How severe is CVE-2011-0508?

CVE-2011-0508 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2011-0508 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-0508?

CVE-2011-0508 affects Contao Contao Cms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-0508?

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

When was CVE-2011-0508 published?

CVE-2011-0508 was published on 2011-01-20 and last updated on 2026-06-16.

CVE-2011-0508

CVE-2011-0508 is a medium-severity vulnerability in Contao Contao Cms with a CVSS 2.0 base score of 4.3. 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 2.0 base score 4.3)
EPSS exploit prediction: 2% (77th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: Contao Contao Cms
Published: 2011-01-20
Last modified: 2026-06-16

Description

Cross-site scripting (XSS) vulnerability in system/modules/comments/Comments.php in Contao CMS 2.9.2, and possibly other versions before 2.9.3, allows remote attackers to inject arbitrary web script or HTML via the HTTP X_FORWARDED_FOR header, which is stored by system/libraries/Environment.php but not properly handled by a comments action to main.php.

Frequently asked questions

What is CVE-2011-0508?: Cross-site scripting (XSS) vulnerability in system/modules/comments/Comments.php in Contao CMS 2.9.2, and possibly other versions before 2.9.3, allows remote attackers to inject arbitrary web script or HTML via the HTTP X_FORWARDED_FOR header, which is stored by system/libraries/Environment.php but not properly handled by a comments action to main.php.
How severe is CVE-2011-0508?: CVE-2011-0508 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2011-0508 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (77th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-0508?: CVE-2011-0508 affects Contao Contao Cms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-0508?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-0508 published?: CVE-2011-0508 was published on 2011-01-20 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:contao:contao_cms:2.9.2:*:*:*:*:*:*:*

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