EUVD-2026-68881
GHSA-7898-m6ph-pvx5
Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Network-accessible REST endpoint requires a low-privilege teacher session; account deletion yields high integrity and availability impact with no confidentiality exposure.
Primary rating from Vendor (mitre).
CVSS VectorVendor: mitre
Lifecycle Timeline
4DescriptionCVE.org
The teacher-end interface POST /api/teacher/user/delete/{id} in XueZhiSi Open Source Exam System <= 3.9.0 contains a vertical privilege escalatio vulnerability. This interface accepts a user ID and then executes getUserById(id), setDeleted(true), updateByIdFilter() in sequence, without any validation of whether the current user has the authority to delete the target user. An authenticated teacher user (role=2) can delete an administrator account (role=3), constituting a vertical privilege escalation where a lower-privileged user performs a high-privileged operation.
AnalysisAI
Vertical privilege escalation in XueZhiSi XZS Open Source Exam System (versions <= 3.9.0) allows an authenticated teacher account (role=2) to permanently delete administrator accounts (role=3) via the POST /api/teacher/user/delete/{id} REST endpoint. The three-step delete sequence - getUserById(id), setDeleted(true), updateByIdFilter() - executes without any role-based authorization check on the target resource, enabling a lower-privileged user to destroy privileged accounts irreversibly. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires a valid authenticated teacher session (role=2) on the target XZS instance - a lower-privileged credential is not sufficient to reach this endpoint, and unauthenticated access is blocked. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 8.1 (AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H) accurately reflects the attack profile: network-reachable, low complexity, requiring only a low-privilege authenticated session, with high integrity and availability impact from irreversible account deletion. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | An upstream fix has been committed and is visible as a GitHub diff at github.com/mindskip/xzs/compare/master...1258129581:xzs:patch-2; however, no formally tagged patched release version has been independently confirmed, so operators should monitor the repository for a versioned release and apply it as soon as it becomes available. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: audit XZS access logs for suspicious /api/teacher/user/delete endpoint activity and review any recent administrator account deletions for unauthorized changes. …
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External POC / Exploit Code
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