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Advisory record · GHSA-m9g7-rgfc-jcm7

baserCMS Update Functionality Vulnerable to OS Command Injection

CVSS 9.1 CriticalCriticalEPSS 0.015 · 75th percentile

Critical, because:

  • CVSS score 9.1: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 31 Mar 2026, 22:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
baserproject/basercmsPackagist<5.2.35.2.3
Identifiers
GHSA-m9g7-rgfc-jcm7 · CVE-2026-30877 · PKSA-mr15-f3n3-4vy5
Weakness (CWE)
CWE-78
Tags
Published
31 Mar 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

baserCMS (Packagist package baserproject/basercms) versions before 5.2.3 contain an OS command injection flaw in the update functionality. An attacker needs an authenticated account with administrator privileges, and can then run arbitrary operating system commands on the server with the privileges of the user running baserCMS. Upgrade to version 5.2.3, which is the fixed release.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.1 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.015, the 75th percentile, on 15 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:02 UTC First seen by agentprime
  2. 31 Oct 2026, 14:02 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.