Unrated

Information Disclosure in Cisco ISE and ISE-PIC

IdentifiersCVE-2026-20190CWE-863

CVE-2026-20190 is a high-severity information disclosure vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC). The flaw is caused by improper authorization checks when a resource is accessed, allowing an unauthenticated remote attacker to send crafted traffic or requests to an affected device and retrieve sensitive information that should not be exposed. Cisco indicates that disclosed data may include hashed credentials, creating downstream risk beyond the initial disclosure.

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ANALYST BRIEF

Impact, mitigation & remediation

What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.

Impact

What an attacker gets, and what they’ve been doing with it.

Successful exploitation allows an unauthenticated remote attacker to view sensitive information stored on the affected Cisco ISE or ISE-PIC device. Exposed data can include hashed credentials, which may be used to support subsequent attacks such as credential cracking, unauthorized access attempts, privilege escalation through credential reuse, or broader lateral movement within the environment.

Mitigation

If you can’t patch tonight, do this now.

No workaround is available according to Cisco. Where immediate patching is not possible, reduce exposure by restricting access to Cisco ISE and ISE-PIC management and reachable interfaces to trusted networks only, closely monitor logs for suspicious crafted HTTP or application requests, and review authentication-related activity for signs of follow-on abuse involving exposed credential material. These are defensive risk-reduction measures only; patching is the only effective mitigation described in the content.

Remediation

Patch, then assume compromise.

Apply Cisco’s fixed software updates. The provided content indicates fixes are available in Cisco ISE/ISE-PIC 3.3 Patch 11 and 3.4 Patch 6. For 3.5, the content indicates a fix is planned for Patch 4 in August 2026, and one source also notes a 3.5 hotfix was made available ahead of that release. Organizations running older unsupported versions should migrate to a supported fixed release.

PUBLIC EXPLOITS

Exploits

No public exploits tracked yet. Mallory keeps watching.

VALID 0 / 0 TOTALView more in app

No public exploit code observed for this vulnerability.

EXPOSURE SURFACE

Affected products & vendors

Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.

VendorProductType

Cisco SystemsIdentity Services Engineapplication

Cisco SystemsIdentity Services Engine Passive Identity Connectorapplication

Cisco SystemsIseapplication

Cisco SystemsIse-Picapplication

Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.

ACTIVITY FEED

Recent activity

8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.

8 SOURCESView more in app

cyber security newsNews

Jun 18, 2026

Cisco ISE Vulnerability Allow Attacker to Execute Malicious Code Remotely

A critical information disclosure vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) that allows an unauthenticated remote attacker to access sensitive information, including hashed credentials.

security weekNews

Jun 18, 2026

Critical Command Execution Vulnerability Patched in Cisco ISE - SecurityWeek

A high-severity information disclosure vulnerability in Cisco ISE and ISE-PIC that could allow unauthenticated attackers to access sensitive data, including hashed credentials.

security online infoNews

Jun 17, 2026

Cisco ISE Vulnerabilities: Critical RCE & Data Risks

A high-severity information disclosure vulnerability in Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) that allows an unauthenticated remote attacker to access sensitive information, including hashed credentials.

What this page doesn’t show

The version that knows your environment.

This page is what’s public. Mallory adds the parts that aren’t: which of your assets are affected, which adversaries are exploiting it right now, which detections to deploy, and what to do tonight.

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Exposure mapping

Query your assets running an affected version, and investigate the blast radius.

Threat actor evidence

Every observed campaign linking this CVE to a named adversary.

Associated malware

Malware families riding this exploit, with evidence and IOCs.

Detection signatures

YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.

Vendor-by-vendor mapping

Cross-references every affected SKU, including bundled OEM variants.

Social activity4

Community discussion across Reddit, Mastodon, and other social sources.

EXTERNAL REFERENCES

MITRE CVE

cve.org · CVE-2026-20190

NVD

nvd.nist.gov/vuln/detail/CVE-2026-20190

MITRE CWE · CWE-863

cwe.mitre.org