CVE-2026-20091Network attack vector

Stored script execution via insufficient input validation

Published Feb 25, 2026 · Updated Feb 25, 2026

Stored XSS in Cisco FXOS and UCS Manager, including affected ASA bundles, allows remote authenticated users to run browser script. The interface stores malicious data submitted to unspecified pages without sufficient validation, then renders it as active script to another user. Exploitation requires Administrator or AAA Administrator credentials and a victim to open the affected page; script runs in the interface origin and can read browser-based data.

CVSS severity4.8
Medium
EPSS probability0.17%
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 FXOS and UCS Manager, including affected ASA bundles, allows remote authenticated users to run browser script. The interface stores malicious data submitted to unspecified pages without sufficient validation, then renders it as active script to another user. Exploitation requires Administrator or AAA Administrator credentials and a victim to open the affected page; script runs in the interface origin and can read browser-based data.

The record

CVE
CVE-2026-20091
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
ClamAV
Product
Cisco Adaptive Security Appliance (ASA) Software
Classifications
CWE-79, T1189
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 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=9.12.1
  2. Affected versionversion=9.12.1.2
  3. Affected versionversion=9.12.1.3
  4. Affected versionversion=9.12.2
  5. Affected versionversion=9.12.2.1
  6. Affected versionversion=9.12.2.5
  7. Affected versionversion=9.12.2.9
  8. Affected versionversion=9.12.3
  9. Affected versionversion=9.12.3.12
  10. Affected versionversion=9.12.3.2
  11. Affected versionversion=9.12.3.7
  12. Affected versionversion=9.12.3.9
  13. Affected versionversion=9.12.4
  14. Affected versionversion=9.12.4.10
  15. Affected versionversion=9.12.4.13
  16. Affected versionversion=9.12.4.18
  17. Affected versionversion=9.12.4.2
  18. Affected versionversion=9.12.4.24
  19. Affected versionversion=9.12.4.26
  20. Affected versionversion=9.12.4.29
  21. Affected versionversion=9.12.4.30
  22. Affected versionversion=9.12.4.35
  23. Affected versionversion=9.12.4.37
  24. Affected versionversion=9.12.4.38
  25. Affected versionversion=9.12.4.39
  26. Affected versionversion=9.12.4.4
  27. Affected versionversion=9.12.4.40
  28. Affected versionversion=9.12.4.41
  29. Affected versionversion=9.12.4.47
  30. Affected versionversion=9.12.4.48
  31. Affected versionversion=9.12.4.50
  32. Affected versionversion=9.12.4.52
  33. Affected versionversion=9.12.4.54
  34. Affected versionversion=9.12.4.55
  35. Affected versionversion=9.12.4.56
  36. Affected versionversion=9.12.4.58
  37. Affected versionversion=9.12.4.62
  38. Affected versionversion=9.12.4.65
  39. Affected versionversion=9.12.4.67
  40. Affected versionversion=9.12.4.7
  41. Affected versionversion=9.12.4.8
  42. Affected versionversion=9.16.1
  43. Affected versionversion=9.16.1.28
  44. Affected versionversion=9.16.2
  45. Affected versionversion=9.16.2.11
  46. Affected versionversion=9.16.2.13
  47. Affected versionversion=9.16.2.14
  48. Affected versionversion=9.16.2.3
  49. Affected versionversion=9.16.2.7
  50. Affected versionversion=9.16.3
