Full Report
SimpleHelp security advisory (AV26-642)
Analysis Summary
# Vulnerability: SimpleHelp Remote Access Tool Vulnerability
## CVE Details
- **CVE ID:** CVE-2026-48558
- **CVSS Score:** Not specified in the advisory (The inclusion in CISA KEV typically implies a High or Critical severity)
- **CWE:** Not specified (Often associated with Improper Authentication or Remote Code Execution in this context)
## Affected Systems
- **Products:** SimpleHelp (Remote Support and Remote Access Software)
- **Versions:**
- 5.5.0 to versions prior to 5.5.16
- 6.0 to versions prior to 6.0 RC2
- **Configurations:** Default installations of the affected versions listed above.
## Vulnerability Description
While the provided briefing does not detail the specific technical root cause (e.g., buffer overflow, logic flaw), the vulnerability is critical enough to allow for unauthorized actions on the SimpleHelp server/agent. Given its inclusion in the CISA Known Exploited Vulnerabilities (KEV) catalog, it is typically used by attackers to gain initial access to managed networks or to execute arbitrary code.
## Exploitation
- **Status:** **Exploited in the wild.** (Added to CISA KEV on June 29, 2026).
- **Complexity:** Low (Based on typical KEV classifications for this product type).
- **Attack Vector:** Network (Remote).
## Impact
- **Confidentiality:** High (Potential access to remote session data and client info).
- **Integrity:** High (Potential for unauthorized configuration changes).
- **Availability:** High (Potential for service disruption or system takeover).
## Remediation
### Patches
SimpleHelp has released the following security updates to address this flaw:
- **SimpleHelp version 5.5.16**
- **SimpleHelp version 6.0 RC2** (or later)
### Workarounds
- No specific workarounds are provided. Immediate patching is the recommended course of action due to active exploitation.
- As a general security measure, ensure the SimpleHelp server is behind a VPN or restricted to known IP ranges to reduce the attack surface.
## Detection
- **Indicators of Compromise:** Monitor for unexpected administrative logins or the creation of new, unauthorized user accounts within the SimpleHelp dashboard. Watch for unusual outbound traffic from the SimpleHelp server.
- **Detection methods and tools:** Review server logs for entries corresponding to the update period or unauthorized access attempts. Check the CISA KEV catalog for updated remediation deadlines for federal agencies.
## References
- SimpleHelp 5.5 and 6.0 Security Fix: hxxps[://]simple-help[.]com/security/simplehelp-security-update-2026-05
- SimpleHelp Release News: hxxps[://]simple-help[.]com/release-news
- CISA KEV: hxxps[://]www[.]cisa[.]gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-48558