How severe is CVE-2020-23837?

CVE-2020-23837 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2020-23837 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-23837?

CVE-2020-23837 affects Multi User Project Multi User. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-23837?

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-2020-23837 published?

CVE-2020-23837 was published on 2020-09-25 and last updated on 2026-06-17.

CVE-2020-23837

CVE-2020-23837 is a high-severity vulnerability in Multi User Project Multi User 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. The underlying weakness is classified as CWE-352.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.8
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-352
Affected product: Multi User Project Multi User
Published: 2020-09-25
Last modified: 2026-06-17

Description

A Cross-Site Request Forgery (CSRF) vulnerability in the Multi User plugin 1.8.2 for GetSimple CMS allows remote attackers to add admin (or other) users after an authenticated admin visits a third-party site or clicks on a URL.

Frequently asked questions

What is CVE-2020-23837?: A Cross-Site Request Forgery (CSRF) vulnerability in the Multi User plugin 1.8.2 for GetSimple CMS allows remote attackers to add admin (or other) users after an authenticated admin visits a third-party site or clicks on a URL.
How severe is CVE-2020-23837?: CVE-2020-23837 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2020-23837 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-23837?: CVE-2020-23837 affects Multi User Project Multi User. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-23837?: 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-2020-23837 published?: CVE-2020-23837 was published on 2020-09-25 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:multi_user_project:multi_user:1.8.2:*:*:*:*:getsimple_cms:*:*

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