CVE-2026-20076Network attack vector

Administrative stored XSS via insufficient input validation

Published Jan 15, 2026 · Updated Jan 15, 2026

Stored XSS in Cisco Identity Services Engine allows remote authenticated users to execute scripts in an interface user's browser. The web-management interface stores inadequately validated input on specific pages and later renders the injected code in another user's browser. Exploitation requires valid administrative credentials and user interaction, and it exposes browser-based information or modifies interface content without interrupting the service.

CVSS severity4.8
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Cisco Identity Services Engine allows remote authenticated users to execute scripts in an interface user's browser. The web-management interface stores inadequately validated input on specific pages and later renders the injected code in another user's browser. Exploitation requires valid administrative credentials and user interaction, and it exposes browser-based information or modifies interface content without interrupting the service.

The record

CVE
CVE-2026-20076
Published
Jan 15, 2026
Updated
Jan 15, 2026
Vendor
ClamAV
Product
Cisco Identity Services Engine
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.1.0
  2. Affected versionversion=3.1.0 p1
  3. Affected versionversion=3.1.0 p10
  4. Affected versionversion=3.1.0 p2
  5. Affected versionversion=3.1.0 p3
  6. Affected versionversion=3.1.0 p4
  7. Affected versionversion=3.1.0 p5
  8. Affected versionversion=3.1.0 p6
  9. Affected versionversion=3.1.0 p7
  10. Affected versionversion=3.1.0 p8
  11. Affected versionversion=3.1.0 p9
  12. Affected versionversion=3.2.0
  13. Affected versionversion=3.2.0 p1
  14. Affected versionversion=3.2.0 p2
  15. Affected versionversion=3.2.0 p3
  16. Affected versionversion=3.2.0 p4
  17. Affected versionversion=3.2.0 p5
  18. Affected versionversion=3.2.0 p6
  19. Affected versionversion=3.2.0 p7
  20. Affected versionversion=3.3.0
  21. Affected versionversion=3.3 Patch 1
  22. Affected versionversion=3.3 Patch 2
  23. Affected versionversion=3.3 Patch 3
  24. Affected versionversion=3.3 Patch 4
  25. Affected versionversion=3.4.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ClamAV · Cisco Identity Services Engineversion=3.1.0; version=3.1.0 p1; version=3.1.0 p10; version=3.1.0 p2; version=3.1.0 p3; version=3.1.0 p4; version=3.1.0 p5; version=3.1.0 p6; version=3.1.0 p7; version=3.1.0 p8; version=3.1.0 p9; version=3.2.0; version=3.2.0 p1; version=3.2.0 p2; version=3.2.0 p3; version=3.2.0 p4; version=3.2.0 p5; version=3.2.0 p6; version=3.2.0 p7; version=3.3.0; version=3.3 Patch 1; version=3.3 Patch 2; version=3.3 Patch 3; version=3.3 Patch 4; version=3.4.0

Published CVSS scores

4.8Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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