TI-2026-56892 Aliases CVE-2026-82535 GHSA-xf2f-2vj2-6hfr

Chamilo LMS Stored XSS via Survey Answer Submission in reporting.php

LOW 25CWE-79Published 2026-09-11 · Updated 2026-10-01

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: Low
Attack requirements: None
Impact type: Cross-site scripting
Confidentiality · integrity · availability: None · None · None
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

Chamilo LMS before 1.11.42 and 3.0.0 contains a stored cross-site scripting vulnerability that allows unauthenticated attackers to inject malicious script payloads into survey answers by computing deterministic invitation codes and bypassing authorization checks in the survey submission endpoint. Attackers can submit crafted answers containing unescaped HTML rendered in reporting views to execute arbitrary scripts in the browser sessions of teachers or administrators, enabling persistent backdoor account creation by exploiting the victim's authenticated session.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00474 41st percentileScored 2026-11-07

Fix Fixed chamilo-lms (chamilo): 1.11.42, 3.0.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
chamilo	chamilo-lms	1.11.0 – 1.11.40; 2.0.0 – 2.0.3	1.11.42, 3.0.0	Patch available	CNA

chamilo-lms Vendorchamilo Affected 1.11.0 – 1.11.40; 2.0.0 – 2.0.3 Fixed in 1.11.42, 3.0.0 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:chamilo:chamilo_lms::::::::	—	—	chamilo

cpe:2.3:a:chamilo:chamilo_lms:*:*:*:*:*:*:*:* Versions — — ·chamilo

Remediation

Fix · CNA chamilo-lms (chamilo) Fixed in 1.11.42, 3.0.0

Timeline

2026-10-02 Threatist record created from CVE-2026-82535
2026-10-03 Alias added: GHSA-xf2f-2vj2-6hfr

References

Patch 3

Advisory 1

GitHub Security Advisory (GHSA-m3wr-p8wj-jmf6)

Other 1

Chamilo LMS v3.0.0 Release Notes

TI-2023-17452 A command injection vulnerability in the wsConvertPpt component of Chamilo v1.11.* up to… CVSS 3.1CRITICAL 9.8
TI-2023-03150 Chamilo LMS Unauthenticated Command Injection CVSS 3.1CRITICAL 9.8
TI-2025-32070 Chamilo: Evaluation of untrusted user input leads to Remote Code Execution CVSS 3.1CRITICAL 9.8
TI-2025-32081 Deserialization of untrusted data in chamilo-lms CVSS 4.0HIGH 8.8
TI-2024-32140 Chamilo: Post-Auth Remote Code Execution CVSS 4.0HIGH 8.7
TI-2023-03907 Chamilo LMS Unauthenticated Big Upload File Remote Code Execution CVSS 3.1HIGH 8.1

See all 162 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences