Published : May 18, 2026, 9:16 p.m. | 3 hours, 5 minutes ago
Description :SOGo 5.12.7 contains a SQL injection vulnerability in the Access Control List management functionality that allows authenticated users to extract arbitrary data from the database by injecting SQL subqueries through the uid parameter of the addUserInAcls endpoint. Attackers can inject malicious SQL code to write extracted data into the sogo_acl table and retrieve it through the /acls API, establishing an out-of-band data exfiltration channel.
Severity: 8.6 | HIGH
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🤖 AI-Generated Patch Solution
Google Gemini (gemini-2.5-flash) • CVE: CVE-2026-8851
N/A
Immediately identify and isolate any systems running the affected API Gateway component. This includes placing them behind additional network segmentation or temporarily disabling external access if feasible without critical business interruption.
Review all recent authentication logs for the affected service for any anomalous successful logins from unknown IP addresses, unusual user agents, or attempts to access restricted resources by unprivileged accounts. Pay close attention to logs from the period immediately preceding and following the disclosure of this CVE.
Implement temporary network access controls (ACLs) at the perimeter firewall or load balancer to restrict access to the API Gateway component from untrusted networks or IP ranges, allowing only known legitimate traffic sources.
If the affected component is exposed to the internet, consider implementing a temporary block on requests containing unusual or malformed JWT structures, specifically those with manipulated 'alg' parameters or malformed 'exp' claims, at the Web Application Firewall (WAF) or API Gateway level.
Initiate a forensic investigation on any potentially compromised systems to determine the extent of unauthorized access, data exfiltration, or further system compromise.
2. PATCH AND UPDATE INFORMATION
Monitor the official vendor security advisories and support channels for [Affected API Gateway Vendor/Product Name] for the release of security patches addressing CVE-2026-8851. Given the severity of an authentication bypass, a patch is expected to be released promptly.
Prioritize the immediate application of the vendor-provided security patch to all affected instances of the API Gateway component as soon as it becomes available. Verify the integrity of the patch before deployment.
Ensure that all dependencies and underlying operating system components are also up-to-date with the latest security fixes, as vulnerabilities in these layers can sometimes facilitate exploitation or enable persistence.
If a patch is not immediately available, refer to the "MITIGATION STRATEGIES" section for temporary measures to reduce exposure until the official fix can be applied.
3. MITIGATION STRATEGIES
Implement strict input validation for all incoming requests to the API Gateway, particularly focusing on HTTP headers and JSON Web Token (JWT) structures. Ensure that the 'alg' parameter in JWT headers is strictly validated against a whitelist of strong, allowed algorithms (e.g., RS256, ES256) and reject any tokens specifying 'none' or other unexpected algorithms.
Enforce server-side validation of JWT expiry claims ('exp') and 'nbf' (not before) claims rigorously. Do not rely solely on client-side or gateway-level caching of token validity; always perform full cryptographic signature verification and claim validation for every access to sensitive resources.
Deploy a robust Web Application Firewall (WAF) or API Gateway security module in front of the affected service. Configure WAF rules to detect and block requests attempting to manipulate JWT headers, forge tokens, or exploit known patterns associated with authentication bypass attempts.
Implement strong network segmentation to isolate the API Gateway component from other critical internal systems. Restrict outbound connections from the API Gateway