CVE-2026-61518 ispconfig CVE debrief

Who should care

Defenders responsible for ISPConfig installations, API security, and database protection should assess exposure and apply mitigations. This vulnerability affects API users with low-privilege function permissions, allowing for significant data manipulation and extraction.

Why it matters

CVE-2026-61518 is a high-severity authenticated SQL injection vulnerability in ISPConfig's Remote API. Defenders should prioritize verifying exposure and applying patches or mitigations to prevent arbitrary SQL injection and data extraction.

• Arbitrary SQL injection and data extraction via blind boolean inference
• Potential for data tampering and unauthorized access to sensitive records
• Risk of elevated privileges through exploitation of low-privilege API users
• Need for verification of exposure and application of patches or mitigations

Technical summary

The ISPConfig Remote API contains an authenticated SQL injection vulnerability. The primary_id parameter in delete and update API methods is concatenated into SQL WHERE clauses without proper protection. An attacker with low-privilege API access can inject SQL to manipulate records and extract data, including password hashes and client records. This vulnerability affects API users with low-privilege function permissions, allowing for significant data manipulation and extraction. Defenders should prioritize verifying exposure and applying patches or mitigations to prevent arbitrary SQL injection and data extraction.

Defensive priority

Defenders should prioritize verifying exposure and applying patches or mitigations, as the vulnerability allows for arbitrary SQL injection and data extraction.

Recommended defensive actions

• Verify exposure by checking API user permissions and SQL injection protections
• Apply patches or mitigations to prevent SQL injection
• Monitor for suspicious database activity
• Restrict API access to necessary users and functions
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but additional information from vendor sources is limited. The vulnerability's impact and remediation require verification from official sources.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.