CVE-2026-34602

HIGHNVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 89% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.1Exploit: NoneExposed: 0

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

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
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: 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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
10.5%
KEV
Not listed

Published

April 14, 2026

Last Modified

April 22, 2026

Advisory Details (5)

Auto-updated Jun 14, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

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 12× in last 7d / 41× 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.

Showing the most recent 100 of 101 total refreshes for this CVE.

  1. 2026-07-24 14:17 UTCEPSS rescore
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  3. 2026-07-23 14:18 UTCEPSS rescore
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  5. 2026-07-23 03:09 UTCEG score recompute
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  74. 2026-05-20 17:14 UTCEG score recompute
  75. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-34602?
CVE-2026-34602 is a high vulnerability 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 CVE-2026-34602 disclosed?
CVE-2026-34602 was first published in the National Vulnerability Database on April 14, 2026, with the most recent update on April 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-34602 actively exploited?
CVE-2026-34602 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-34602, 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.

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