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CVE-2026-76426: A vulnerability in the REST API of Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker t

27
Routine
MEDIUM 4.9UPGRADEUPGRADE

CVE-2026-76426 is a medium-severity flaw (CVSS 4.9) 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 REST API of Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to conduct SQL injection attacks against the monitoring database. This vulnerability is due to insufficient validation of specific parameters that are then concatenated into an SQL statement. An attacker could exploit this vulnerability by sending a crafted request that contains SQL statements in one of the affected parameters. A succes

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 chance0.5% (top 59%)
CISA exploited listNo
WeaknessCWE-89
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 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.
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.
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-2026-76426?

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-2026-76426 being exploited?

CVE-2026-76426 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-2026-76426 affect?

CVE-2026-76426 affects identity services engine, identity services engine passive identity connector. Severity is medium (CVSS 4.9). A vulnerability in the REST API of Cisco ISE and Cisco ISE-PIC could allow an authenticated, remote attacker to conduct SQL injection attacks against the monitoring database. This vulnerability is due to insufficient validation of specif

How urgent is CVE-2026-76426?

Priority 27/100. No elevated risk signals yet.

Software pages

Cisco vulnerabilities · Cisco ISE vulnerabilities

Related CVEs

References

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