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Tronclass CVE-2026-110466

| EUVDEUVD-2026-100872 MEDIUM
Exposure of Sensitive System Information to an Unauthorized Control Sphere (CWE-497)
2026-10-14 twcert GHSA-277v-q825-2xgx
5.3
CVSS 4.0 · Vendor: twcert
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Authenticate to Tronclass as valid user
  2. Exploit
    Access anonymous grading feature
  3. Execution
    Bypass anonymity restriction via crafted request
  4. Impact
    Retrieve de-anonymized student information

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A01:2025 - Broken Access Control
ASVS 5.0
V14 - Data Protection System info exposure prevention
Exploitation Conditions

Exploitation requires the attacker to hold valid authenticated credentials on the target Tronclass instance (PR:L) and requires that the anonymous grading feature be in use for the targeted course/assignment - the vulnerability specifically allows bypassing the anonymous grading restriction to reveal student identities. There is no user interaction required (UI:N) and the attack is network-reachable (AV:N). Limiting factors: an attacker without a valid account cannot exploit this, and the exposure is confined to anonymous student information within graded submissions (Low confidentiality impact, no integrity or availability effect), so impact is scoped to a privacy/data-disclosure concern rather than system takeover.

Impact

This is a medium-severity information disclosure flaw (CVSS 5.3 via the vendor-supplied CVSS 4.0 vector AV:N/AC:L/PR:L/UI:N/VC:L) with no amplifying real-world exploitation signals. No EPSS score was provided in the input, there is no CISA KEV listing (KEV=NO), and no public exploit code was identified (POC=NO), so exploitation status is 'no public exploit identified at time of analysis.' The CVSS vector requires authentication (PR:L), meaning this is not a pre-auth mass-exploitable issue but rather an authenticated privilege/restriction-bypass against a specific application feature, which substantially lowers real-world urgency. The confidentiality impact is only Low (VC:L) and there is no integrity or availability impact (VI:N/VA:N), consistent with limited exposure of anonymous student grading data rather than full account or system compromise. No SSVC decision data was provided. Net assessment: a genuine but contained privacy/data-exposure issue of medium priority - prioritize patching in affected academic deployments, but this does not carry the hallmarks of a widely weaponized or urgently exploited vulnerability.

Exploit ScenarioDerived

An attacker with legitimate authenticated access to a Tronclass instance (e.g., a student or instructor account) manipulates requests to the grading functionality to bypass the anonymous-grading restriction. By doing so, they de-anonymize submissions and retrieve the identities and associated information of students who were supposed to remain anonymous. No public proof-of-concept exploit code was identified at the time of analysis.

This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
No patch listed yet 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Oct 14, 2026

WisdomGarden Tronclass, a learning management system, exposes anonymous student information to authenticated remote users who bypass the platform's anonymous grading restriction, as tracked under CVE-2026-110466. Exploitation requires valid credentials on the target instance (CVSS 3.1 vector PR:L, AV:N, no user interaction) and is only meaningful where the anonymous grading feature is actually in use for the targeted course or assignment; the resulting impact is limited to low confidentiality loss (privacy/disclosure of student identities behind anonymized submissions) with no integrity or availability effect. There is no public exploit identified at time of analysis and no KEV or EPSS signal amplifying real-world risk, so this rates as a medium-severity information-disclosure issue driven primarily by privacy exposure.

RemediationAI

No vendor-released patch identified at time of analysis - the CVE record and TWCERT/CC references provide no explicit fixed version, so administrators must confirm the remediated build directly with WisdomGarden and apply it as soon as the vendor publishes one, monitoring https://www.twcert.org.tw/tw/cp-132-11272-91666-1.html and https://www.twcert.org.tw/en/cp-139-11273-b9383-2.html for updates. Until a fix is confirmed and deployed, the most effective compensating control is to disable or refrain from using the anonymous grading feature for courses and assignments where student identity must remain confidential, accepting the trade-off that instructors lose blind-grading functionality and must grade with identities visible; if anonymous grading cannot be disabled, restrict access to the grading and submission endpoints to the smallest possible set of trusted instructor accounts, since the flaw is only exploitable by an authenticated user with access to those workflows. Additional hardening includes aggressively pruning stale, over-privileged, or shared Tronclass accounts (especially student and teaching-assistant roles) to shrink the pool of PR:L footholds, enabling audit logging on grading and submission views and alerting on anomalous retrieval of anonymized submissions, and treating the disclosed student identity data as a privacy incident requiring notification if exposure is detected. These measures reduce but do not eliminate risk, as a legitimate account holder with grading access may still reach the vulnerable logic; only a vendor fix reliably closes the restriction bypass.

Affected VersionsENISA

Tronclass 1.77
Tronclass 1.78

Affected Packages

euvd tronclass no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Tronclass is a commercial learning management system (LMS) developed by WisdomGarden and widely deployed in Taiwan and other APAC education environments; the affected scope is expressed by the wildcard CPE cpe:2.3:a:wisdomgarden:tronclass:*:*:*:*:*:*:*:*, meaning the vendor advisory does not pin the disclosure to a narrowly bounded version range. The root cause maps to CWE-497 (Exposure of Sensitive System Information to an Unauthorized Control Sphere): the platform's anonymous grading workflow is supposed to strip or mask student-identifying data from submissions so instructors can grade impartially, but the access-control logic governing that masking can be circumvented, letting an authenticated user retrieve the underlying student identity information associated with anonymized submissions. This is an authorization/logic deficiency in the anonymization layer rather than a memory-safety or injection flaw - there is no code execution, no data modification, and no denial of service, which is consistent with the CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N and all subsequent-system metrics N) and the independently assessed CVSS 3.1 vector (AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N). The weakness is only reachable by a user who already holds a valid account on the instance, so the practical threat model is an insider or low-privileged account holder (for example a student, teaching assistant, or instructor) probing grading-related endpoints, not an anonymous internet attacker.

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Severity by source

Vendor (twcert) PRIMARY 5.3 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
vuln.today AI 4.3 MEDIUM

Network-reachable (AV:N) with low complexity (AC:L) but requires an authenticated account (PR:L); only limited student data is disclosed, so C:L and I/A:N.

3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
4.0 AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (twcert).

CVSS VectorVendor: twcert

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
Low
User Interaction
None
Vulnerable system: Confidentiality
Low
Vulnerable system: Integrity
None
Vulnerable system: Availability
None
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

DescriptionCVE.org

Tronclass developed by WisdomGarden has a Sensitive Data Exposure vulnerability. Authenticated remote attackers can bypass anonymous grading restrictions and obtain anonymous student information.

Threat Intelligence Overview

EPSS Score
0.3%
Top 77% exploitable
Prevalence
Low
Tronclass LMS is niche academic software, concentrated in Taiwan/Asia universities
Data Quality
5 sources
Confidence: Medium

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.3%
Patch available No
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

26
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +26
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

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