CVE-2026-20090Network attack vector

Administrative stored XSS via unvalidated input

Published Apr 1, 2026 · Updated Apr 1, 2026

Stored XSS in the Cisco IMC web management interface allows remote authenticated users with administrative privileges to run browser scripts. Cisco attributes the flaw to insufficient input validation but does not disclose the affected parameter or request handler. Exploitation requires administrative access and a targeted user to click a crafted link, enabling script execution or access to browser-based data.

CVSS severity4.8
Medium
EPSS probability0.24%
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 the Cisco IMC web management interface allows remote authenticated users with administrative privileges to run browser scripts. Cisco attributes the flaw to insufficient input validation but does not disclose the affected parameter or request handler. Exploitation requires administrative access and a targeted user to click a crafted link, enabling script execution or access to browser-based data.

The record

CVE
CVE-2026-20090
Published
Apr 1, 2026
Updated
Apr 1, 2026
Vendor
ClamAV
Product
Cisco Enterprise NFV Infrastructure Software
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 1, 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=3.10.1
  2. Affected versionversion=3.10.2
  3. Affected versionversion=3.10.3
  4. Affected versionversion=3.11.1
  5. Affected versionversion=3.11.2
  6. Affected versionversion=3.11.3
  7. Affected versionversion=3.12.1
  8. Affected versionversion=3.12.1a
  9. Affected versionversion=3.12.1b
  10. Affected versionversion=3.12.2
  11. Affected versionversion=3.12.3
  12. Affected versionversion=3.3.1
  13. Affected versionversion=3.4.1
  14. Affected versionversion=3.5.1
  15. Affected versionversion=3.5.2
  16. Affected versionversion=3.6.1
  17. Affected versionversion=3.6.2
  18. Affected versionversion=3.6.3
  19. Affected versionversion=3.7.1
  20. Affected versionversion=3.8.1
  21. Affected versionversion=3.9.1
  22. Affected versionversion=3.9.2
  23. Affected versionversion=4.10.1
  24. Affected versionversion=4.1.1
  25. Affected versionversion=4.11.1
  26. Affected versionversion=4.1.2
  27. Affected versionversion=4.12.1
  28. Affected versionversion=4.12.2
  29. Affected versionversion=4.12.3
  30. Affected versionversion=4.12.4
  31. Affected versionversion=4.12.5
  32. Affected versionversion=4.12.6
  33. Affected versionversion=4.13.1
  34. Affected versionversion=4.14.1
  35. Affected versionversion=4.15.1
  36. Affected versionversion=4.15.2
  37. Affected versionversion=4.15.3
  38. Affected versionversion=4.15.4
  39. Affected versionversion=4.16.1
  40. Affected versionversion=4.18.1
  41. Affected versionversion=4.18.2
  42. Affected versionversion=4.18.2a
  43. Affected versionversion=4.2.1
  44. Affected versionversion=4.2.2
  45. Affected versionversion=4.4.1
  46. Affected versionversion=4.4.2
  47. Affected versionversion=4.4.3
  48. Affected versionversion=4.5.1
  49. Affected versionversion=4.6.1
  50. Affected versionversion=4.6.2
  51. Affected versionversion=4.6.2-FC2
  52. Affected versionversion=4.6.2-FC3
  53. Affected versionversion=4.6.3
  54. Affected versionversion=4.6.3-FC4
  55. Affected versionversion=4.6.4
  56. Affected versionversion=4.6.5-ES1
  57. Affected versionversion=4.7.1
  58. Affected versionversion=4.8.1
  59. Affected versionversion=4.8.2
  60. Affected versionversion=4.9.1
  61. Affected versionversion=4.9.2
  62. Affected versionversion=4.9.2-FC5
  63. Affected versionversion=4.9.3
  64. Affected versionversion=4.9.4
  65. Affected versionversion=4.9.4-ES8
  66. Affected versionversion=4.9.4-ES9
  67. Affected versionversion=4.9.4-FC3
  68. Affected versionversion=4.9.5
  69. Affected versionversion=4.9.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ClamAV · Cisco Enterprise NFV Infrastructure Softwareversion=3.10.1; version=3.10.2; version=3.10.3; version=3.11.1; version=3.11.2; version=3.11.3; version=3.12.1; version=3.12.1a; version=3.12.1b; version=3.12.2; version=3.12.3; version=3.3.1; version=3.4.1; version=3.5.1; version=3.5.2; version=3.6.1; version=3.6.2; version=3.6.3; version=3.7.1; version=3.8.1; version=3.9.1; version=3.9.2; version=4.10.1; version=4.1.1; version=4.11.1; version=4.1.2; version=4.12.1; version=4.12.2; version=4.12.3; version=4.12.4; version=4.12.5; version=4.12.6; version=4.13.1; version=4.14.1; version=4.15.1; version=4.15.2; version=4.15.3; version=4.15.4; version=4.16.1; version=4.18.1; version=4.18.2; version=4.18.2a; version=4.2.1; version=4.2.2; version=4.4.1; version=4.4.2; version=4.4.3; version=4.5.1; version=4.6.1; version=4.6.2; version=4.6.2-FC2; version=4.6.2-FC3; version=4.6.3; version=4.6.3-FC4; version=4.6.4; version=4.6.5-ES1; version=4.7.1; version=4.8.1; version=4.8.2; version=4.9.1; version=4.9.2; version=4.9.2-FC5; version=4.9.3; version=4.9.4; version=4.9.4-ES8; version=4.9.4-ES9; version=4.9.4-FC3; version=4.9.5; version=4.9.6
