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CVE-2026-76451: A vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) cou

26
Routine
MEDIUM 4.9UPGRADEUPGRADE

CVE-2026-76451 is a medium-severity flaw (CVSS 4.9) affecting identity services engine passive identity connector, identity services engine. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 affecte

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score4.9 (Medium)
Attack vectorNetwork (remote)
Attack complexityLow
Privileges neededHigh
User interactionNone
EPSS exploit chance0.4% (top 63%)
CISA exploited listNo
WeaknessCWE-564
Published2026-09-16
Last modified2026-09-28
Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

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Last updated 2026-09-28 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

cisco identity services engine passive identity connector UPGRADE
Affected: >= 3.1.0 and < 3.3.0 · 3.3.0 patch1 · 3.3.0 patch10 · 3.3.0 patch11 · 3.3.0 patch2 · 3.3.0 patch3 · 3.3.0 patch4 · 3.3.0 patch5
Fixed in: 3.3.0
Safe to downgrade to: a release before 3.1.0
1. Check installed version
apt-cache policy identity-services-engine-passive-identity-connector || rpm -q identity-services-engine-passive-identity-connector || identity-services-engine-passive-identity-connector --version
2. UPGRADE to 3.3.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade identity-services-engine-passive-identity-connector
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade identity-services-engine-passive-identity-connector
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 3.1.0 (Debian / Ubuntu)
apt-cache madison identity-services-engine-passive-identity-connector sudo apt install identity-services-engine-passive-identity-connector=<VERSION_BEFORE_3.1.0> sudo apt-mark hold identity-services-engine-passive-identity-connector
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list identity-services-engine-passive-identity-connector sudo dnf downgrade identity-services-engine-passive-identity-connector-<VERSION_BEFORE_3.1.0> sudo dnf versionlock add identity-services-engine-passive-identity-connector
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
cisco identity services engine UPGRADE
Affected: >= 3.1.0 and < 3.3.0 · 3.3.0 patch1 · 3.3.0 patch10 · 3.3.0 patch11 · 3.3.0 patch2 · 3.3.0 patch3 · 3.3.0 patch4 · 3.3.0 patch5
Fixed in: 3.3.0
Safe to downgrade to: a release before 3.1.0
1. Check installed version
apt-cache policy identity-services-engine || rpm -q identity-services-engine || identity-services-engine --version
2. UPGRADE to 3.3.0 (Debian / Ubuntu)
sudo apt update && sudo apt install --only-upgrade identity-services-engine
2. UPGRADE (RHEL / Amazon Linux / Fedora)
sudo dnf upgrade identity-services-engine
Note
Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.
3. If no update is available yet, DOWNGRADE to a release before 3.1.0 (Debian / Ubuntu)
apt-cache madison identity-services-engine sudo apt install identity-services-engine=<VERSION_BEFORE_3.1.0> sudo apt-mark hold identity-services-engine
3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)
dnf --showduplicates list identity-services-engine sudo dnf downgrade identity-services-engine-<VERSION_BEFORE_3.1.0> sudo dnf versionlock add identity-services-engine
Downgrade risk
Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.
After downgrade
Restart the service, and keep the package held until a fixed release ships.
Verify at the official source NVD · CVE Program · Report a problem with this page
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-2026-76451?

identity services engine passive identity connector: upgrade to 3.3.0; identity services engine: upgrade to 3.3.0. Exact commands for each OS are on this page.

Is CVE-2026-76451 being exploited?

CVE-2026-76451 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-2026-76451 affect?

CVE-2026-76451 affects identity services engine passive identity connector, identity services engine. Severity is medium (CVSS 4.9). 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

How urgent is CVE-2026-76451?

Priority 26/100. No elevated risk signals yet.

Software pages

Cisco vulnerabilities · Cisco ISE vulnerabilities

Related CVEs

References

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