CVE-2026-82535PoC

LOWCVSS 5.3 · MEDIUM

Exploit discussion active in current signal (1 latest mentions)

Immediate actions

Hunt for exploitation attempts and persistence artifacts
Increase monitoring for publicly documented tradecraft
Track advisory updates for patch or workaround availability

Recommended action window: High priority (within 72h)

NVD description

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.

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1.5/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-79

Priority

LOW

Exploitation

NONE

PoC

YES

Patch

NONE

Momentum

NONE

Threat summary

Public PoC is present in monitored signal
1 mentions across 1 observed day

What's happening

PoC mentioned or linked in 1 signal
Technical details provided in 1 signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

PoC

1100.0%

Referenced assets1 URL

By indicator

https://undercodetesting.com/chamilo-lms-cve-2026-82535-predictable-invitation-codes-and-unescaped-output-enable-stored-xss-to-admin-backdoor-video/

Full discourse1 post

UNDERCODE TESTING@UndercodeUpdate46d
PoC
🚨 Chamilo LMS #CVE-2026-82535: Predictable Invitation Codes and Unescaped Output Enable Stored XSS to Admin Backdoor + Video -Prediction: 📈 2 Positive | 📉 2 Negative https://undercodetesting.com/chamilo-lms-cve-2026-82535-predictable-invitation-codes-and-unescaped-output-enable-stored-xss-to-admin-backdoor-video/ Educational Purposes!
Post summary
The post promotes a Chamilo LMS CVE‑2026‑82535 that allows a stored XSS via predictable invitation codes and unescaped output, linking to a video that demonstrates the exploit.
0000047
739 followersView on X

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