CVE-2026-8037: Progress LoadMaster Command Injection Vulnerability

What it is

Progress LoadMaster contains a command injection vulnerability that allows an un-authenticated attacker to execute arbitrary commands on the LoadMaster appliance by exploiting unsanitized input in multiple command endpoints.

What to do

Treat this as urgent. Identify every affected system, starting with anything internet-facing, and apply the vendor fix or mitigation within days. If you cannot patch quickly, isolate or disable the affected service and watch for signs of compromise.

Priority

Act now: Patch or mitigate internet-facing systems within days.

Severity (CVSS)

9.6 critical

CISA assessment (SSVC)

actively exploited; needs manual effort per target; total control of the affected system

Exploit probability (EPSS, 30 days)

77%, in the top 1% of all CVEs

Added to CISA KEV

7 August 2026

CISA fix-by date

10 August 2026 (US federal agencies; a sensible deadline for everyone)

Ransomware use

Not known

Weakness

CWE-77

References

• NIST NVD entry
• CISA KEV entry
• community.progress.com/s/article/LoadMaster-Critical-Security-Bulletin-June-2026
• labs.watchtowr.com/enterprise-tech-in-shell-out-progress-kemp-loadmaster-uniniti
• www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-8037
• www.esentire.com/security-advisories/progress-kemp-loadmaster-vulnerability-targ

Sources: CISA Known Exploited Vulnerabilities · FIRST Exploit Prediction Scoring System (EPSS) · NIST National Vulnerability Database · CISA Vulnrichment (SSVC), via the CVE Program. This product uses data from the NVD API but is not endorsed or certified by the NVD. Summaries are machine-written from CISA’s description; treat the vendor’s advisory as the authority for fixes.