---
title: "CVE-2026-104935: Ivanti Connect Secure Authentication Bypass by Spoofing Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-104935/
description: "CVE-2026-104935 (Ivanti Connect Secure): Exploited in the wild (CISA KEV). Authentication bypass by spoofing in ICS before version 25.1.3.0 allows a remote…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-10-13
date_modified: 2026-10-21
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-104935"
kev: true
cvss: 8.6
epss: 0.25982
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-104935: Ivanti Connect Secure Authentication Bypass by Spoofing Vulnerability

**Signal:** Exploited: patch now if you run it. CISA has confirmed exploitation in the wild. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Yes, if you run Ivanti Connect Secure. CISA added this CVE to its Known Exploited Vulnerabilities catalog on 2026-10-13, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-10-16 ; treat that as the outer limit, not the target.
- EPSS 26.0% , percentile 98: FIRST’s model estimates a 26.0% chance of exploitation activity in the next 30 days, higher than 98% of all scored CVEs (very high). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Editorial verdict: Act now. Ivanti Connect Secure CVE-2026-104935: Exploited Zero-Day — Upgrade Connect Secure today and investigate with memory and network forensics, because the Integrity Checker missed this compromise and part of the attack chain still has no fix.

## What it is

Authentication bypass by spoofing in ICS before version 25.1.3.0 allows a remote unauthenticated attacker to execute arbitrary commands. This does not impact ICS version 22.7R2.14 or prior.

## Affected products (CVE record)

- Ivanti Connect Secure: see advisory

## Severity

- ivanti CVSS 3.1: 8.6 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L`

## Exploitation

- CISA KEV: added 2026-10-13; federal due date 2026-10-16. Known ransomware use: Unknown.
- CISA 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.
- CISA SSVC assessment: exploitation active , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 25.98% probability of exploitation activity in the next 30 days; percentile 98.

## Sources

- [CVE.org record CVE-2026-104935](https://www.cve.org/CVERecord?id=CVE-2026-104935)
- [NVD entry CVE-2026-104935](https://nvd.nist.gov/vuln/detail/CVE-2026-104935)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-104935)
- [hub.ivanti.com](https://hub.ivanti.com/s/article/Security-Advisory-Ivanti-Connect-Secure-CVE-2026-104935)

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Source page: https://erroneo.us/security/cve/CVE-2026-104935/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt