CVE-2026-48558
Actively exploited. CVE-2026-48558 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-29) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.
Public exploit code is available. Proof-of-concept or working exploit code for CVE-2026-48558 is indexed in GitHub PoC. Expect opportunistic scanning and exploitation attempts — prioritize remediation.
Serial number: AV26-642 Date: June 30, 2026 On May 26, 2026, SimpleHelp published a security update to address vulnerabilities in the following product: SimpleHelp – versions 5.5.0 to versions prior to 5.5.16 SimpleHelp – versions 6.0 to versions prior to 6.0 RC2 On June 29, 2026, Cybersecurity and Infrastructure Security Agency (CISA) added CVE-2026-48558 to their Known Exploited Vulnerabilities (KEV) Database. The Cyber Centre encourages users and administrators to review the provided web links and apply the necessary update. SimpleHelp 5.5 and 6.0 Security Fix SimpleHelp Release News CISA KEV: CVE-2026-48558
CSIRTS triage
- What
- This advisory addresses vulnerabilities in SimpleHelp software.
- Who is affected
- Users and administrators of SimpleHelp versions 5.5.0 to 5.5.16 and 6.0 to 6.0 RC2 are affected.
- Urgency
- Remediation is important as exploitation is known and vulnerabilities are present.
- Action
- Update to SimpleHelp version 5.5.16 or 6.0 RC2.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 63% of all EPSS-scored CVEs.
Exploit availability
Public exploit or proof-of-concept code for CVE-2026-48558 is indexed in these free datasets. Available exploit code raises real-world risk independent of the CVSS score.
- GitHub PoCPublic proof-of-concept repositories on GitHub reference this CVE.look it up ↗
Advisory coverage (3)
- unknownexploitedSimpleHelp security advisory (AV26-642)cccs · 2026-06-30
- highexploitedCISA Adds One Known Exploited Vulnerability to Catalogcisa · 2026-06-29
- criticalexploitedCVE-2026-48558: SimpleHelp Authentication Bypass Vulnerabilitycisa-kev · 2026-06-29
External references
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