Medium

CVE-2026-76451 — A vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity…

A vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) could allow an authenticated, remote attacker to conduct an SQL or HQL injection attack on an affected device. This vulnerability is due to insufficient validation of user-supplied input to the affected APIs before it is used to build database queries. An attacker could exploit this vulnerability by sending a crafted request to an affected device. A successful exploit could allow the attacker to execute arbitrary SQL or HQL queries against the underlying database, which could allow the attacker to view or modify data that they are not authorized to access. To exploit this vulnerability, the attacker must have valid administrative credentials.

Published Sep 16, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database · CNA: psirt@cisco.com

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

Cisco

Identity Services Engine and 1 more

CVSS base

4.9

Medium · 1 source(s)

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Cisco Identity Services Engine, Cisco Identity Services Engine Passive Identity Connector).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Cisco	Identity Services Engine	version 3.3.0-patch1version 3.5.0-patch3version 3.5.0-patch2version 3.5.0-patch1version 3.5.0version 3.4.0-patch6version 3.4.0-patch5version 3.4.0-patch4 and 15 more version 3.4.0-patch3version 3.4.0-patch2version 3.4.0-patch1version 3.4.0version 3.3.0-patch8version 3.3.0-patch9≥ 3.1.0 and < 3.3.0version 3.3.0-patch10version 3.3.0-patch11version 3.3.0-patch2version 3.3.0-patch3version 3.3.0-patch4version 3.3.0-patch5version 3.3.0-patch6version 3.3.0-patch7	Vulnerable	NIST National Vulnerability Database
Cisco	Identity Services Engine Passive Identity Connector	version 3.4.0-patch6version 3.4.0-patch5version 3.4.0-patch4version 3.4.0-patch3version 3.4.0-patch2version 3.4.0-patch1version 3.4.0version 3.3.0-patch9 and 11 more version 3.3.0-patch8version 3.3.0-patch7version 3.3.0-patch6version 3.3.0-patch5version 3.3.0-patch4version 3.3.0-patch3version 3.3.0-patch2version 3.3.0-patch11version 3.3.0-patch10version 3.3.0-patch1≥ 3.1.0 and < 3.3.0	Vulnerable	NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

High

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
4.9	CVSS 3.1	Medium	1.2	3.6	psirt@cisco.com via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N (score shown at the top: psirt@cisco.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-564

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).

web/proxy/WAF logsnetwork IDS/IPS

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
CVSS changed · 4.9
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 16, 2026 · psirt@cisco.com

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

1 on the record

sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-multisql-i
Vendor Advisory, NIST National Vulnerability Database

Elsewhere on this site

Cisco
every CVE for this vendor

CWE-564
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-76450 A vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity… 29d
Critical CVE-2026-76460 Cisco Identity Services Engine Incorrect Use of Privileged APIs Vulnerability KEV 29d
Medium CVE-2026-76449 SQL Injection in Cisco Identity Services Engine 29d
Medium CVE-2026-76448 SQL Injection in Cisco Identity Services Engine 29d
Medium CVE-2026-76446 XML External Entity (XXE) in Cisco Identity Services Engine 29d
Medium CVE-2026-76447 Missing Authentication for Critical Function in Cisco Identity Services Engine Passive Identity Connector 29d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-76451 is "A vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity…", rated Medium. It affects Identity Services Engine (Cisco); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.9 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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