CVE-2026-33698

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.3% (27th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3

Also known asEUVD-2026-21539 (ENISA EUVD)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.8Exploit: None knownExposed services: Not assessed

The CVE record names the fixed release — apply it.

Chamilo LMS is a learning management system. Prior to 1.11.38, a chained attack can enable otherwise-blocked PHP code from the main/install/ directory and allow an unauthenticated attacker to modify existing files or create new files where allowed by system permissions. This only affects portals with the main/install/ directory still present and read-accessible. This vulnerability is fixed in 1.11.38.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
59
EG Risk 59/100

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)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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: The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.3%
EPSS %ILE
27th
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 (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). 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 low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 3 days if the affected system is publicly exposed; 60 days 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 low or medium mission impact; Attend at high (mission-essential systems).

The CVE record names the fixed release. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact total (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)3 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (CISA Vulnrichment) · Technical impact total (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

April 10, 2026

Last Modified

October 26, 2026

Advisory Details (2)

Auto-updated Nov 7, 2026
Fix named in the CVE record. Sources: github, github_commit.
GitHub advisoryMentions a patch (unverified)

Unauthenticated RCE in main/install folder (<=1.11.36) · Advisory · chamilo/chamilo-lms · GitHub

https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-557g-2w66-gpmf
GitHub commit

commit d3355d7873c7 (chamilo/chamilo-lms)

Fix landed in chamilo/chamilo-lms commit d3355d7873c7 — awaiting tagged release

https://github.com/chamilo/chamilo-lms/commit/d3355d7873c7e5b907c5fa84cbd5d9b62ed33e51

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 31× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 253 rows on record for this CVE, as 99 entries (1 repeat merged).

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. 1 repeat row among the latest 100 is merged into the row it repeats. The 153 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-12 22:22 UTCEchelonGraph re-scored
  2. 2026-11-12 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  3. 2026-11-12 00:00 UTCEchelonGraph re-scored
  4. 2026-11-11 16:39 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  5. 2026-11-11 02:13 UTCEchelonGraph re-scored
  6. 2026-11-10 16:43 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  7. 2026-11-10 04:19 UTCEchelonGraph re-scored
  8. 2026-11-09 16:35 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  9. 2026-11-09 06:26 UTCEchelonGraph re-scored
  10. 2026-11-08 16:39 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  11. 2026-11-08 08:39 UTCEchelonGraph re-scored
  12. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  13. 2026-11-07 10:52 UTCEchelonGraph re-scored
  14. 2026-11-06 16:37 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  15. 2026-11-06 13:05 UTCEchelonGraph re-scored
  16. 2026-11-06 06:25 UTCOSV refresh
  17. 2026-11-05 16:37 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  18. 2026-11-04 17:30 UTCEchelonGraph re-scored
  19. 2026-11-04 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  20. 2026-11-03 19:43 UTCEchelonGraph re-scored
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  22. 2026-11-02 21:57 UTCEchelonGraph re-scored
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  24. 2026-11-02 00:10 UTCEchelonGraph re-scored
  25. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
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  1. 2026-11-01 02:21 UTCEchelonGraph re-scored
  2. 2026-10-31 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  3. 2026-10-31 04:34 UTCEchelonGraph re-scored
  4. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  5. 2026-10-30 06:47 UTCEchelonGraph re-scored
  6. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  7. 2026-10-29 09:01 UTCEchelonGraph re-scored
  8. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-10-28 11:14 UTCEchelonGraph re-scored
  10. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  11. 2026-10-26 21:28 UTCEchelonGraph re-scored
  12. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  13. 2026-10-25 16:47 UTCEchelonGraph re-scored
  14. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  15. 2026-10-25 14:34 UTCEchelonGraph re-scored
  16. 2026-10-24 19:00 UTCEchelonGraph re-scored
  17. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  18. 2026-10-23 21:13 UTCEchelonGraph re-scored
  19. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  20. 2026-10-22 23:26 UTCEchelonGraph re-scored
  21. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
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  23. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  24. 2026-10-21 03:52 UTCEchelonGraph re-scored
  25. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  26. 2026-10-20 05:55 UTCEchelonGraph re-scored
  27. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  28. 2026-10-19 07:49 UTCEchelonGraph re-scored
  29. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  30. 2026-10-18 03:46 UTCEchelonGraph re-scored
  31. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  32. 2026-10-17 10:58 UTCEchelonGraph re-scored
  33. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  34. 2026-10-16 12:32 UTCEchelonGraph re-scored
  35. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  36. 2026-10-15 14:35 UTCEchelonGraph re-scored
  37. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  38. 2026-10-14 09:10 UTCEchelonGraph re-scored
  39. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  40. 2026-10-13 06:13 UTCEchelonGraph re-scored
  41. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  42. 2026-10-12 16:13 UTCEchelonGraph re-scored
  43. 2026-10-11 19:55 UTCEchelonGraph re-scored
  44. 2026-10-11 17:08 UTCEchelonGraph re-scored
  45. 2026-10-11 14:35 UTCEchelonGraph re-scored
  46. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  47. 2026-10-11 07:55 UTCOSV refresh
  48. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
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  59. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  60. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  61. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  62. 2026-09-21 20:18 UTCOSV refresh
  63. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.3% · 25th percentile
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  74. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.3% · 24th percentile

Frequently asked(5)

What is CVE-2026-33698?
CVE-2026-33698 is a critical-severity vulnerability; its CVE record was published on April 10, 2026. Chamilo LMS is a learning management system. Prior to 1.11.38, a chained attack can enable otherwise-blocked PHP code from the main/install/ directory and allow an unauthenticated attacker to modify existing files or create new files where allowed by system permissions. This only affects portals…
When was the CVE record for CVE-2026-33698 published?
The CVE record for CVE-2026-33698 was published on April 10, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 26, 2026; the record at its source may have been updated since.
Is CVE-2026-33698 actively exploited?
CVE-2026-33698 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (27th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33698?
CVE-2026-33698 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-33698?
The CVE record for CVE-2026-33698 names the fix: "This vulnerability is fixed in 1.11.38."

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