How severe is CVE-2026-20223?

CVE-2026-20223 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-20223 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20223?

CVE-2026-20223 affects Cisco Secure Workload. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-20223?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-20223 have an EU (EUVD) identifier?

Yes. CVE-2026-20223 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31131.

When was CVE-2026-20223 published?

CVE-2026-20223 was published on 2026-05-20 and last updated on 2026-06-30.

CVE-2026-20223

CVE-2026-20223 is a critical-severity vulnerability in Cisco Secure Workload with a CVSS 3.x base score of 10.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-306.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 1% (53rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-31131
Weakness: CWE-306
Affected product: Cisco Secure Workload
Published: 2026-05-20
Last modified: 2026-06-30

Description

A vulnerability in the access validation of internal REST APIs of Cisco Secure Workload could allow an unauthenticated, remote attacker to access site resources with the privileges of the Site Admin role. This vulnerability is due to insufficient validation and authentication when accessing REST API endpoints. An attacker could exploit this vulnerability if they are able to send a crafted API request to an affected endpoint. A successful exploit could allow the attacker to read sensitive information and make configuration changes across tenant boundaries with the privileges of the Site Admin user. 

Frequently asked questions

What is CVE-2026-20223?: A vulnerability in the access validation of internal REST APIs of Cisco Secure Workload could allow an unauthenticated, remote attacker to access site resources with the privileges of the Site Admin role. This vulnerability is due to insufficient validation and authentication when accessing REST API endpoints. An attacker could exploit this vulnerability if they are able to send a crafted API request to an affected endpoint. A successful exploit could allow the attacker to read sensitive information and make configuration changes across tenant boundaries with the privileges of the Site Admin user. 
How severe is CVE-2026-20223?: CVE-2026-20223 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-20223 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (53rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20223?: CVE-2026-20223 affects Cisco Secure Workload. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-20223?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-20223 have an EU (EUVD) identifier?: Yes. CVE-2026-20223 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-31131.
When was CVE-2026-20223 published?: CVE-2026-20223 was published on 2026-05-20 and last updated on 2026-06-30.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-csw-pnbsa-g8WEnuy

Affected products (1)

cpe:2.3:a:cisco:secure_workload:*:*:*:*:*:*:*:*

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