CVE-2026-30860
📋 TL;DR
This critical vulnerability in WeKnora allows unauthenticated attackers to execute arbitrary code on the database server by exploiting insufficient validation in PostgreSQL array/row expressions. Attackers can chain SQL injection with large object operations and library loading to achieve remote code execution. All WeKnora deployments before version 0.2.12 are affected.
💻 Affected Systems
- WeKnora
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the database server leading to data theft, lateral movement to other systems, and persistent backdoor installation.
Likely Case
Database compromise leading to sensitive data exfiltration, privilege escalation, and potential ransomware deployment.
If Mitigated
Limited impact if network segmentation prevents database server from accessing sensitive systems, though data breach still likely.
🎯 Exploit Status
Exploitation requires understanding of PostgreSQL array/row expressions and function chaining, but detailed advisory provides sufficient technical details for skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.2.12
Vendor Advisory: https://github.com/Tencent/WeKnora/security/advisories/GHSA-8w32-6mrw-q5wv
Restart Required: Yes
Instructions:
1. Stop WeKnora service. 2. Backup configuration and data. 3. Update to version 0.2.12 via package manager or manual installation. 4. Restart WeKnora service. 5. Verify functionality.
🔧 Temporary Workarounds
Network Segmentation
linuxRestrict database server network access to only required application servers
iptables -A INPUT -p tcp --dport 5432 -s [APP_SERVER_IP] -j ACCEPT
iptables -A INPUT -p tcp --dport 5432 -j DROP
Database User Privilege Reduction
allRemove dangerous PostgreSQL permissions from WeKnora database user
REVOKE EXECUTE ON FUNCTION lo_import FROM weknora_user;
REVOKE EXECUTE ON FUNCTION lo_export FROM weknora_user;
REVOKE EXECUTE ON FUNCTION pg_ls_dir FROM weknora_user;
🧯 If You Can't Patch
- Implement strict WAF rules to block SQL injection patterns in array/row expressions
- Deploy database activity monitoring to detect and alert on suspicious PostgreSQL function calls
🔍 How to Verify
Check if Vulnerable:
Check WeKnora version and compare against vulnerable range; examine application logs for unusual PostgreSQL array/row expression queriesCheck Version:
weknora --version or check package manager (apt list --installed | grep weknora)Verify Fix Applied:
Confirm version is 0.2.12 or later; test that malicious array/row expressions are properly rejected📡 Detection & Monitoring
Log Indicators:
- Unusual PostgreSQL array/row expression patterns in application logs
- Multiple failed query attempts with complex nested expressions
- Database logs showing lo_import, lo_export, or pg_ls_dir function calls from application user
Network Indicators:
- Unusual volume of database queries from single source
- SQL patterns containing array[...] or row(...) constructions with function calls
SIEM Query:
source="weknora.logs" AND ("array[" OR "row(") AND ("lo_import" OR "lo_export" OR "pg_ls_dir")