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CVE-2026-4048 is an OS command injection vulnerability in the UI of Progress ADC products affecting the LoadMaster appliance. The flaw is triggered during upload of a custom WAF rule file, where unsanitized attacker-controlled input is processed in a way that allows operating system command execution. An authenticated attacker holding the product's “All” permission level can exploit this upload path to execute arbitrary commands on the appliance, resulting in remote code execution. The issue is classified as CWE-77 and was described by the vendor as a command injection vulnerability in the custom WAF rule file upload process.
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An authenticated command injection-related flaw involving custom WAF rule file upload in LoadMaster, referenced as part of the April 2026 vulnerability cluster.
A MOVEit WAF vulnerability mentioned only as background on Progress Software's security history.
An OS command injection vulnerability that can lead to remote code execution by authenticated attackers in affected Progress products.
An OS command injection vulnerability in the UI of Progress ADC Products that allows an authenticated attacker with "All" permissions to execute arbitrary commands on a LoadMaster appliance via unsanitized input in a custom WAF rule file during file upload.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.