CVE-2021-40637
CVE-2021-40637 is a medium-severity vulnerability in Os4ed Opensis with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 3.x base score 6.1)
- CVSS v2: 4.3
- EPSS exploit prediction: 1% (51st percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Os4ed Opensis
- Published:
- Last modified:
Description
OS4ED openSIS 8.0 is affected by cross-site scripting (XSS) in EmailCheckOthers.php. An attacker can inject JavaScript code to get the user's cookie and take over the working session of user.
Frequently asked questions
- What is CVE-2021-40637?
- OS4ED openSIS 8.0 is affected by cross-site scripting (XSS) in EmailCheckOthers.php. An attacker can inject JavaScript code to get the user's cookie and take over the working session of user.
- How severe is CVE-2021-40637?
- CVE-2021-40637 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
- Is CVE-2021-40637 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-40637?
- CVE-2021-40637 affects Os4ed Opensis. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-40637?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-40637 published?
- CVE-2021-40637 was published on 2022-03-03 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:os4ed:opensis:8.0:*:*:*:*:*:*:*
More vulnerabilities in Os4ed Opensis
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- CVE-2025-22929 — Critical (CVSS 9.8): OS4ED openSIS v7.0 to v9.1 was discovered to contain a SQL injection vulnerability via the filter_id parameter at…
- CVE-2025-22926 — Critical (CVSS 9.8): An issue in OS4ED openSIS v8.0 through v9.1 allows attackers to execute a directory traversal by sending a crafted POST…
- CVE-2025-22928 — Critical (CVSS 9.8): OS4ED openSIS v7.0 to v9.1 was discovered to contain a SQL injection vulnerability via the cp_id parameter at…
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