  51. Affected versionversion=9.16.3.14
  52. Affected versionversion=9.16.3.15
  53. Affected versionversion=9.16.3.19
  54. Affected versionversion=9.16.3.23
  55. Affected versionversion=9.16.3.3
  56. Affected versionversion=9.16.4
  57. Affected versionversion=9.16.4.14
  58. Affected versionversion=9.16.4.19
  59. Affected versionversion=9.16.4.27
  60. Affected versionversion=9.16.4.38
  61. Affected versionversion=9.16.4.39
  62. Affected versionversion=9.16.4.42
  63. Affected versionversion=9.16.4.48
  64. Affected versionversion=9.16.4.55
  65. Affected versionversion=9.16.4.57
  66. Affected versionversion=9.16.4.61
  67. Affected versionversion=9.16.4.62
  68. Affected versionversion=9.16.4.67
  69. Affected versionversion=9.16.4.71
  70. Affected versionversion=9.16.4.76
  71. Affected versionversion=9.16.4.82
  72. Affected versionversion=9.16.4.84
  73. Affected versionversion=9.16.4.9
  74. Affected versionversion=9.17.1
  75. Affected versionversion=9.17.1.10
  76. Affected versionversion=9.17.1.11
  77. Affected versionversion=9.17.1.13
  78. Affected versionversion=9.17.1.15
  79. Affected versionversion=9.17.1.20
  80. Affected versionversion=9.17.1.30
  81. Affected versionversion=9.17.1.33
  82. Affected versionversion=9.17.1.39
  83. Affected versionversion=9.17.1.45
  84. Affected versionversion=9.17.1.7
  85. Affected versionversion=9.17.1.9
  86. Affected versionversion=9.18.1
  87. Affected versionversion=9.18.1.3
  88. Affected versionversion=9.18.2
  89. Affected versionversion=9.18.2.5
  90. Affected versionversion=9.18.2.7
  91. Affected versionversion=9.18.2.8
  92. Affected versionversion=9.18.3
  93. Affected versionversion=9.18.3.39
  94. Affected versionversion=9.18.3.46
  95. Affected versionversion=9.18.3.53
  96. Affected versionversion=9.18.3.55
  97. Affected versionversion=9.18.3.56
  98. Affected versionversion=9.18.4
  99. Affected versionversion=9.18.4.22
  100. Affected versionversion=9.18.4.24
  101. Affected versionversion=9.18.4.29
  102. Affected versionversion=9.18.4.34
  103. Affected versionversion=9.18.4.40
  104. Affected versionversion=9.18.4.47
  105. Affected versionversion=9.18.4.5
  106. Affected versionversion=9.18.4.50
  107. Affected versionversion=9.18.4.52
  108. Affected versionversion=9.18.4.53
  109. Affected versionversion=9.18.4.57
  110. Affected versionversion=9.18.4.8
  111. Affected versionversion=9.19.1
  112. Affected versionversion=9.19.1.12
  113. Affected versionversion=9.19.1.18
  114. Affected versionversion=9.19.1.22
  115. Affected versionversion=9.19.1.24
  116. Affected versionversion=9.19.1.27
  117. Affected versionversion=9.19.1.28
  118. Affected versionversion=9.19.1.31
  119. Affected versionversion=9.19.1.37
  120. Affected versionversion=9.19.1.42
  121. Affected versionversion=9.19.1.5
  122. Affected versionversion=9.19.1.9
  123. Affected versionversion=9.20.2
  124. Affected versionversion=9.20.2.10
  125. Affected versionversion=9.20.2.21
  126. Affected versionversion=9.20.2.22
  127. Affected versionversion=9.20.3
  128. Affected versionversion=9.20.3.10
  129. Affected versionversion=9.20.3.13
  130. Affected versionversion=9.20.3.16
  131. Affected versionversion=9.20.3.20
  132. Affected versionversion=9.20.3.4
  133. Affected versionversion=9.20.3.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

