How severe is CVE-2026-30877?

CVE-2026-30877 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-30877 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-30877?

CVE-2026-30877 affects Basercms. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-30877?

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.

Does CVE-2026-30877 have an EU (EUVD) identifier?

Yes. CVE-2026-30877 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17259.

When was CVE-2026-30877 published?

CVE-2026-30877 was published on 2026-03-31 and last updated on 2026-06-17.

CVE-2026-30877

CVE-2026-30877 is a critical-severity vulnerability in Basercms with a CVSS 3.x base score of 9.1. 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-78.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
EPSS exploit prediction: 2% (72nd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17259
Weakness: CWE-78
Affected product: Basercms
Published: 2026-03-31
Last modified: 2026-06-17

Description

baserCMS is a website development framework. Prior to version 5.2.3, there is an OS command injection vulnerability in the update functionality. Due to this issue, an authenticated user with administrator privileges in baserCMS can execute arbitrary OS commands on the server with the privileges of the user account running baserCMS. This issue has been patched in version 5.2.3.

Frequently asked questions

What is CVE-2026-30877?: baserCMS is a website development framework. Prior to version 5.2.3, there is an OS command injection vulnerability in the update functionality. Due to this issue, an authenticated user with administrator privileges in baserCMS can execute arbitrary OS commands on the server with the privileges of the user account running baserCMS. This issue has been patched in version 5.2.3.
How severe is CVE-2026-30877?: CVE-2026-30877 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-30877 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (72nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-30877?: CVE-2026-30877 affects Basercms. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-30877?: 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.
Does CVE-2026-30877 have an EU (EUVD) identifier?: Yes. CVE-2026-30877 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17259.
When was CVE-2026-30877 published?: CVE-2026-30877 was published on 2026-03-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:basercms:basercms:*:*:*:*:*:*:*:*

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