SimpleHelp security advisory (AV26-642)
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.
⚡ Watch SimpleHelp
Get an email when a new SimpleHelp advisory drops — max one per day, one-click unsubscribe.
Details
Original advisory: https://cyber.gc.ca/en/alerts-advisories/simplehelp-security-advisory-av26-642
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Exploitation confirmedCVE-2026-48558Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 63% of all scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-48558 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- highexploitedCISA Adds One Known Exploited Vulnerability to Catalogcisa
- criticalexploitedCVE-2026-48558: SimpleHelp Authentication Bypass Vulnerabilitycisa-kev
More from Canadian Centre for Cyber Security
- unknownBitWarden security advisory (AV26-683)2026-07-10
- criticalAL25-007 - Vulnerability impacting Roundcube Webmail – CVE-2025-49113 – Update 12026-07-10
- unknownMicrosoft Edge security advisory (AV26-682)2026-07-10
- criticalBroadcom VMware security advisory (AV26-681)2026-07-10
- unknownDjango security advisory (AV26-084) – Update 12026-07-09