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CVE-2026-20241VulnerabilityPublished

Cisco Identity Services Engine Authorization Bypass Vulnerability

Affects CiscoSource GCVE Database

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Authoritative record:CVE-2026-20241· Medium 5.3

Not known to be exploited · CVSS 5.3 Medium.

Data as of 4 Nov 2026, 20:30 UTC

CVSS 3.1 base score
5.3Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (cisco)CVSS 3.15.3
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 4 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 4 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
CiscoCisco Identity Services Engine SoftwareAffected
  • 3.1.0 – 3.5.0
5 affected builds
Fixed in–
CiscoCisco ISE Passive Identity ConnectorAffected
  • 3.1.0 – 3.5.0
5 affected builds
Fixed in–

AI-suggested

The vendor advisory references fixed software versions; therefore, applying the official patches or updates from Cisco for affected versions 3.1 and 3.1.0 is recommended.

Description

A vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE-PIC versions 3.1 and 3.1.0 allows an authorization bypass regardless of device configuration. This issue was publicly disclosed on November 4, 2026. Specific fixed software versions are referenced in the vendor advisory but not detailed here.

References

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