How severe is CVE-2021-3376?

CVE-2021-3376 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3376 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3376?

CVE-2021-3376 affects Cuppacms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3376?

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

When was CVE-2021-3376 published?

CVE-2021-3376 was published on 2021-12-14 and last updated on 2026-06-17.

CVE-2021-3376

CVE-2021-3376 is a high-severity vulnerability in Cuppacms with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (62nd percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Cuppacms
Published: 2021-12-14
Last modified: 2026-06-17

Description

An issue was discovered in Cuppa CMS Versions Before 31 Jan 2021 allows authenticated attackers to gain escalated privileges via a crafted POST request using the user_group_id_field parameter.

Frequently asked questions

What is CVE-2021-3376?: An issue was discovered in Cuppa CMS Versions Before 31 Jan 2021 allows authenticated attackers to gain escalated privileges via a crafted POST request using the user_group_id_field parameter.
How severe is CVE-2021-3376?: CVE-2021-3376 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3376 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (62nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3376?: CVE-2021-3376 affects Cuppacms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3376?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-3376 published?: CVE-2021-3376 was published on 2021-12-14 and last updated on 2026-06-17.

References

https://github.com/CuppaCMS/CuppaCMS/issues/12

Affected products (1)

cpe:2.3:a:cuppacms:cuppacms:*:*:*:*:*:*:*:*

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