Ivanti Connect Secure: attackers can get in without a password
OFFICIAL NAME: Ivanti Connect Secure Authentication Bypass by Spoofing Vulnerability
WHAT IT IS · VPN, FIREWALL OR GATEWAYIt sits at the edge of your network and faces the internet, so attackers can reach it directly.
DO THIS FIRSTIf you have it, patch it today. If you cannot, block access to it from the internet until you can. Not sure if you use it? Send this page to your IT provider or security lead and ask.
TECHNICAL SUMMARY Ivanti Connect Secure contains an authentication bypass by spoofing vulnerability that allows a remote unauthenticated attacker to execute arbitrary commands.
WHY THIS VERDICT Attacks are confirmed. The vulnerability is 28 days old, so many systems are likely still unpatched. Ready-made attack tools are public. It affects a product that faces the internet or gives remote access. The exploit prediction score is 89%.
WHY IT RANKS HERE Exploitation is confirmed by an authoritative source. The product faces the internet or gives remote access. Ready-made attack tools are public.
- HIGHEST CONFIRMED RUNG
- EXPLOITED
- CISA KEV
- LISTED
- EXPLOIT CODE
- READY TO USE
How far has it climbed?
01 TALK
■ CONFIRMEDNEWEST EVIDENCE · 4 INDEPENDENT SOURCESCVE-2026-104935 discussed publicly (CIRCL sighting). CVE-2026-104935 discussed publicly (CIRCL sighting).
- SRC: CIRCL Vulnerability-Lookup sightings: CVE-2026-104935 discussed publicly (CIRCL sighting) · NOV 3
- SRC: Security Affairs: U.S. CISA adds Ivanti Connect Secure flaws to its Known Exploited Vulnerabilities catalog · OCT 31
- SRC: Dark Reading: Ivanti ICS Zero-Day Attacks Highlight Vendor Patching Hurdles · OCT 14
02 EXPOSED
□ NOT TRACKED YETNO SOURCE FOR THIS STEP YETWe have no source that counts exposed systems yet. Internet scan data needs a partnership we do not have. No evidence here does not mean nothing is exposed.
03 TRIED
■ CONFIRMEDNEWEST EVIDENCE · 3 INDEPENDENT SOURCESAttack attempts on CVE-2026-104935 seen by honeypots (Shadowserver via CIRCL).
04 EXPLOITED
■ CONFIRMEDNEWEST EVIDENCE · 3 INDEPENDENT SOURCESExploitation of CVE-2026-104935 reported (CIRCL sighting). CISA Vulnrichment marks CVE-2026-104935 as actively exploited.
- SRC: CIRCL Vulnerability-Lookup sightings: Exploitation of CVE-2026-104935 reported (CIRCL sighting) · NOV 2
- SRC: CVE List V5 and CISA Vulnrichment: CISA Vulnrichment marks CVE-2026-104935 as actively exploited · OCT 13
- SRC: CISA Known Exploited Vulnerabilities: Ivanti Connect Secure Authentication Bypass by Spoofing Vulnerability · OCT 12
05 DAMAGE
□ NOT TRACKED YETNO SOURCE FOR THIS STEP YETBreach notices and filings rarely name the flaw that was used, so we cannot link them to this event yet. No evidence here does not mean no harm.
When each thing happened
- DISCLOSED
- EXPLOIT CODE PUBLIC
- FIRST ATTACK REPORT
- CISA KEV LISTING
- US FEDERAL DEADLINE
THE FIX
CISA's instruction: apply the vendor's fix, or stop using the product if no fix exists. The deadline CISA set for US federal agencies, Oct 16, 2026, has passed. It is a US government deadline; use it as a guide.
Questions to ask this week
- Do we run Ivanti Connect Secure? If yes, is it patched or cut off from the internet?
- Who owns fixing it, and by what date?
- Have we checked for signs of attack since the first report, not just since the patch?
How it unfolded
- Attack activity. OCT 12, 2026Ivanti Connect Secure Authentication Bypass by Spoofing Vulnerability
- Attack activity. OCT 13, 2026CISA Vulnrichment marks CVE-2026-104935 as actively exploited
- OCT 13, 20265 public GitHub repositories claim a proof of concept for CVE-2026-104935
- OCT 13, 2026Vulnerability CVE-2026-104935 confirmed by a researcher (CIRCL sighting)
- OCT 14, 2026Ivanti ICS Zero-Day Attacks Highlight Vendor Patching Hurdles
- OCT 16, 2026Ivanti security advisory (AV26-1035) - Update 1
- Attack activity. OCT 21, 2026Attack attempts on CVE-2026-104935 seen by honeypots (Shadowserver via CIRCL)
- OCT 22, 2026Public proof of concept for CVE-2026-104935 (CIRCL sighting) (4 reports, latest OCT 24)
- OCT 24, 2026CVE-2026-104935 discussed publicly (CIRCL sighting) (29 reports, latest NOV 3)
- OCT 31, 2026U.S. CISA adds Ivanti Connect Secure flaws to its Known Exploited Vulnerabilities catalog
- Attack activity. NOV 2, 2026Exploitation of CVE-2026-104935 reported (CIRCL sighting)
SOURCES
- [1] nuclei-templates: Nuclei scan template: Ivanti Connect Secure <= 22.8R2.4 - Authentication Bypass via X-DSCGI-PATH Header, OCT 24
- [2] CIRCL Vulnerability-Lookup sightings: CVE-2026-104935 discussed publicly (CIRCL sighting), NOV 3
- [3] CIRCL Vulnerability-Lookup sightings: Exploitation of CVE-2026-104935 reported (CIRCL sighting), NOV 2
- [4] Security Affairs: U.S. CISA adds Ivanti Connect Secure flaws to its Known Exploited Vulnerabilities catalog, OCT 31
- [5] CIRCL Vulnerability-Lookup sightings: Public proof of concept for CVE-2026-104935 (CIRCL sighting), OCT 24
- [6] Canadian Centre for Cyber Security: Ivanti security advisory (AV26-1035) - Update 1, OCT 16
- [7] Dark Reading: Ivanti ICS Zero-Day Attacks Highlight Vendor Patching Hurdles, OCT 14
- [8] PoC-in-GitHub: 5 public GitHub repositories claim a proof of concept for CVE-2026-104935, OCT 13
- [9] CVE List V5 and CISA Vulnrichment: CISA Vulnrichment marks CVE-2026-104935 as actively exploited, OCT 13
- [10] CISA Known Exploited Vulnerabilities: Ivanti Connect Secure Authentication Bypass by Spoofing Vulnerability, OCT 12
- [11] CIRCL Vulnerability-Lookup sightings: 33 more reports