CVE-2026-1898 Overview
A vulnerability has been identified in WeKan, an open-source kanban board application, affecting versions up to 8.20. The vulnerability exists in the LDAP User Sync component, specifically within the file packages/wekan-ldap/server/syncUser.js. This security flaw involves improper access controls (CWE-266: Incorrect Privilege Assignment) that can be exploited remotely by authenticated attackers to potentially access or modify resources beyond their intended permissions.
Critical Impact
Authenticated attackers can exploit improper access controls in the LDAP User Sync functionality to potentially escalate privileges or access unauthorized resources within WeKan deployments.
Affected Products
- WeKan versions up to 8.20
- WeKan LDAP User Sync component (packages/wekan-ldap/server/syncUser.js)
Discovery Timeline
- February 5, 2026 - CVE-2026-1898 published to NVD
- February 5, 2026 - Last updated in NVD database
Technical Details for CVE-2026-1898
Vulnerability Analysis
This vulnerability stems from improper access control implementation within WeKan's LDAP user synchronization functionality. The affected component, syncUser.js, fails to properly enforce access restrictions during the LDAP user sync process. This allows authenticated users with low privileges to potentially perform actions or access data that should be restricted to higher-privileged users or administrators.
The network-accessible nature of this vulnerability means that any authenticated user on the network can potentially exploit this flaw without requiring physical access to the target system. The impact affects confidentiality, integrity, and availability to a limited degree, as attackers may be able to read, modify, or disrupt user synchronization processes.
Root Cause
The root cause of CVE-2026-1898 is classified as CWE-266 (Incorrect Privilege Assignment). The vulnerability arises from insufficient privilege validation in the LDAP user synchronization code. When processing user sync operations, the application fails to properly verify that the requesting user has appropriate permissions to perform the requested actions, leading to an improper access control condition.
Attack Vector
The attack vector for this vulnerability is network-based, requiring authenticated access to the WeKan application. An attacker must first have valid credentials to authenticate to the WeKan instance. Once authenticated, the attacker can manipulate LDAP user sync operations to exploit the improper access controls. The attack does not require user interaction and can be executed with low attack complexity.
The vulnerability manifests in the LDAP user synchronization process within packages/wekan-ldap/server/syncUser.js. Due to the nature of this access control flaw, attackers can potentially bypass intended authorization checks during the user sync workflow. For technical implementation details, refer to the GitHub commit 146905a which addresses this vulnerability.
Detection Methods for CVE-2026-1898
Indicators of Compromise
- Unusual LDAP sync operations initiated by low-privileged users
- Unexpected modifications to user accounts or permissions following LDAP sync events
- Authentication logs showing users accessing resources outside their normal permission scope
- Anomalous activity in WeKan application logs related to syncUser.js operations
Detection Strategies
- Monitor WeKan application logs for unauthorized LDAP sync operations and privilege escalation attempts
- Implement network monitoring to detect unusual patterns in LDAP synchronization traffic
- Review access control lists and user permissions for unauthorized changes
- Deploy SentinelOne Singularity platform to detect anomalous application behavior patterns
Monitoring Recommendations
- Enable detailed logging for WeKan LDAP operations and authentication events
- Set up alerts for failed or suspicious LDAP sync attempts
- Monitor for privilege changes or unauthorized user account modifications
- Implement regular audits of user permissions and access control configurations
How to Mitigate CVE-2026-1898
Immediate Actions Required
- Upgrade WeKan to version 8.21 or later immediately
- Review all user accounts and permissions for unauthorized changes
- Audit LDAP sync configurations and restrict access to administrative functions
- Implement network segmentation to limit exposure of WeKan instances
Patch Information
WeKan has released version 8.21 to address this vulnerability. The fix is available in commit 146905a459106b5d00b4f09453a6554255e6965a. Organizations running affected versions should upgrade immediately to mitigate the risk.
Workarounds
- Restrict network access to WeKan instances to trusted users and networks only
- Disable LDAP user synchronization temporarily if not critical to operations
- Implement additional authentication layers or access controls at the network level
- Review and harden LDAP integration configurations to enforce stricter access policies
# Upgrade WeKan to patched version
# For Docker deployments:
docker pull wekan/wekan:v8.21
docker-compose down && docker-compose up -d
# Verify the installed version
docker exec wekan-app cat /app/bundle/version.txt
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
