How severe is CVE-2026-20087?

CVE-2026-20087 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-20087 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20087?

CVE-2026-20087 primarily affects Cisco Enterprise Nfv Infrastructure Software. In total, 262 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20087?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-20087 have an EU (EUVD) identifier?

Yes. CVE-2026-20087 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17939.

When was CVE-2026-20087 published?

CVE-2026-20087 was published on 2026-04-01 and last updated on 2026-08-28.

CVE-2026-20087

CVE-2026-20087 is a medium-severity vulnerability in Cisco Enterprise Nfv Infrastructure Software with a CVSS 3.x base score of 4.8. 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-79.

Key facts

Severity: Medium (CVSS 3.x base score 4.8)
EPSS exploit prediction: 0% (6th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-17939
Weakness: CWE-79
Affected product: Cisco Enterprise Nfv Infrastructure Software
Published: 2026-04-01
Last modified: 2026-08-28

Description

A vulnerability in the web-based management interface of Cisco IMC could allow an authenticated, remote attacker with administrative privileges to conduct a stored XSS attack against a user of the interface. This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.

Frequently asked questions

What is CVE-2026-20087?: A vulnerability in the web-based management interface of Cisco IMC could allow an authenticated, remote attacker with administrative privileges to conduct a stored XSS attack against a user of the interface. This vulnerability is due to insufficient validation of user input. An attacker could exploit this vulnerability by persuading a user of an affected interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.
How severe is CVE-2026-20087?: CVE-2026-20087 has a CVSS 3.x base score of 4.8, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-20087 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (6th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20087?: CVE-2026-20087 primarily affects Cisco Enterprise Nfv Infrastructure Software. In total, 262 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20087?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20087 have an EU (EUVD) identifier?: Yes. CVE-2026-20087 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-17939.
When was CVE-2026-20087 published?: CVE-2026-20087 was published on 2026-04-01 and last updated on 2026-08-28.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-cimc-xss-A2tkgVAB

Affected products (262)

cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.3.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.4.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.5.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.5.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.6.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.6.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.6.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.7.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.8.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.9.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.9.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.10.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.10.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.10.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.11.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.11.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.11.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.12.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.12.1a:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.12.1b:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.12.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:3.12.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.1.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.1.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.2.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.2.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.4.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.4.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.4.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.5.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.6.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.6.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.6.2-fc2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.6.2-fc3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.6.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.6.3-fc4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.6.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.6.5-es1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.7.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:enterprise_nfv_infrastructure_software:4.8.1:*:*:*:*:*:*:*

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