PatchTheCVECVE-2026-76439: A vulnerability in the endpoint posture status reporting functionality of the guest portal web application of
CVE-2026-76439 is a medium-severity flaw (CVSS 5.3) affecting identity services engine, identity services engine passive identity connector. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
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
Why this priority
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 67%) |
| CISA exploited list | No |
| Weakness | CWE-306 |
| Published | 2026-09-16 |
| Last modified | 2026-09-28 |
Last updated 2026-09-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Advisories and coverage
Official advisories
- Cisco Security Advisories: Cisco Identity Services Engine Authentication Bypass Vulnerabilities 2026-09-24
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2026-76439?
identity services engine: upgrade to 3.3.0; identity services engine passive identity connector: upgrade to 3.3.0. Exact commands for each OS are on this page.
Is CVE-2026-76439 being exploited?
CVE-2026-76439 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2026-76439 affect?
CVE-2026-76439 affects identity services engine, identity services engine passive identity connector. Severity is medium (CVSS 5.3). 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 pipelin
How urgent is CVE-2026-76439?
Priority 32/100. Remotely exploitable, no login, no user action
Software pages
Cisco vulnerabilities · Cisco ISE vulnerabilities
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