How severe is CVE-2011-4090?

CVE-2011-4090 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-2011-4090 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4090?

CVE-2011-4090 affects S9y Serendipity. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2011-4090?

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

When was CVE-2011-4090 published?

CVE-2011-4090 was published on 2019-11-26 and last updated on 2026-06-16.

CVE-2011-4090

CVE-2011-4090 is a medium-severity vulnerability in S9y Serendipity 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: 3% (86th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-79
Affected product: S9y Serendipity
Published: 2019-11-26
Last modified: 2026-06-16

Description

Serendipity before 1.6 has an XSS issue in the karma plugin which may allow privilege escalation.

Frequently asked questions

What is CVE-2011-4090?: Serendipity before 1.6 has an XSS issue in the karma plugin which may allow privilege escalation.
How severe is CVE-2011-4090?: CVE-2011-4090 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-2011-4090 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (86th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4090?: CVE-2011-4090 affects S9y Serendipity. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2011-4090?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4090 published?: CVE-2011-4090 was published on 2019-11-26 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:s9y:serendipity:*:*:*:*:*:*:*:*

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