CVE-2019-9540Network attack vector

Browser-session script execution via crafted prefs.asp URI

Published Jan 3, 2020 · Updated Aug 4, 2024

Reflected XSS in prefs.asp in Telos Automated Message Handling System before 4.1.5.5 allows remote attackers to run script in AMHS sessions. The page places input from a specially crafted AMHS URI into generated HTML without neutralizing script content. Execution requires a user to open the crafted URI, and the injected code runs in that user's browser session, enabling access to or modification of session-visible data.

CVSS severity6.1
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in prefs.asp in Telos Automated Message Handling System before 4.1.5.5 allows remote attackers to run script in AMHS sessions. The page places input from a specially crafted AMHS URI into generated HTML without neutralizing script content. Execution requires a user to open the crafted URI, and the injected code runs in that user's browser session, enabling access to or modification of session-visible data.

The record

CVE
CVE-2019-9540
Published
Jan 3, 2020
Updated
Aug 4, 2024
Vendor
Telos Corporation
Product
Automated Message Handling System
Classifications
CWE-79, T1204.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 3, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <4.1.5.5

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Telos Corporation · Automated Message Handling Systemversion=unspecified <4.1.5.5

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
6.4CERT/CCAV:N/AC:L/Au:N/C:P/I:P/A:N
5.0CERT/CCAV:N/AC:L/Au:N/C:P/I:P/A:N/E:POC/RL:OF/RC:C
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.001User Execution: Malicious Link

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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