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VulnerabilityPublished

CVE-2026-76423: CWE-290

Source GCVE Database

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Authoritative record:CVE-2026-76423· Critical 10.0

Not known to be exploited · CVSS 10.0 Critical.

Data as of 31 Oct 2026, 20:20 UTC

CVSS 3.1 base score
10.0Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.5% chance of exploitation in 30 days – higher than 47% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 16 Sep 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 31 Oct 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

Until a fix is available, restricting access to the REST API port and implementing network-level controls to limit exposure may reduce risk.

Description

A critical vulnerability exists in the REST API of Cisco ISE and Cisco ISE-PIC that allows unauthenticated remote attackers to gain administrative access. The flaw is due to insufficient authorization checks on the REST API web service, enabling attackers to send crafted HTTP requests to the exposed API port. Successful exploitation could lead to reading and modifying configuration and identity data with administrative privileges.

References

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