by Kastro
Paper/Archive/CVE-2026-91107

CVE-2026-91107

OS4ED openSIS-Classic — openSIS Classic 9.3 - Insecure Direct Object Reference (IDOR)

EPSS 0.2%CVSS 9.3
critical.is priorityof 100
31
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 14.9.149 × 203.0No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

openSIS Classic 9.3 allows an authenticated user with the built-in teacher role can select an arbitrary staff record through staff_id and cause the School Information update path to reset that selected account's password.

Affected

ProductAffectedFixed inSource
openSIS-Classic9.3–CNA

Scores by source

Fluid Attacks (CNA)9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

writeupfluidattacks.com/advisories/heartsrefgithub.com/OS4ED/openSIS-Classicpatchgithub.com/OS4ED/openSIS-Classic/commit/24bb530391a67c114cd4fe3dff65da7e070f5ed1