CVE-2021-27309
CVE-2021-27309 is a medium-severity vulnerability in Csphere Clansphere 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: 2% (78th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-79
- Affected product: Csphere Clansphere
- Published:
- Last modified:
Description
Clansphere CMS 2011.4 allows unauthenticated reflected XSS via "module" parameter.
Frequently asked questions
- What is CVE-2021-27309?
- Clansphere CMS 2011.4 allows unauthenticated reflected XSS via "module" parameter.
- How severe is CVE-2021-27309?
- CVE-2021-27309 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-2021-27309 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-27309?
- CVE-2021-27309 affects Csphere Clansphere. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-27309?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- When was CVE-2021-27309 published?
- CVE-2021-27309 was published on 2021-03-23 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:a:csphere:clansphere:2011.4:*:*:*:*:*:*:*
More vulnerabilities in Csphere Clansphere
- CVE-2012-10034 — High (CVSS 7.5): ClanSphere 2011.3 is vulnerable to a local file inclusion (LFI) flaw due to improper handling of the cs_lang cookie…
- CVE-2010-1865 — High (CVSS 7.5): Multiple SQL injection vulnerabilities in ClanSphere 2009.0.3 and earlier allow remote attackers to execute arbitrary…
- CVE-2022-43119 — Medium (CVSS 6.1): A cross-site scripting (XSS) vulnerability in Clansphere CMS v2011.4 allows attackers to execute arbitrary web scripts…
- CVE-2021-27310 — Medium (CVSS 6.1): Clansphere CMS 2011.4 allows unauthenticated reflected XSS via "language" parameter.
- CVE-2011-3714 — Medium (CVSS 5.0): ClanSphere 2010.0 allows remote attackers to obtain sensitive information via a direct request to a .php file, which…
- CVE-2014-100010 — Medium (CVSS 4.3): Cross-site scripting (XSS) vulnerability in ClanSphere 2011.4 allows remote attackers to inject arbitrary web script or…
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