ClamAV · Cisco Unified Computing System (Standalone)version=3.1(1d); version=3.1(2b); version=3.1(2c); version=3.1(2d); version=3.1(2e); version=3.1(2g); version=3.1(2i); version=3.1(3a); version=3.1(3b); version=3.1(3c); version=3.1(3d); version=3.1(3g); version=3.1(3h); version=3.1(3i); version=3.1(3j); version=3.1(3k); version=4.0(1.240); version=4.0(1a); version=4.0(1b); version=4.0(1c); version=4.0(1d); version=4.0(1e); version=4.0(1g); version=4.0(1h); version=4.0(2c); version=4.0(2d); version=4.0(2f); version=4.0(2g); version=4.0(2h); version=4.0(2i); version=4.0(2k); version=4.0(2l); version=4.0(2m); version=4.0(2n); version=4.0(2o); version=4.0(2p); version=4.0(2q); version=4.0(2r); version=4.0(4b); version=4.0(4c); version=4.0(4d); version=4.0(4e); version=4.0(4f); version=4.0(4h); version=4.0(4i); version=4.0(4j); version=4.0(4k); version=4.0(4l); version=4.0(4m); version=4.0(4n); version=4.1(1c); version=4.1(1d); version=4.1(1f); version=4.1(1g); version=4.1(1h); version=4.1(2a); version=4.1(2b); version=4.1(2d); version=4.1(2e); version=4.1(2f); version=4.1(2g); version=4.1(2h); version=4.1(2j); version=4.1(2k); version=4.1(2l); version=4.1(2m); version=4.1(3b); version=4.1(3c); version=4.1(3d); version=4.1(3f); version=4.1(3g); version=4.1(3h); version=4.1(3i); version=4.1(3l); version=4.1(3m); version=4.1(3n); version=4.2(1a); version=4.2(1b); version=4.2(1c); version=4.2(1e); version=4.2(1f); version=4.2(1g); version=4.2(1i); version=4.2(1j); version=4.2(2a); version=4.2(2f); version=4.2(2g); version=4.2(3b); version=4.2(3d); version=4.2(3e); version=4.2(3g); version=4.2(3h); version=4.2(3i); version=4.2(3j); version=4.2(3k); version=4.2(3l); version=4.2(3m); version=4.2(3n); version=4.2(3o); version=4.2(3p); version=4.3(1.230097); version=4.3(1.230124); version=4.3(1.230138); version=4.3(2.230207); version=4.3(2.230270); version=4.3(2.240002); version=4.3(2.240009); version=4.3(2.240037); version=4.3(2.240053); version=4.3(2.240077); version=4.3(2.240090); version=4.3(2.240107); version=4.3(2.250016); version=4.3(2.250021); version=4.3(2.250022); version=4.3(2.250037); version=4.3(2.250045); version=4.3(2.250063); version=4.3(3.240022); version=4.3(3.240041); version=4.3(3.240043); version=4.3(4.240142); version=4.3(4.240152); version=4.3(4.241014); version=4.3(4.241063); version=4.3(4.242028); version=4.3(4.242038); version=4.3(4.242066); version=4.3(4.252001); version=4.3(4.252002); version=4.3(5.240021); version=4.3(5.250001); version=4.3(5.250030); version=4.3(5.250033); version=4.3(5.250043); version=4.3(5.250045); version=4.3(6.250039); version=4.3(6.250040); version=4.3(6.250044); version=4.3(6.250053); version=4.3(6.250060); version=4.3(6.250101); version=4.3(6.250117); version=4.3(6.260003); version=6.0(1.250127); version=6.0(1.250130); version=6.0(1.250131); version=6.0(1.250174); version=6.0(1.250192); version=6.0(1.250194)
ClamAV · Cisco Unified Computing System E-Series Software (UCSE)version=2.0.0; version=2.1.0; version=2.2.1; version=2.2.2; version=2.3.1; version=2.3.2; version=2.3.3; version=2.3.5; version=2.4.0; version=2.4.1; version=2.4.2; version=3.0.1; version=3.0.2; version=3.1.0; version=3.1.1; version=3.1.2; version=3.1.3; version=3.1.4; version=3.1.5; version=3.2.1; version=3.2.10; version=3.2.11.1; version=3.2.11.3; version=3.2.11.5; version=3.2.12.2; version=3.2.13.6; version=3.2.14; version=3.2.15; version=3.2.15.3; version=3.2.16.1; version=3.2.2; version=3.2.3; version=3.2.4; version=3.2.6; version=3.2.7; version=3.2.8; version=4.00; version=4.02; version=4.11.1; version=4.12.1; version=4.12.2; version=4.15.2

Published CVSS scores

4.8CiscoCVSS: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')
T1059.007Command and Scripting Interpreter: JavaScript/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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