CVE-2026-20234

criticalpriority · track · 40EPSS 0.004 · 34 %ileNLRUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
0.40% (34th) EPSS
CVSS 9.9 · critical
Is it mine?
505 products
Check your exposure
Who says so?
3 sources
fstec_bdu · cisco_csaf · ncsc_nl

EPSS · scored 2026-10-27

As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) engineering teams have conducted a comprehensive internal security review. This review resulted in a software hardening release that addresses multiple internally discovered vulnerabilities. The vulnerabilities tracked by CVE-2026-20234 are related to insufficiently protected credentials issues that are grouped under the Common Weakness Enumeration (CWE) Pillar CWE-522.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

02

cvss

Technical severity, 0–10. One row per scoring source.

9.9
010

base score 0–10 · higher = more severe · hover a vector to decode

v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hprimary · psirt@cisco.com USexploitability 3.1 · impact 6
v3.19.9criticalAV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · NCSC-NL NL
v3.19.9criticalCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:Hsecondary · Cisco PSIRT US
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-522USCWE-522USCWE-522US
05

affected products (505)

Products and version ranges known to be affected.

showing 20 of 505
06

advisories (2)

Vendor and ecosystem advisories describing this.

  • NCSC-2026-0382Kwetsbaarheden verholpen in Cisco Identity Services Engine (ISE)NL2026-09-17csaf · ncsc_nlNL

    Cisco heeft 21 kwetsbaarheden verholpen in Cisco Identity Services Engine (ISE) en Cisco ISE Passive Identity Connector (ISE-PIC).

  • cisco-sa-hardening-ise-XU5EwX5TCisco Identity Services Engine Hardening Release: September 20262026-09-16csaf · cisco_csafUS

    As part of Cisco's ongoing commitment to proactive security and product quality, the Cisco Identity Services Engine (ISE) and Cisco ISE Passive Identity Connector (ISE-PIC) engineering teams have conducted a comprehensive internal security review. This review resulted in software hardening releases that address multiple internally discovered vulnerabilities. These vulnerabilities were found during internal testing. One of them is known to be actively exploited. For more information, see Cisco Identity Services Engine Authentication Bypass Vulnerability ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ISE-ABP-VNSW7Tn5"]. To assist customers in patching and streamline the disclosure process, Cisco has grouped these issues by their underlying vulnerability class — Common Weakness Enumeration (CWE) — and assigned a single Common Vulnerabilities and Exposures identifier (CVE ID) to each CWE grouping. Cisco has released software updates that address these vulnerabilities. There are no workarounds that address these vulnerabilities. This advisory is part of a group of advisories. For a complete list of the advisories and links to them, see Cisco Advance Notification for Publication of September 16, 2026, Security Advisories ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-notice-jfxK98ZP"].

07

also known as (2)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

fstec_bducisco_csafncsc_nlNVDCVE.orgMITRE
published 2026-09-16modified 2026-09-28
09

references (1) nvd

External citations — patches, advisories, analysis.

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