CVE-2026-55721 StoneFly CVE debrief

Who should care

Organizations using StoneFly Storage Concentrator, particularly those in industrial control systems (ICS) environments, should be aware of this vulnerability and take steps to remediate it. This includes reviewing official advisories, verifying affected deployments, and implementing defensive measures to prevent exploitation.

Technical summary

The StoneFly Storage Concentrator is vulnerable to SQL injection through cookie values processed by the login.pl and debug.pl scripts. An unauthenticated remote attacker can manipulate database queries to extract sensitive information, including session tokens, password hashes, and stored secret keys. Organizations using StoneFly Storage Concentrator should prioritize upgrading to version 8.0.4.29 or later to address the SQL injection vulnerability. This vulnerability has a CVSS score of 9.3 and is considered critical.

Defensive priority

Organizations using StoneFly Storage Concentrator should prioritize upgrading to version 8.0.4.29 or later to address the SQL injection vulnerability.

Recommended defensive actions

• Upgrade to Storage Concentrator version 8.0.4.29 or later
• Implement additional security measures to detect and prevent SQL injection attacks
• Monitor systems for suspicious activity
• 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
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The source item from CISA CSAF provides details on the SQL injection vulnerability in StoneFly Storage Concentrator, including affected versions and recommended remediation. Organizations should verify their deployments and review official advisories for specific guidance. Defensive measures include monitoring for suspicious activity and implementing compensating controls where necessary. Evidence limits suggest focusing on vendor-supported updates and validating affected scope.

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.