CVE-2026-34914 Overview
CVE-2026-34914 is a blind SQL injection vulnerability in Revive Adserver version 6.0.6 and earlier. The flaw resides in the zone-include.php script, which fails to sanitize user-supplied input before incorporating it into database queries. A low-privileged authenticated user can manipulate the clientid parameter to inject arbitrary SQL statements. Successful exploitation allows attackers to extract sensitive database contents, modify advertising data, and disrupt service availability. The maintainers addressed the issue by improving input validation across all parameters processed by the script. The vulnerability is tracked under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command).
Critical Impact
Authenticated attackers can perform blind SQL injection through the clientid parameter, compromising data integrity and availability of the Revive Adserver instance.
Affected Products
- Revive Adserver 6.0.6
- Revive Adserver versions prior to 6.0.6
- Deployments exposing zone-include.php to low-privileged users
Discovery Timeline
- 2026-06-23 - CVE-2026-34914 published to NVD
- 2026-06-23 - Last updated in NVD database
Technical Details for CVE-2026-34914
Vulnerability Analysis
The vulnerability resides in zone-include.php, a script that processes the clientid parameter without applying proper input sanitization or parameterized queries. When the script constructs SQL queries using the attacker-controlled value, injected SQL fragments alter the intended query logic. Because the application does not return query results directly to the user, exploitation takes the form of blind SQL injection. Attackers infer database content through boolean conditions or time-based payloads that change application response timing or behavior.
The issue carries a CWE-89 classification. Exploitation requires only low-level authentication, which makes it viable for any user with basic access to the advertising platform. Successful attacks can read arbitrary tables, including advertiser credentials and campaign data, and may permit destructive UPDATE or DELETE statements depending on database privileges. The EPSS estimate places this CVE in the 20th percentile, indicating active exploitation is not yet widely observed.
Root Cause
The root cause is missing input sanitization in zone-include.php. The clientid parameter is concatenated into SQL statements rather than passed through prepared statements or strict type casting. Any non-numeric or specially crafted payload reaches the database engine unaltered.
Attack Vector
The attack vector is network-based and requires authentication at a low privilege tier. An attacker sends crafted HTTP requests containing malicious payloads in the clientid parameter to the zone-include.php endpoint. Blind extraction techniques such as boolean-based or time-based SQL injection enable iterative data exfiltration.
No public proof-of-concept code is verified for this CVE. See the HackerOne Report #3653196 for additional technical context provided by the reporter.
Detection Methods for CVE-2026-34914
Indicators of Compromise
- Unusual HTTP requests to zone-include.php containing SQL keywords such as SELECT, UNION, SLEEP, or BENCHMARK in the clientid parameter
- Repeated requests with incrementally changing payloads, indicative of blind SQL extraction
- Database query logs showing malformed queries originating from the Revive Adserver application user
- Elevated response time variance for requests to zone-include.php, consistent with time-based injection
Detection Strategies
- Inspect web server access logs for non-numeric or encoded values in the clientid query parameter
- Enable database query auditing to capture statements generated by the Revive Adserver service account
- Deploy Web Application Firewall (WAF) signatures for common SQL injection patterns targeting zone-include.php
- Correlate authenticated session activity with anomalous query volumes from a single user
Monitoring Recommendations
- Monitor outbound traffic from the database host for unexpected data transfers that may signal exfiltration
- Track failed query rates and parse errors in the database engine logs
- Alert on any access to advertiser credential tables outside scheduled administrative operations
How to Mitigate CVE-2026-34914
Immediate Actions Required
- Upgrade Revive Adserver to a release later than 6.0.6 that incorporates the input validation fix
- Audit user accounts and revoke unnecessary low-privilege access to the advertising platform
- Review web server and database logs for evidence of historical exploitation against zone-include.php
- Rotate credentials for any service accounts whose data may have been exposed
Patch Information
The Revive Adserver maintainers improved input sanitization to ensure all parameters processed by zone-include.php are validated before use in SQL queries. Administrators should apply the vendor-provided update. Reference the HackerOne Report #3653196 for advisory details and tracking.
Workarounds
- Restrict network access to zone-include.php to trusted IP ranges through reverse proxy rules
- Deploy WAF rules that reject non-integer values in the clientid parameter
- Apply least-privilege principles to the database account used by Revive Adserver, limiting SELECT scope and removing write permissions where feasible
- Temporarily disable low-privileged user roles until the patch is applied
# Example WAF rule (ModSecurity) restricting clientid to integers
SecRule ARGS:clientid "!@rx ^[0-9]+$" \
"id:1003491,phase:2,deny,status:403,\
msg:'Non-numeric clientid blocked - CVE-2026-34914'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
