CVE-2020-9055

Authenticated script execution via unsanitized form input

Published Mar 30, 2020 · Updated Sep 16, 2024

Stored XSS in Versiant LYNX Customer Service Portal 3.5.2 allows local users to run JavaScript in another user's browser. User forms accept special characters without sanitizing or escaping their values, allowing injected script to be stored and rendered to later viewers. Authenticated portal access and a victim viewing the stored value are required; execution can redirect the site, expose session cookies, or disclose browser-accessible information.

CVSS severity3.9
Low
EPSS probability0.51%
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 Versiant LYNX Customer Service Portal 3.5.2 allows local users to run JavaScript in another user's browser. User forms accept special characters without sanitizing or escaping their values, allowing injected script to be stored and rendered to later viewers. Authenticated portal access and a victim viewing the stored value are required; execution can redirect the site, expose session cookies, or disclose browser-accessible information.

The record

CVE
CVE-2020-9055
Published
Mar 30, 2020
Updated
Sep 16, 2024
Vendor
Versiant
Product
LYNX Customer Service Portal
Classifications
CWE-79, T1203
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 30, 2020CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 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=3.5.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Versiant · LYNX Customer Service Portalversion=3.5.2

Published CVSS scores

2.9CERT/CC Vulnerability NoteAV:L/AC:L/Au:S/C:N/I:P/A:P/E:POC/RL:U/RC:C
3.9CERT/CCCVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L
3.2CERT/CC Vulnerability NoteAV:L/AC:L/Au:S/C:N/I:P/A:P
3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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