CVE-2026-1603
CVE-2026-1603 is a security flaw in Ivanti Endpoint Manager (EPM), Ivanti’s IT management and remote-access software. Attackers can get into Ivanti Endpoint Manager (EPM) without a valid password. The US Cybersecurity and Infrastructure Security Agency (CISA) added it to its catalog of flaws known to be used in attacks on 9 Mar 2026.[1]
Ivanti Endpoint Manager (EPM) 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 in Ivanti Endpoint Manager (EPM). In its words: “Ivanti Endpoint Manager (EPM) contains an authentication bypass using an alternate path or channel vulnerability that could allow a remote unauthenticated attacker to leak specific stored credential data.”[1]
The underlying weakness is authentication bypass (CWE-288), in MITRE’s list of common software weaknesses.[2]
It scores 7.5 out of 10 on the Common Vulnerability Scoring System, which rates it high, scored by NVD 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 Endpoint Manager (EPM).
Most families won’t have Ivanti Endpoint Manager (EPM); it’s for whoever looks after IT at work.
Exploitation
CISA added it to its catalog of known exploited vulnerabilities on 9 Mar 2026, 27 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 23 Mar 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 88%. 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 per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.”[1]
- Check whether you use it.Ivanti Endpoint Manager (EPM) 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 23 Mar 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 7.5.[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 88%.[4] |
See also
Other Ivanti Endpoint Manager (EPM) flaws
- CVE-2024-13161: absolute path traversal ·
- CVE-2024-13160: absolute path traversal ·
- CVE-2024-13159: absolute path traversal ·
- CVE-2024-29824: SQL injection ·
Other Ivanti flaws
- CVE-2026-118527, Ivanti Connect Secure: generation of predictable numbers or identifiers ·
- CVE-2026-111357, Ivanti Connect Secure: missing authentication for critical function ·
- CVE-2026-104935, Ivanti Connect Secure: authentication bypass by spoofing ·
- CVE-2026-10520, Ivanti Sentry: OS command injection ·
- CVE-2026-6973, Ivanti Endpoint Manager Mobile (EPMM): improper input validation ·
Other authentication bypass flaws
- CVE-2026-20079, Cisco Secure Firewall Management Center (FMC) and Security Cloud Control (SCC) Firewall Management: firewall management center authentication bypass using an alternate path or channel ·
- CVE-2026-19490, Citrix NetScaler: authentication bypass using an alternate path or channel ·
- CVE-2026-18556, N-able N-central: authentication bypass using an alternate path or channel ·
- CVE-2026-18577, N-able N-central: authentication bypass using an alternate path or channel ·
- CVE-2026-24858, Fortinet products: authentication bypass using an alternate path or channel ·
Added the same day
- CVE-2025-26399, SolarWinds Web Help Desk: deserialization of untrusted data ·
- CVE-2021-22054, Omnissa Workspace One UEM: workspace ONE server-side request forgery ·
Every Ivanti flaw on CISA’s list · Everything added in March 2026
References
- ^ Cybersecurity and Infrastructure Security Agency. “Ivanti Endpoint Manager (EPM) Authentication Bypass Vulnerability”. Known Exploited Vulnerabilities Catalog, added 9 Mar 2026.
- ^ National Institute of Standards and Technology. “CVE-2026-1603 Detail”. National Vulnerability Database, published 10 Feb 2026.
- ^ Ivanti. Advisories and fixes: hub.ivanti.com.
- ^ FIRST. “Exploit Prediction Scoring System”. EPSS 0.883, percentile 99.8, 31 Oct 2026.
- CVE Program. “CVE-2026-1603”. 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.