CVE-2026-34602

HIGHNVD 7.17.1
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 0.2% (10th 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-2026-22718 (ENISA EUVD)Source: ENISA EUVD

7.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, the /api/course_rel_users endpoint is vulnerable to Insecure Direct Object Reference (IDOR), allowing an authenticated attacker to modify the user parameter in the request body to enroll any arbitrary user into any course without proper authorization checks. The backend trusts the user-supplied input for the user field and performs no server-side verification that the requester owns the referenced user ID or has permission to act on behalf of other users. This enables unauthorized manipulation of user-course relationships, potentially granting unintended access to course materials, bypassing enrollment controls, and compromising platform integrity. This issue has been fixed in version 2.0.0-RC.3.

CVSS v3
7.1
EG Score
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100

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)
Severity71% × 45%
Impact severity (EG Severity): CVSS 7.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 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
0.2%
EPSS %ILE
10th
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 (7.1): severity, escalated by confirmed exploitation. This CVE's 7.1 is its impact severity (EG Severity), not escalated.

EG Severity
7.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.2% within 30 daysSource: FIRST EPSS. 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: 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.

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

April 14, 2026

Last Modified

July 24, 2026

Advisory Details (5)

Auto-updated Jun 14, 2026
Patch available. Sources: github_commit, github_release, github.
GitHub advisoryMentions a patch (unverified)

IDOR in /api/course_rel_users Allows Unauthorized Enrollment of Arbitrary Users into Courses (<=2.0-RC.2) · Advisory · chamilo/chamilo-lms · GitHub

https://github.com/chamilo/chamilo-lms/security/advisories/GHSA-x373-8j9j-g5pj
GitHub release Patch Available

v2.0.0 RC 3

Patch available: chamilo/chamilo-lms v2.0.0-RC.3 (pre-release)

https://github.com/chamilo/chamilo-lms/releases/tag/v2.0.0-RC.3
GitHub commit

commit c9c30cdc48af (chamilo/chamilo-lms)

Fix landed in chamilo/chamilo-lms commit c9c30cdc48af — awaiting tagged release

https://github.com/chamilo/chamilo-lms/commit/c9c30cdc48afae57cd6ab012ae2eceafd351a40e
GitHub commit

commit bd2ba34c2e74 (chamilo/chamilo-lms)

Fix landed in chamilo/chamilo-lms commit bd2ba34c2e74 — awaiting tagged release

https://github.com/chamilo/chamilo-lms/commit/bd2ba34c2e74475587e38c74c90c2934e69c8779
GitHub commit

commit 2a9f060fa9d5 (chamilo/chamilo-lms)

Fix landed in chamilo/chamilo-lms commit 2a9f060fa9d5 — awaiting tagged release

https://github.com/chamilo/chamilo-lms/commit/2a9f060fa9d50fc9a92ed93af774d2619642df92

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 38× 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 99 of 210 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 111 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  2. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.2% · 10th percentile
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  6. 2026-10-25 14:33 UTCEG score recompute
  7. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 28th percentile
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  9. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 28th percentile
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  15. 2026-10-18 03:45 UTCEG score recompute
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  18. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 28th percentile
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  23. 2026-10-12 16:12 UTCEG score recompute
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Show 74 more
  1. 2026-10-11 14:34 UTCEG score recompute
  2. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  3. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  4. 2026-10-10 19:33 UTCOSV refresh
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  6. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  7. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 27th percentile
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  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 27th percentile
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  12. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  13. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 27th percentile
  14. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 27th percentile
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  17. 2026-09-26 00:26 UTCEPSS rescoreEPSS 0.4% · 26th percentile
  18. 2026-09-21 06:49 UTCOSV refresh
  19. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 10th percentile
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  34. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 10th percentile
  35. 2026-09-02 04:58 UTCOSV refresh
  36. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.2% · 10th percentile
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  51. 2026-08-16 06:43 UTCEG score recompute
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  58. 2026-08-11 18:53 UTCEG score recompute
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  65. 2026-08-08 00:58 UTCEG score recompute
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  74. 2026-08-02 13:20 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-34602?
CVE-2026-34602 is a high-severity vulnerability; its CVE record was published on April 14, 2026. Chamilo LMS is an open-source learning management system. In versions prior to 2.0.0-RC.3, the /api/courserelusers endpoint is vulnerable to Insecure Direct Object Reference (IDOR), allowing an authenticated attacker to modify the user parameter in the request body to enroll any arbitrary user into…
When was the CVE record for CVE-2026-34602 published?
The CVE record for CVE-2026-34602 was published on April 14, 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 July 24, 2026; the record at its source may have been updated since.
Is CVE-2026-34602 actively exploited?
CVE-2026-34602 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (10th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-34602?
CVE-2026-34602 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-34602?
A fix for CVE-2026-34602 is available: update to the fixed version the vendor names in its advisory.

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