How severe is CVE-2016-11020?

CVE-2016-11020 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-11020 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-11020?

CVE-2016-11020 affects Kunena. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2016-11020?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2016-11020 published?

CVE-2016-11020 was published on 2020-02-25 and last updated on 2026-06-17.

CVE-2016-11020

CVE-2016-11020 is a critical-severity vulnerability in Kunena with a CVSS 3.x base score of 9.8. 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-434.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Kunena
Published: 2020-02-25
Last modified: 2026-06-17

Description

Kunena before 5.0.4 does not restrict avatar file extensions to gif, jpeg, jpg, and png. This can lead to XSS and remote code execution.

Frequently asked questions

What is CVE-2016-11020?: Kunena before 5.0.4 does not restrict avatar file extensions to gif, jpeg, jpg, and png. This can lead to XSS and remote code execution.
How severe is CVE-2016-11020?: CVE-2016-11020 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-11020 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-11020?: CVE-2016-11020 affects Kunena. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2016-11020?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2016-11020 published?: CVE-2016-11020 was published on 2020-02-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:kunena:kunena:*:*:*:*:*:joomla\!:*:*

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