Is CVE-2011-4850 being actively exploited?

CVE-2011-4850 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2011-4850?

CVE-2011-4850 has a CVSS 2.0 base score of 4.3 (MEDIUM).

CVE-2011-4850

MEDIUM · CVSS 4.3EPSS 1.0%EU EUVD

The Control Panel in Parallels Plesk Panel 10.4.4_build20111103.18 does not include the HTTPOnly flag in a Set-Cookie header for a cookie, which makes it easier for remote attackers to obtain potentially sensitive information via script access to this cookie, as demonstrated by cookies used by help.php and certain other files.

Key facts

CVSS score: 4.3 (v2.0)
Severity: MEDIUM
CVSS vector: AV:N/AC:M/Au:N/C:P/I:N/A:N
Weakness (CWE): CWE-200
EPSS score: 1.0% (62th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2011-4768)
Published: December 16, 2011
NVD last modified: June 16, 2026
Status: Modified

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2011-4768 in the EU Vulnerability Database. Last updated in EUVD on September 17, 2024.

View on the EU Vulnerability Database

Affected products

microsoft / windows 2003 server
microsoft / windows server 2008
parallels / parallels plesk panel

References

http://xss.cx/kb/parallels/xss-parallelspleskpanel.v10.4.4_build20111103.18-os_windows-2003-2008-reflected-cross-site-scripting-cwe79-capec86-javascript-injection-example-poc-report.html

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

Query CVEs from your AI assistant

The CVE/NVD Explorer brain answers CVE questions directly inside Claude, ChatGPT, or any MCP assistant — always up to date, no setup. Add it once and stop pasting advisories into chat.

Add the CVE brain