openSIS Community Edition version 7.3 is vulnerable to SQL injection via the USERNAME parameter of index.php.

published 2020-08-24 6y ago modified 2026-06-17 4mo ago also EUVD-2020-27785

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 17.6%; EPSS 17.6% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known, plus a Nuclei check

Patch / fix

links 1

github.com/OS4ED/openSIS-Responsive-Design@1127ae0 commit

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Exploit prediction

17.58% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

Nuclei template OpenSIS 7.3 - SQL Injection nuclei detection template
cinzinga.com https://cinzinga.com/CVE-2020-6637/ referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	7.5	AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness

CWE-89 Improper Neutralization of Special Elements used in an SQL Command

References

github.com /OS4ED/openSIS-Responsive-Design/commit/1127ae0bb7c3a2883febeabc6b71ad8d73510de8
patch, third-party-advisory
cinzinga.com /CVE-2020-6637/
exploit, technical-description, third-party-advisory
opensis.com /
product
sourceforge.net /projects/opensis-ce/files/
third-party-advisory

Sources

CVE List CVE-2020-6637
NVD CVE-2020-6637

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