How severe is CVE-2011-4756?

CVE-2011-4756 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-4756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4756?

CVE-2011-4756 affects Parallels Parallels Plesk Small Business Panel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-4756?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-4756 published?

CVE-2011-4756 was published on 2011-12-16 and last updated on 2026-06-16.

CVE-2011-4756

CVE-2011-4756 is a medium-severity vulnerability in Parallels Parallels Plesk Small Business Panel with a CVSS 2.0 base score of 5.0. 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-200.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 1% (63rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Parallels Parallels Plesk Small Business Panel
Published: 2011-12-16
Last modified: 2026-06-16

Description

Parallels Plesk Small Business Panel 10.2.0 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 domains/sitebuilder_edit.php and certain other files.

Frequently asked questions

What is CVE-2011-4756?: Parallels Plesk Small Business Panel 10.2.0 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 domains/sitebuilder_edit.php and certain other files.
How severe is CVE-2011-4756?: CVE-2011-4756 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-4756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (63rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4756?: CVE-2011-4756 affects Parallels Parallels Plesk Small Business Panel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-4756?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4756 published?: CVE-2011-4756 was published on 2011-12-16 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:parallels:parallels_plesk_small_business_panel:10.2.0:*:*:*:*:*:*:*

More vulnerabilities in Parallels Parallels Plesk Small Business Panel

CVE-2011-4768 — Critical (CVSS 10.0): The Site Editor (aka SiteBuilder) feature in Parallels Plesk Small Business Panel 10.2.0 omits the Content-Type…
CVE-2011-4762 — Critical (CVSS 10.0): Parallels Plesk Small Business Panel 10.2.0 sends incorrect Content-Type headers for certain resources, which might…
CVE-2011-4761 — Critical (CVSS 10.0): Parallels Plesk Small Business Panel 10.2.0 omits the Content-Type header's charset parameter for certain resources,…
CVE-2011-4757 — Critical (CVSS 10.0): Parallels Plesk Small Business Panel 10.2.0 generates a password form field without disabling the autocomplete feature,…
CVE-2011-4755 — Critical (CVSS 10.0): Parallels Plesk Small Business Panel 10.2.0 does not properly validate string data that is intended for storage in an…
CVE-2011-4763 — High (CVSS 7.5): Multiple SQL injection vulnerabilities in the Site Editor (aka SiteBuilder) feature in Parallels Plesk Small Business…

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