ClamAV · Cisco Adaptive Security Appliance (ASA) Softwareversion=9.12.1; version=9.12.1.2; version=9.12.1.3; version=9.12.2; version=9.12.2.1; version=9.12.2.5; version=9.12.2.9; version=9.12.3; version=9.12.3.12; version=9.12.3.2; version=9.12.3.7; version=9.12.3.9; version=9.12.4; version=9.12.4.10; version=9.12.4.13; version=9.12.4.18; version=9.12.4.2; version=9.12.4.24; version=9.12.4.26; version=9.12.4.29; version=9.12.4.30; version=9.12.4.35; version=9.12.4.37; version=9.12.4.38; version=9.12.4.39; version=9.12.4.4; version=9.12.4.40; version=9.12.4.41; version=9.12.4.47; version=9.12.4.48; version=9.12.4.50; version=9.12.4.52; version=9.12.4.54; version=9.12.4.55; version=9.12.4.56; version=9.12.4.58; version=9.12.4.62; version=9.12.4.65; version=9.12.4.67; version=9.12.4.7; version=9.12.4.8; version=9.16.1; version=9.16.1.28; version=9.16.2; version=9.16.2.11; version=9.16.2.13; version=9.16.2.14; version=9.16.2.3; version=9.16.2.7; version=9.16.3; version=9.16.3.14; version=9.16.3.15; version=9.16.3.19; version=9.16.3.23; version=9.16.3.3; version=9.16.4; version=9.16.4.14; version=9.16.4.19; version=9.16.4.27; version=9.16.4.38; version=9.16.4.39; version=9.16.4.42; version=9.16.4.48; version=9.16.4.55; version=9.16.4.57; version=9.16.4.61; version=9.16.4.62; version=9.16.4.67; version=9.16.4.71; version=9.16.4.76; version=9.16.4.82; version=9.16.4.84; version=9.16.4.9; version=9.17.1; version=9.17.1.10; version=9.17.1.11; version=9.17.1.13; version=9.17.1.15; version=9.17.1.20; version=9.17.1.30; version=9.17.1.33; version=9.17.1.39; version=9.17.1.45; version=9.17.1.7; version=9.17.1.9; version=9.18.1; version=9.18.1.3; version=9.18.2; version=9.18.2.5; version=9.18.2.7; version=9.18.2.8; version=9.18.3; version=9.18.3.39; version=9.18.3.46; version=9.18.3.53; version=9.18.3.55; version=9.18.3.56; version=9.18.4; version=9.18.4.22; version=9.18.4.24; version=9.18.4.29; version=9.18.4.34; version=9.18.4.40; version=9.18.4.47; version=9.18.4.5; version=9.18.4.50; version=9.18.4.52; version=9.18.4.53; version=9.18.4.57; version=9.18.4.8; version=9.19.1; version=9.19.1.12; version=9.19.1.18; version=9.19.1.22; version=9.19.1.24; version=9.19.1.27; version=9.19.1.28; version=9.19.1.31; version=9.19.1.37; version=9.19.1.42; version=9.19.1.5; version=9.19.1.9; version=9.20.2; version=9.20.2.10; version=9.20.2.21; version=9.20.2.22; version=9.20.3; version=9.20.3.10; version=9.20.3.13; version=9.20.3.16; version=9.20.3.20; version=9.20.3.4; version=9.20.3.7
ClamAV · Cisco Firepower eXtensible Operating System (FXOS)version=2.14.1.131; version=2.14.1.143; version=2.14.1.163; version=2.14.1.167; version=2.16.0.128
ClamAV · Cisco UCS Managerversion=4.0(1a); version=4.0(1b); version=4.0(1c); version=4.0(1d); version=4.0(2a); version=4.0(2b); version=4.0(2d); version=4.0(2e); version=4.0(4a); version=4.0(4b); version=4.0(4c); version=4.0(4d); version=4.0(4e); version=4.0(4f); version=4.0(4g); version=4.0(4h); version=4.0(4i); version=4.0(4k); version=4.0(4l); version=4.0(4m); version=4.0(4n); version=4.0(4o); version=4.1(1a); version=4.1(1b); version=4.1(1c); version=4.1(1d); version=4.1(1e); version=4.1(2a); version=4.1(2b); version=4.1(2c); version=4.1(3a); version=4.1(3b); version=4.1(3c); version=4.1(3d); version=4.1(3e); version=4.1(3f); version=4.1(3h); version=4.1(3i); version=4.1(3j); version=4.1(3k); version=4.1(3l); version=4.1(3m); version=4.1(3n); version=4.1(4a); version=4.2(1c); version=4.2(1d); version=4.2(1f); version=4.2(1i); version=4.2(1k); version=4.2(1l); version=4.2(1m); version=4.2(1n); version=4.2(2a); version=4.2(2c); version=4.2(2d); version=4.2(2e); 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(2b); version=4.3(2c); version=4.3(2e); version=4.3(2f); version=4.3(3a); version=4.3(3c); version=4.3(4a); version=4.3(4b); version=4.3(4c); version=4.3(4d); version=4.3(4e); version=4.3(4f); version=4.3(5a); version=4.3(5c); version=4.3(5d); version=4.3(5e)

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')
T1189Drive-by Compromise

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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