How severe is CVE-2020-36388?

CVE-2020-36388 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-2020-36388 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36388?

CVE-2020-36388 affects Civicrm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-36388?

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-2020-36388 published?

CVE-2020-36388 was published on 2021-06-17 and last updated on 2026-06-17.

CVE-2020-36388

CVE-2020-36388 is a high-severity vulnerability in Civicrm 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-434.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 6.5
EPSS exploit prediction: 1% (71st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-434
Affected product: Civicrm
Published: 2021-06-17
Last modified: 2026-06-17

Description

In CiviCRM before 5.21.3 and 5.22.x through 5.24.x before 5.24.3, users may be able to upload and execute a crafted PHAR archive.

Frequently asked questions

What is CVE-2020-36388?: In CiviCRM before 5.21.3 and 5.22.x through 5.24.x before 5.24.3, users may be able to upload and execute a crafted PHAR archive.
How severe is CVE-2020-36388?: CVE-2020-36388 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-2020-36388 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (71st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36388?: CVE-2020-36388 affects Civicrm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-36388?: 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-2020-36388 published?: CVE-2020-36388 was published on 2021-06-17 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:civicrm:civicrm:*:*:*:*:*:*:*:*

More vulnerabilities in Civicrm

CVE-2018-1999022 — Critical (CVSS 9.8): PEAR HTML_QuickForm version 3.2.14 contains an eval injection (CWE-95) vulnerability in HTML_QuickForm's getSubmitValue…
CVE-2013-5957 — High (CVSS 7.5): Multiple SQL injection vulnerabilities in CRM/Core/Page/AJAX/Location.php in CiviCRM before 4.2.12, 4.3.x before 4.3.7,…
CVE-2013-4662 — Medium (CVSS 6.5): The Quick Search API in CiviCRM 4.2.0 through 4.2.9 and 4.3.0 through 4.3.3 allows remote authenticated users to bypass…
CVE-2025-65187 — Medium (CVSS 6.1): A Stored Cross Site Scripting vulnerability exists in CiviCRM before v6.7 in the Accounting Batches field. An…
CVE-2011-5239 — Medium (CVSS 5.8): CiviCRM 4.0.5 and 4.1.1 does not verify that the server hostname matches a domain name in the subject's Common Name…
CVE-2023-25440 — Medium (CVSS 5.4): Stored Cross Site Scripting (XSS) vulnerability in the add contact function CiviCRM 5.59.alpha1, allows attackers to…

All CVEs affecting Civicrm →

Other CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities

CVE-2026-48283 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Unrestricted Upload of File with Dangerous Type…
CVE-2026-48276 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Unrestricted Upload of File with Dangerous Type…
CVE-2026-57700 — Critical (CVSS 10.0): Unrestricted Upload of File with Dangerous Type vulnerability in Daan.Dev OMGF Pro allows Using Malicious Files. This…
CVE-2025-69129 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in WordPress & WooCommerce Scraper Plugin, Import Data from Any Site <= 1.0.7…
CVE-2026-40772 — Critical (CVSS 10.0): Unauthenticated Arbitrary File Upload in GeekyBot <= 1.2.2 versions.
CVE-2026-40412 — Critical (CVSS 10.0): Unrestricted upload of file with dangerous type in Azure Orbital Spatio allows an unauthorized attacker to execute code…

Browse all CWE-434 (Unrestricted Upload of File with Dangerous Type) vulnerabilities →