PatchTheCVECVE-2026-48558: SimpleHelp Authentication Bypass Vulnerability
CVE-2026-48558 is a critical-severity flaw (CVSS 10.0) affecting simplehelp, reported as exploited in the wild. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authentication flow. When OIDC authentication is configured, identity tokens submitted during login are accepted without verifying their cryptographic signature. In a vulnerable configuration, a remote, unauthenticated attacker can submit a forged token containing arbitrary identity claims to obtain a fully authenticated te
Why this priority
- Critical severity
- EPSS top 1%: very likely to be exploited
- Exploited in the wild (CISA KEV)
- Public exploit reference
- CISA SSVC: automatable with total technical impact
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 10.0 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 77.7% (top 1%) |
| CISA exploited list | Yes, fix due 2026-07-02 |
| Weakness | CWE-347 |
| Published | 2026-06-12 |
| Last modified | 2026-10-07 |
Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Exploited Added to the CISA Known Exploited Vulnerabilities list
- Deadline CISA due date for US federal agencies to patch
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- GitHub PoC: J4ck3LSyN-Gen2/CVE-2026-48558 (8 stars)
- Metasploit: SimpleHelp OIDC Authentication Bypass Remote Code Execution
- Nuclei scan template: SimpleHelp <=5.5.15 - OIDC JWT Authentication Bypass
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-48558?
simplehelp: upgrade to 5.5.16. Exact commands for each OS are on this page.
Is CVE-2026-48558 being exploited?
Yes. CVE-2026-48558 is on the CISA Known Exploited Vulnerabilities list, so treat it as patch-now.
What does CVE-2026-48558 affect?
CVE-2026-48558 affects simplehelp. Severity is critical (CVSS 10.0). SimpleHelp versions 5.5.15 and prior and 6.0 pre-release versions contain an authentication bypass vulnerability in the OIDC authentication flow. When OIDC authentication is configured, identity tokens submitted during login are accepted wi
How urgent is CVE-2026-48558?
Priority 98/100. Critical severity; EPSS top 1%: very likely to be exploited; Exploited in the wild (CISA KEV); Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action