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CVE-2026-21861

Basercms command injection

9.1 CRITICALPublic exploitEPSS 2.28%
  1. Published30 Mar 2026

Description

baserCMS is a website development framework. Prior to version 5.2.3, baserCMS contains an OS command injection vulnerability in the core update functionality. An authenticated administrator can execute arbitrary OS commands on the server due to improper handling of user-controlled input that is directly passed to exec() without sufficient validation or escaping. This issue has been patched in version 5.2.3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredHigh
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

Basercms< 5.2.3

Remediation

Fixed in
Basercms≥ 5.2.3

References

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Frequently asked

Is CVE-2026-21861 being actively exploited?

CVE-2026-21861 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 2.28%.

How severe is CVE-2026-21861?

CVE-2026-21861 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 2.28% probability of exploitation.

Which products are affected by CVE-2026-21861?

Affected products include Basercms.

How do I fix CVE-2026-21861?

Upgrade affected software to a fixed version, for example Basercms 5.2.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-21861 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.