Is CVE-2011-4555 being actively exploited?

CVE-2011-4555 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2011-4555?

CVE-2011-4555 has a CVSS 2.0 base score of 4.0 (MEDIUM).

CVE-2011-4555

MEDIUM · CVSS 4.0EPSS 0.9%EU EUVD

One Click Orgs before 1.2.3 does not require unique e-mail addresses for user accounts, which allows remote authenticated users to cause a denial of service (login disruption) or spoof votes or comments by selecting a conflicting e-mail address.

Key facts

CVSS score: 4.0 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness (CWE): CWE-255
EPSS score: 0.9% (59th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2011-4481)
Published: December 6, 2011
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2011-4481 in the EU Vulnerability Database. Last updated in EUVD on September 16, 2024.

View on the EU Vulnerability Database

Affected products

oneclickorgs / one click orgs
oneclickorgs / one click orgs
oneclickorgs / one click orgs
oneclickorgs / one click orgs
oneclickorgs / one click orgs
oneclickorgs / one click orgs
oneclickorgs / one click orgs

References

Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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