Exploited CVEs / CVE-2026-48558
CVE-2026-48558
SimpleHelp Authentication Bypass Vulnerability. Exploitation in the wild is confirmed by CISA, not predicted. Federal agencies were required to remediate by 2026-07-02 (that deadline has passed); treat that date as the outer bound for your own environment. Check the vendor security advisory for the fix.
Risk summary
Actively exploited SimpleHelp vulnerability, Critical severity, CVSS v3 10.0. Added to the CISA KEV catalog 2026-06-29.
Senserva AI Opinion for CVE-2026-48558
SimpleHelp remote support servers accept OIDC identity tokens without checking their cryptographic signature, so an unauthenticated attacker can forge a token and walk straight into the console. It carries a maximum CVSS of 10.0 and CISA confirmed active exploitation on 2026-06-29, which makes this a fresh in-the-wild threat despite the low 1% EPSS score. A compromised remote support server hands attackers the same access your help desk has to every managed endpoint.
Do this: Patch every SimpleHelp server today, and if OIDC login is enabled, review authentication logs for logins that lack a matching identity provider event.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-48558
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for CVE-2026-48558
- Published
- 2026-06-29
- Last revised
- 2026-06-29
- Changes tracked
- 1
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
The exploit probability of CVE-2026-48558 is RISING: EPSS 30% to 64% on 2026-09-11.
Drawn by Senserva Vivid from the Senserva change record. Hover any point for its date and value.
- 2026-06-29 added to the CISA KEV catalog by CISA
- 2026-07-17 CVSS 0.0 to 10.0; EPSS first scored at 1.2%
- 2026-07-24 EPSS 1.2% to 11.5%
- 2026-08-24 EPSS 11.5% to 12.4%
- 2026-09-03 EPSS 12.4% to 30.0%
- 2026-09-11 EPSS 30.0% to 64.3%
Recorded by Senserva on the dates shown, from CISA KEV and FIRST EPSS. This is what moved and when, which neither the vendor advisory nor NVD publishes.
CISA required action
Federal remediation due date: 2026-07-02 (past due).
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Official fix for CVE-2026-48558
Check the vendor's security advisory channel for the patched SimpleHelp versions and workarounds.
Common questions about CVE-2026-48558
Is CVE-2026-48558 actively exploited?
Yes. CVE-2026-48558 was added to the CISA Known Exploited Vulnerabilities (KEV) catalog on 2026-06-29, which means exploitation in the wild has been confirmed, not predicted. Its EPSS 30-day exploitation probability is 5.7%.
What is the CISA deadline and required action for CVE-2026-48558?
CISA set the federal remediation due date at 2026-07-02, which has passed; treat any unremediated system as overdue. The verbatim required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
What fixes CVE-2026-48558?
Check the vendor's security advisory for the patched SimpleHelp versions and any workarounds. KEV listing makes this a fix-first item: patch it ahead of higher-CVSS issues nobody is exploiting.
Can I ask my own AI about CVE-2026-48558?
Yes. This page includes a free, ready-to-paste AI prompt containing CVE-2026-48558's key facts: severity, CVSS, EPSS, the KEV date, the CISA due date, and the required action. Copy it into Claude, ChatGPT, or Copilot; the data is refreshed twice a day (morning and afternoon US Central).
Scope and sources
- More exploited SimpleHelp CVEs
- Authoritative references
Every actively exploited CVE, searchable with due dates and CSV export: the exploited-CVE tracker. The newest additions: exploited this week.