CVE-2026-111357
CVE-2026-111357 is a security flaw in Ivanti Connect Secure, a VPN companies use to let staff in from outside. Someone who already has a foothold can use Ivanti Connect Secure to take full control of the machine. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 30 Oct 2026.[1]
Ivanti Connect Secure is business software or equipment. Most families won’t have it, but attackers break into it to get inside companies, and from there to what those companies hold about their customers, patients and staff. Ivanti has published a fix or advice.
Description
CISA calls it a missing authentication for critical function in Ivanti Connect Secure. In its words: “Ivanti Connect Secure contains a missing authentication for critical function vulnerability that could allow a local authenticated attacker to escalate their privileges. This vulnerability can be chained with CVE-2026-104935 and CVE-2026-118527.”[1]
The underlying weakness is missing authentication (CWE-306), missing authorization (CWE-862), CWE-345, in MITRE’s list of common software weaknesses.[2]
It scores 7.0 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by the organisation that published the CVE using CVSS 3.1.[2]
Affected versions
NVD’s record doesn’t list version ranges for it; Ivanti’s advisory has them[3]. CISA names the product as Ivanti Connect Secure.
Most families won’t have Ivanti Connect Secure; it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 30 Oct 2026, 15 days after it was made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 2 Nov 2026 to fix it.[1]
FIRST’s Exploit Prediction Scoring System, which estimates how likely a flaw is to be used in attacks in the next 30 days from what it sees across the internet, puts it at under 1%. That’s in the top 55% of the flaws it scores.[4]
CISA assesses it as not automatable: each attack takes some work.
CISA doesn’t say who was attacked, or how.
Fix
Ivanti has published a fix or advice.[3] CISA’s 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).”[1]
- Check whether you use it.Ivanti Connect Secure is business software or equipment, so most families won’t have it. If you run a business, or work from home on company equipment, ask whoever looks after your IT.
- Send this page to your IT person.Ask them to confirm it’s fixed, or not in use. CISA gave US government agencies until 2 Nov 2026 to fix it.
- If it can’t be fixed, take it offline.CISA’s advice when there’s no fix is to stop using the product, or take it off the internet, until there is one.
You can’t fix someone else’s server, but you can watch for what follows a break-in like this: a breach notice, a password reset you didn’t ask for, or a scam message that knows things it shouldn’t. HARD watches for those for you and your family.
Timeline
| Date | Event |
|---|---|
| The flaw is made public in the National Vulnerability Database, with a severity score of 7.0.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at under 1%.[4] | |
| CISA’s deadline for US government agencies to fix it.[1] |
See also
Other Ivanti Connect Secure flaws
- CVE-2026-118527: generation of predictable numbers or identifiers ·
- CVE-2026-104935: authentication bypass by spoofing ·
Other Ivanti flaws
- CVE-2026-10520, Ivanti Sentry: OS command injection ·
- CVE-2026-6973, Ivanti Endpoint Manager Mobile (EPMM): improper input validation ·
- CVE-2026-1340, Ivanti Endpoint Manager Mobile (EPMM): code injection ·
- CVE-2026-1603, Ivanti Endpoint Manager (EPM): authentication bypass ·
- CVE-2026-1281, Ivanti Endpoint Manager Mobile (EPMM): code injection ·
Other missing authentication flaws
- CVE-2026-67277, MikroTik RouterOS: missing authentication for critical function ·
- CVE-2026-81578, PaperCut NG/MF: missing authentication for critical function ·
- CVE-2026-72529, TrueConf Server: missing authentication for critical function ·
- CVE-2026-56164, Microsoft SharePoint Server: missing authentication for critical function ·
- CVE-2026-20253, Splunk Enterprise: missing authentication for critical function ·
Added the same day
- CVE-2026-118527, Ivanti Connect Secure: generation of predictable numbers or identifiers ·
Every Ivanti flaw on CISA’s list · Everything added in October 2026
References
- ^ Cybersecurity and Infrastructure Security Agency. “Ivanti Connect Secure Missing Authentication for Critical Function Vulnerability”. Known Exploited Vulnerabilities Catalog, added 30 Oct 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-111357 Detail”. National Vulnerability Database, published 15 Oct 2026.
- ^ Ivanti. Advisories and fixes: hub.ivanti.com, hub.ivanti.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.005, percentile 45.0, 31 Oct 2026.
- CVE Program. “CVE-2026-111357”. The official CVE record.
This article is built from CISA’s catalog (version 2026.10.30), NVD’s record and FIRST’s scores, kept in HARD’s database and checked every morning. The plain English is HARD’s.