What’s Vulnerable › Vulnerabilities

CVE-2021-27340

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-09-16 · updated 2026-06-17
• Weakness: CWE-79

Description

OpenSIS Community Edition version <= 7.6 is affected by a reflected XSS vulnerability in EmailCheck.php via the "opt" parameter.

Affected products

• OS4ED openSIS-Classic: through 7.6

References

• https://github.com/OS4ED/openSIS-Classic/commit/f78407d5291c686c3f416073dcb9143f3a3d5489#diff-24b751f2072f058259d033016938101f9fa29884ebcc09ce7eb88def3421e5ba
• https://github.com/OS4ED/openSIS-Classic/issues/158
• https://github.com/OS4ED/openSIS-Classic/releases
• https://github.com/OS4ED/openSIS-Classic/commit/f78407d5291c686c3f416073dcb9143f3a3d5489#diff-24b751f2072f058259d033016938101f9fa29884ebcc09ce7eb88def3421e5ba
• https://github.com/OS4ED/openSIS-Classic/issues/158
• https://github.com/OS4ED/openSIS-Classic/releases

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