CVE-2026-82535

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreHIGH confidence

Score 6.1 from GitHub Security Advisory published 2026-09-11. a secondary CVSS source baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 6.1Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
6.1
EG Score
6.1(high)
EG Risk
28(Track)
EG Risk 28/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
38%
KEV
Not listed

Published

September 11, 2026

Last Modified

September 24, 2026

Advisory Details (5)

Auto-updated Sep 11, 2026
Patch available. Sources: github_release, github_commit.
generic

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

https://www.vulncheck.com/advisories/chamilo-lms-stored-xss-via-survey-answer-submission-in-reporting-php
github_commit

commit bea9cbcfc6ca (chamilo/chamilo-lms)

Fix landed in chamilo/chamilo-lms commit bea9cbcfc6ca — awaiting tagged release

https://github.com/chamilo/chamilo-lms/commit/bea9cbcfc6ca58f387c6c25bef2f15dc5df9d147
github_commit

commit c9d2614d7985 (chamilo/chamilo-lms)

Fix landed in chamilo/chamilo-lms commit c9d2614d7985 — awaiting tagged release

https://github.com/chamilo/chamilo-lms/commit/c9d2614d798571b94cef1cb61e605a2fc89f0386
github_commit

commit be45f2f2a293 (chamilo/chamilo-lms)

Fix landed in chamilo/chamilo-lms commit be45f2f2a293 — awaiting tagged release

https://github.com/chamilo/chamilo-lms/commit/be45f2f2a29319afbbf9ce27d094698911799d10
github_release Patch Available

v3.0.0

Patch available: chamilo/chamilo-lms v3.0.0

https://github.com/chamilo/chamilo-lms/releases/tag/v3.0.0

Vendor Advisories for CVE-2026-82535(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 43× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-24 20:56 UTCEG score recompute
  2. 2026-09-24 20:56 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 10:53 UTCEG score recompute
  5. 2026-09-24 10:53 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 09:43 UTCEG score recompute
  8. 2026-09-23 09:43 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 08:32 UTCEG score recompute
  11. 2026-09-22 08:32 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 07:22 UTCEG score recompute
  14. 2026-09-21 07:22 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 06:09 UTCEG score recompute
  17. 2026-09-20 06:09 UTCGHSA enrichment
  18. 2026-09-19 05:00 UTCEG score recompute
  19. 2026-09-19 05:00 UTCGHSA enrichment
  20. 2026-09-18 19:28 UTCEPSS rescore
  21. 2026-09-18 03:50 UTCEG score recompute
  22. 2026-09-18 03:50 UTCGHSA enrichment
  23. 2026-09-17 02:40 UTCEG score recompute
  24. 2026-09-17 02:39 UTCGHSA enrichment
  25. 2026-09-16 14:08 UTCEPSS rescore
Show 18 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-16 01:26 UTCEG score recompute
  3. 2026-09-16 01:26 UTCGHSA enrichment
  4. 2026-09-15 03:12 UTCEPSS rescore
  5. 2026-09-15 03:12 UTCEPSS rescore
  6. 2026-09-15 00:16 UTCGHSA enrichment
  7. 2026-09-13 23:06 UTCEG score recompute
  8. 2026-09-13 23:06 UTCGHSA enrichment
  9. 2026-09-12 21:56 UTCEG score recompute
  10. 2026-09-12 21:56 UTCGHSA enrichment
  11. 2026-09-11 20:46 UTCEG score recompute
  12. 2026-09-11 20:46 UTCGHSA enrichment
  13. 2026-09-11 19:28 UTCEG score recompute
  14. 2026-09-11 19:28 UTCGHSA enrichment
  15. 2026-09-11 18:34 UTCEG score recompute
  16. 2026-09-11 18:34 UTCGHSA enrichment
  17. 2026-09-11 17:19 UTCEG score recompute
  18. 2026-09-11 17:18 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-82535?
CVE-2026-82535 is a medium vulnerability published on September 11, 2026. 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.…
When was CVE-2026-82535 disclosed?
CVE-2026-82535 was first published in the National Vulnerability Database on September 11, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-82535 actively exploited?
CVE-2026-82535 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 61.7% of all scored CVEs.
What is the CVSS score of CVE-2026-82535?
CVE-2026-82535 has a CVSS v3 base score of 6.1 (NVD).
How do I remediate CVE-2026-82535?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-82535, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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