CVE-2026-118527: Ivanti Connect Secure

Should you act?

Exploited: patch now if you run it

CISA has confirmed exploitation in the wild. This signal is computed from CISA KEV, EPSS and CVSS data; it is not an editorial verdict.

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.
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

CISA’s summary

Ivanti Connect Secure contains a generation of predictable numbers or identifiers vulnerability that allows a remote authenticated attacker to upload files with attacker-controlled content to a known location on disk. This vulnerability can be chained with CVE-2026-104935 and CVE-2026-111357.

Weakness type: CWE-340.

Product: Ivanti Connect Secure · Published: 2026-10-30

Affected and fixed versions

The CVE record does not list structured version data. Use the vendor advisory in the sources below for exact affected and fixed versions.

Severity scores

No CVSS score has been published for this CVE yet.

CVSS measures how bad a flaw is if exploited, not how likely exploitation is. Read it next to the exploitation data below.

Exploitation and urgency

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.
FIRST EPSS (model of 2026-11-04): 0.82% probability of exploitation activity in the next 30 days; percentile 57.

Timeline

2026-10-13 — erroneo.us brief: Ivanti Connect Secure CVE-2026-104935 Chain: Patch Again
2026-10-30 — Added to CISA’s Known Exploited Vulnerabilities catalog
2026-11-13 — CISA remediation deadline for US federal agencies

Sources and references

Original sources first. Version and fix details should always be confirmed against the vendor or project advisory.