https://patchthecve.com/CVEs with upgrade or downgrade fix stepshttps://patchthecve.com/cve/CVE-2021-42332.htmlhttps://patchthecve.com/cve/CVE-2021-42332.htmlWed, 17 Jun 2026 04:09:39 +0000MEDIUM 4.3: The “List View” function of ShinHer StudyOnline System is not under authority control. After logging in with user’s privilege, remote attackers can access the content of other users’ message boards by crafting URL parameters.https://patchthecve.com/cve/CVE-2021-42331.htmlhttps://patchthecve.com/cve/CVE-2021-42331.htmlWed, 17 Jun 2026 04:09:39 +0000MEDIUM 5.4: The “Study Edit” function of ShinHer StudyOnline System does not perform permission control. After logging in with user’s privilege, remote attackers can access and edit other users’ tutorial schedule by crafting URL parameters.https://patchthecve.com/cve/CVE-2021-42330.htmlhttps://patchthecve.com/cve/CVE-2021-42330.htmlWed, 17 Jun 2026 04:09:39 +0000HIGH 8.8: The “Teacher Edit” function of ShinHer StudyOnline System does not perform authority control. After logging in with user’s privilege, remote attackers can access and edit other users’ credential and personal information by crafting URL parameters.https://patchthecve.com/cve/CVE-2021-42329.htmlhttps://patchthecve.com/cve/CVE-2021-42329.htmlWed, 17 Jun 2026 04:09:39 +0000MEDIUM 5.4: The “List_Add” function of message board of ShinHer StudyOnline System does not filter special characters in the title parameter. After logging in with user’s privilege, remote attackers can inject JavaScript and execute stored XSS attacks.