Vulnerability · Published Jul 14, 2026 · Assigned by Fluid Attacks
CVE-2026-11944openSIS Classic 9.3 - Authenticated path traversal in SentMail attachment download
Medium 5.3
In plain English
A medium-severity path traversal in openSIS-Classic from OS4ED. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).
Severity (CVSS 4.0)5.3Medium
Exploit odds (30 days)0.5%top 58.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
openSIS Classic 9.3 contains an authenticated path traversal vulnerability in the legacy messaging sent-mail attachment download functionality that allows an authenticated attacker to read arbitrary files on the server via crafted path traversal sequences.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| OS4ED | openSIS-Classic | 9.3 |
Weakness: CWE-22 · Vector: 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
References
- https://fluidattacks.com/es/advisories/toto third-party-advisory
- https://github.com/OS4ED/openSIS-Classic product