---
title: "CVE-2026-118527: Ivanti Connect Secure Generation of Predictable Numbers or Identifiers Vulnerability"
url: https://erroneo.us/security/cve/CVE-2026-118527/
description: "CVE-2026-118527 (Ivanti Connect Secure): Exploited in the wild (CISA KEV). Use of predictable filenames in Ivanti Connect Secure before versions 25.1.1.3…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-11-03
date_modified: 2026-11-03
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-118527"
kev: true
cvss: 4.3
epss: 0.00822
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-118527: Ivanti Connect Secure Generation of Predictable Numbers or Identifiers 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 2026-10-30, which means there is reliable evidence of exploitation in the wild. US federal agencies must remediate by 2026-11-13 ; treat that as the outer limit, not the target.
- EPSS 0.8% , percentile 57: FIRST’s model estimates a 0.8% chance of exploitation activity in the next 30 days, higher than 57% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Needs an account (low (any account)). Exposure depends on who can log in.
- Editorial verdict: Act now. Ivanti Connect Secure CVE-2026-104935 Chain: Patch Again — Upgrade Connect Secure again, even if you patched on October 13, because the root escalation fixed on October 29 is exploited and in KEV; then investigate with memory and network forensics, since the Integrity Checker missed this chain.

## What it is

Use of predictable filenames in Ivanti Connect Secure before versions 25.1.1.3 and 22.8R2.6 allows a remote authenticated attacker to upload files with attacker-controlled content to a known location on disk.

## Affected products (CVE record)

- Ivanti Connect Secure: see advisory

## Severity

- ivanti CVSS 3.1: 4.3 `CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N`

## Exploitation

- CISA KEV: added 2026-10-30; federal due date 2026-11-13. 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 no , technical impact partial .
- FIRST EPSS (model of 2026-11-05): 0.82% probability of exploitation activity in the next 30 days; percentile 57.

## Sources

- [Listed in CISA KEV notes (hub.ivanti.com)](https://hub.ivanti.com/s/article/Security-Advisory-Ivanti-Connect-Secure-CVE-2026-104935?language=en_US)
- [CVE.org record CVE-2026-118527](https://www.cve.org/CVERecord?id=CVE-2026-118527)
- [NVD entry CVE-2026-118527](https://nvd.nist.gov/vuln/detail/CVE-2026-118527)
- [CISA Known Exploited Vulnerabilities catalog entry](https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-118527)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-prioritizing-security-updates-based-risk)
- [Listed in CISA KEV notes (cisa.gov)](https://www.cisa.gov/news-events/directives/bod-26-04-implementation-guidance-prioritizing-security-updates-based-risk)

---
Source page: https://erroneo.us/security/cve/CVE-2026-118527/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt