CVE-2026-82535

MEDIUMPre-NVD 6.16.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to the CVSS score beside it.

Score 6.1 from GitHub Security Advisory published 2026-09-11. The CNA's CVSS baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: the CNA's CVSS, EPSS, GitHub Security Advisory

Also known asEUVD-2026-76159 (ENISA EUVD) · GHSA-xf2f-2vj2-6hfr (GitHub Security Advisories)Source: ENISA EUVD

6.1EG
EchelonGraph verdictMonitorRemediate within your standard update timelines (the SSVC decision on this page).
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 6.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity61% × 45%
Impact severity (EG Severity): CVSS 6.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.5% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.5%
EPSS %ILE
40th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (6.1): severity, escalated by confirmed exploitation. This CVE's 6.1 is its impact severity (EG Severity), not escalated.

EG Severity
6.1 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

September 11, 2026

Last Modified

October 1, 2026

Advisory Details (5)

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

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 8× in last 7d / 52× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 118 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 18 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-02 16:46 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  2. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  3. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  4. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  5. 2026-10-30 01:25 UTCOSV refresh
  6. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  7. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  8. 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  9. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-10-25 13:58 UTCEG score recompute
  12. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  13. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  15. 2026-10-22 13:43 UTCEG score recompute
  16. 2026-10-22 13:43 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  17. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  18. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  19. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  20. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  21. 2026-10-18 03:08 UTCEG score recompute
  22. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  23. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  24. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  25. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 39th percentile
Show 75 more
  1. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  2. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  3. 2026-10-12 14:55 UTCEG score recompute
  4. 2026-10-11 19:19 UTCEG score recompute
  5. 2026-10-11 16:36 UTCEG score recompute
  6. 2026-10-11 13:54 UTCEG score recompute
  7. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  8. 2026-10-11 06:56 UTCEG score recompute
  9. 2026-10-11 06:56 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  10. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  11. 2026-10-10 02:49 UTCEG score recompute
  12. 2026-10-10 02:49 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  13. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  14. 2026-10-09 01:32 UTCEG score recompute
  15. 2026-10-09 01:32 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  16. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.5% · 39th percentile
  17. 2026-10-08 00:21 UTCEG score recompute
  18. 2026-10-08 00:21 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  19. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-10-06 23:11 UTCEG score recompute
  21. 2026-10-06 23:11 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  22. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  23. 2026-10-05 22:02 UTCEG score recompute
  24. 2026-10-05 22:02 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  25. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  26. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  27. 2026-10-04 20:26 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  28. 2026-10-03 18:55 UTCEG score recompute
  29. 2026-10-03 18:55 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  30. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  31. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  32. 2026-10-02 16:42 UTCEG score recompute
  33. 2026-10-02 16:42 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  34. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  35. 2026-10-01 15:26 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  36. 2026-10-01 03:00 UTCEG score recompute
  37. 2026-10-01 03:00 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  38. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  39. 2026-09-30 01:49 UTCEG score recompute
  40. 2026-09-30 01:49 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  41. 2026-09-28 16:16 UTCEG score recompute
  42. 2026-09-28 16:16 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  43. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  44. 2026-09-27 15:06 UTCEG score recompute
  45. 2026-09-27 15:05 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  46. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  47. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  48. 2026-09-26 13:54 UTCEG score recompute
  49. 2026-09-26 13:54 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  50. 2026-09-25 22:43 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  51. 2026-09-24 20:56 UTCEG score recompute
  52. 2026-09-24 20:56 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  53. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  54. 2026-09-24 10:53 UTCEG score recompute
  55. 2026-09-24 10:53 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  56. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  57. 2026-09-23 09:43 UTCEG score recompute
  58. 2026-09-23 09:43 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  59. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  60. 2026-09-22 08:32 UTCEG score recompute
  61. 2026-09-22 08:32 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  62. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  63. 2026-09-21 07:22 UTCEG score recompute
  64. 2026-09-21 07:22 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  65. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  66. 2026-09-20 06:09 UTCEG score recompute
  67. 2026-09-20 06:09 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  68. 2026-09-19 05:00 UTCEG score recompute
  69. 2026-09-19 05:00 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  70. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  71. 2026-09-18 03:50 UTCEG score recompute
  72. 2026-09-18 03:50 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  73. 2026-09-17 02:40 UTCEG score recompute
  74. 2026-09-17 02:39 UTCGHSA enrichmentGHSA-xf2f-2vj2-6hfr · GitHub CVSS 6.1
  75. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.3% · 19th percentile

Frequently asked(5)

What is CVE-2026-82535?
CVE-2026-82535 is a medium-severity vulnerability; its CVE record was 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 made public?
CVE-2026-82535 was made public on September 8, 2026: that is the date its CVE record's CNA, VulnCheck, gives for when the vulnerability was made public. The CVE record itself was published on September 11, 2026. EchelonGraph's copy of the record carries a last-modified date of October 1, 2026; the record at its source may have been updated since.
Is CVE-2026-82535 actively exploited?
CVE-2026-82535 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (40th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-82535?
CVE-2026-82535 has a CVSS base score of 6.1 (the CNA's own assessment, by vulncheck; NVD's own analysis pending).
How do I remediate CVE-2026-82535?
A fix for CVE-2026-82535 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-82535 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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