CVE-2026-104935
CVE-2026-104935 is a security flaw in Ivanti Connect Secure, a VPN companies use to let staff in from outside. Attackers can run commands on Ivanti Connect Secure from anywhere, without logging in. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 13 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 an authentication bypass by spoofing in Ivanti Connect Secure. In its words: “Ivanti Connect Secure contains an authentication bypass by spoofing vulnerability that allows a remote unauthenticated attacker to execute arbitrary commands.”[1]
The underlying weakness is authentication bypass by spoofing (CWE-290), in MITRE’s list of common software weaknesses.[2]
It scores 8.6 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 13 Oct 2026, within a day of it being made public. CISA lists a flaw only when it has reliable evidence of it being exploited, and gave US federal agencies until 16 Oct 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 87%. That’s in the top 1% of the flaws it scores.[4]
CISA assesses it as automatable: attackers can run it against many targets at once.
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 16 Oct 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 8.6.[2] | |
| CISA adds it to its catalog of flaws known to be used in attacks.[1] | |
| CISA’s deadline for US government agencies to fix it.[1] | |
| FIRST puts the odds of it being used in attacks in the next 30 days at 87%.[4] |
See also
Other Ivanti Connect Secure flaws
- CVE-2026-118527: generation of predictable numbers or identifiers ·
- CVE-2026-111357: missing authentication for critical function ·
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 authentication bypass by spoofing flaws
- CVE-2026-102764, BeyondTrust Remote Support: authentication bypass by spoofing ·
- CVE-2023-50224, TP-Link TL-WR841N: authentication bypass by spoofing ·
- CVE-2024-54085, AMI MegaRAC SPx: authentication bypass by spoofing ·
- CVE-2024-4358, Progress Telerik Report Server: authentication bypass by spoofing ·
- CVE-2022-24112, Apache APISIX: authentication bypass ·
Added the same day
- CVE-2026-96951, Microsoft Windows: command injection ·
Every Ivanti flaw on CISA’s list · Everything added in October 2026
References
- ^ Cybersecurity and Infrastructure Security Agency. “Ivanti Connect Secure Authentication Bypass by Spoofing Vulnerability”. Known Exploited Vulnerabilities Catalog, added 13 Oct 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-104935 Detail”. National Vulnerability Database, published 13 Oct 2026.
- ^ Ivanti. Advisories and fixes: hub.ivanti.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.868, percentile 99.7, 31 Oct 2026.
- CVE Program. “CVE-2026-104935”. 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.