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CVE-2026-76439

MEDIUM 5.3 ALL-YEARS

Published 2026-09-16 · Last modified 2026-09-18 · cisco · NVD: Analyzed

A vulnerability in the endpoint posture status reporting functionality of the guest portal web application of Cisco ISE could allow an unauthenticated, remote attacker to submit forged posture status events into the endpoint posture pipeline. This vulnerability is due to insufficient authentication on an internal interface that is exposed through the guest portal. An attacker could exploit this vulnerability by sending a crafted request to an affected system. A successful exploit could allow the attacker to manipulate the posture status on the affected system.

LIMITED SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.3%chance of exploitation in 30 days · 24th percentile

○ In CISA KEV○ Public exploit / PoC◆ SSVC: exploitation none, automatable yes

Impact if exploited

5.3CVSS 3.1 · MEDIUM · CNA

  • ConfidentialityNone
  • IntegrityLow
  • AvailabilityNone

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept & exploit code

No public exploit or proof-of-concept code is catalogued for this CVE (no ExploitDB, Nuclei, or CISA-KEV entry). It may still exist — search GitHub or check the references below.

Affected

Vendors Cisco

Products Cisco Identity Services Engine Software Cisco Ise Passive Identity Connector Identity Services Engine Identity Services Engine Passive Identity Connector

Weakness (CWE)

  • CWE-306: Missing Authentication for Critical Function

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Known Affected Software Configurations

VendorProductVersion range
CiscoIdentity Services Engine< 3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.3.0
CiscoIdentity Services Engine3.4.0
CiscoIdentity Services Engine3.4.0
CiscoIdentity Services Engine3.4.0
CiscoIdentity Services Engine3.4.0
CiscoIdentity Services Engine3.4.0
CiscoIdentity Services Engine3.4.0
CiscoIdentity Services Engine3.4.0
CiscoIdentity Services Engine3.5.0
CiscoIdentity Services Engine3.5.0
CiscoIdentity Services Engine3.5.0
CiscoIdentity Services Engine3.5.0
CiscoIdentity Services Engine Passive Identity Connector< 3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.3.0
CiscoIdentity Services Engine Passive Identity Connector3.4.0
CiscoIdentity Services Engine Passive Identity Connector3.4.0
CiscoIdentity Services Engine Passive Identity Connector3.4.0
CiscoIdentity Services Engine Passive Identity Connector3.4.0
CiscoIdentity Services Engine Passive Identity Connector3.4.0
CiscoIdentity Services Engine Passive Identity Connector3.4.0
CiscoIdentity Services Engine Passive Identity Connector3.4.0

All CVSS metrics

  • MEDIUM 5.3 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
  • MEDIUM 5.3 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

References

Advisories

Sources: NVD · CVE.org · EPSS