3b4dc547c2099fadf5c438c1bb265	Patch
https://github.com/chamilo/chamilo-lms/commit/ea6b7b7e90580c9b01dc4bcafe4ad737061e0ead	Patch
https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-q74c-mx8x-489h	Vendor Advisory

URL

CVE-2026-31941 | Server-Side Request Forgery (SSRF) in Chamilo LMS

Exploit prediction scoring system (EPSS) score for CVE-2026-31941

Common vulnerability scoring system (CVSS) metrics for CVE-2026-31941

Weakness enumeration for CVE-2026-31941

Affected software / configurations for CVE-2026-31941

References for CVE-2026-31941