CVE-2026-21861 | baserproject basercms up to 5.2.2 exec os command injection (GHSA-qxmc-6f24-g86g)

VDB-354319 · CVE-2026-21861 · GHSA-QXMC-6F24-G86G BASERPROJECT BASERCMS UP TO 5.2.2 EXEC OS COMMAND INJECTION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 6.8 $0-$5k 1.97+ Summaryinfo A vulnerability was found in baserproject basercms up to 5.2.2. It has been rated as critical. This impacts the function exec. This manipulation causes os command injection. The identification of this vulnerability is CVE-2026-21861. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised. Detailsinfo A vulnerability was found in baserproject basercms up to 5.2.2. It has been declared as critical. Affected by this vulnerability is the function exec. The manipulation with an unknown input leads to a os command injection vulnerability. The CWE definition for the vulnerability is CWE-78. The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: 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. It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-21861 since 01/05/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1202 according to MITRE ATT&CK. Upgrading to version 5.2.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Productinfo Type Content Management System Vendor baserproject Name basercms Version 5.2.0 5.2.1 5.2.2 License open-source Website Product: https://github.com/baserproject/basercms/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 6.9 VulDB Meta Temp Score: 6.8 VulDB Base Score: 4.7 VulDB Temp Score: 4.5 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 9.1 CNA Vector (GitHub_M): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Os command injection CWE: CWE-78 / CWE-77 / CWE-74 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: basercms 5.2.3 Timelineinfo 01/05/2026 CVE reserved 03/31/2026 +84 days Advisory disclosed 03/31/2026 +0 days VulDB entry created 03/31/2026 +0 days VulDB entry last update Sourcesinfo Product: github.com Advisory: GHSA-qxmc-6f24-g86g Status: Confirmed CVE: CVE-2026-21861 (🔒) GCVE (CVE): GCVE-0-2026-21861 GCVE (VulDB): GCVE-100-354319 Entryinfo Created: 03/31/2026 08:15 Changes: 03/31/2026 08:15 (67) Complete: 🔍 Cache ID: 99:016:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