CVE-2026-91107
OS4ED openSIS-Classic
- OS4ED openSIS-Classic
- Critical
- CVSS 9.3
- EPSS 0.24%
- No fixed version listed
What to do
No fixed version listed
Affected products
| Product | Affected | Fixed in |
|---|---|---|
| OS4ED openSIS-Classic (Windows, MacOS, Linux) | 9.3 | None listed |
Advisories and fixes
- Patch github.com
Scores and signals
- Exploitation
- No known exploitation
- Severity
- Critical, CVSS 9.3 (v4.0, scored by Fluid Attacks)
- EPSS
- 0.24% chance of exploitation in the next 30 days (EPSS from FIRST, as of Oct 25, 2026)
- CISA's SSVC decision points
- Exploitation: none. Automatable: no. Technical impact: total. As of Oct 6, 2026.
- Weakness
- CWE-639: Authorization Bypass Through User-Controlled Key
- Vendor
- OS4ED, openSIS-Classic
Timeline
- First listed as critical by cve.now. Affected and fixed versions come from the CVE record, once one is published.