CVE-2026-63229 Overview
CVE-2026-63229 is a pre-authentication blind SQL injection vulnerability in Koollab LMS. An unauthenticated attacker can abuse the Single Sign-On (SSO) OAuth endpoint to execute time-based SQL queries against the backend database. The flaw allows extraction of personally identifiable information (PII), stored credentials, and valid JSON Web Tokens (JWTs) that enable account takeover. The vulnerability is tracked under CWE-89: Improper Neutralization of Special Elements used in an SQL Command.
Critical Impact
Unauthenticated attackers can extract JWT tokens from the database and hijack authenticated user sessions, including administrative accounts.
Affected Products
- Koollab LMS (SSO OAuth endpoint)
Discovery Timeline
- 2026-07-29 - CVE-2026-63229 published to NVD
- 2026-07-30 - Last updated in NVD database
Technical Details for CVE-2026-63229
Vulnerability Analysis
The vulnerability resides in the SSO OAuth endpoint of Koollab LMS. The endpoint accepts attacker-controlled input and concatenates it into an SQL statement without proper parameterization or sanitization. Because the endpoint is reachable prior to authentication, no credentials or user interaction are required to trigger the flaw.
The injection is blind, meaning the application does not return SQL errors or query results in HTTP responses. Attackers instead rely on a time-based oracle, using database sleep functions to infer data one bit or character at a time based on server response latency.
Successful exploitation compromises confidentiality and integrity of stored records. Attackers can enumerate database schemas, dump user records, extract password hashes, and read stored JWTs. Extracted JWTs remain valid until expiration and permit direct account takeover without further authentication.
Root Cause
The root cause is improper neutralization of special elements in SQL commands [CWE-89]. Input received through the SSO OAuth endpoint is incorporated into database queries without prepared statements or input validation, allowing injected SQL fragments to alter query logic.
Attack Vector
The attack vector is network-based and requires no authentication or user interaction. An attacker sends crafted OAuth requests containing SQL payloads that use conditional time delays. The attacker observes response times to reconstruct query results character by character. Refer to the CSA Security Advisory AL-2026-094 for advisory details.
No verified public exploit code is available. The vulnerability mechanism is described in prose only.
Detection Methods for CVE-2026-63229
Indicators of Compromise
- Repeated HTTP requests to the SSO OAuth endpoint with abnormally long server response times consistent with SQL sleep functions.
- Request parameters containing SQL keywords such as SLEEP, BENCHMARK, WAITFOR DELAY, pg_sleep, or conditional CASE WHEN structures.
- High request volumes from a single source IP targeting authentication or OAuth paths without completing a login flow.
- Unexpected use of valid JWTs from IP addresses or geolocations inconsistent with the legitimate user.
Detection Strategies
- Deploy web application firewall (WAF) signatures that identify time-based SQL injection payloads targeting OAuth and authentication endpoints.
- Correlate application access logs with database query duration metrics to surface anomalous latency patterns.
- Alert on repeated 200-status responses to the SSO OAuth endpoint where response time deviates significantly from baseline.
Monitoring Recommendations
- Enable verbose logging on the SSO OAuth endpoint, capturing full request bodies, query parameters, and response times.
- Monitor authentication logs for JWT reuse from multiple source IPs within short intervals.
- Track database session activity for unusual SLEEP-based queries originating from the LMS application user.
How to Mitigate CVE-2026-63229
Immediate Actions Required
- Apply the vendor patch for Koollab LMS as referenced in CSA Security Advisory AL-2026-094.
- Rotate all JWT signing secrets and invalidate existing tokens to revoke sessions that may have been exfiltrated.
- Force password resets for all user accounts, prioritizing administrative and privileged users.
- Audit database access logs for indicators of prior exploitation and data exfiltration.
Patch Information
Refer to the CSA Security Advisory AL-2026-094 for vendor-supplied remediation guidance. Vendor-specific patched version numbers were not provided in the NVD entry at time of publication.
Workarounds
- Restrict access to the SSO OAuth endpoint using network-layer controls or a reverse proxy allowlist until the patch is deployed.
- Deploy WAF rules that block requests containing common SQL injection payloads and time-delay functions.
- Disable the affected SSO OAuth flow if it is not required for business operations.
# Example WAF rule concept blocking time-based SQLi payloads on the OAuth endpoint
# (adapt to your WAF syntax; ModSecurity example)
SecRule REQUEST_URI "@beginsWith /oauth/sso" \
"phase:2,deny,status:403,id:1002026,\
chain,msg:'Potential SQLi against Koollab LMS SSO (CVE-2026-63229)'"
SecRule ARGS "@rx (?i)(sleep\s*\(|benchmark\s*\(|waitfor\s+delay|pg_sleep\s*\()" \
"t:none,t:urlDecodeUni"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
