CVE-2023-40053Network attack vector

Authenticated content modification via HTML injection

Published Dec 6, 2023 · Updated Aug 2, 2024

HTML injection in SolarWinds Serv-U 15.4 and earlier allows remote authenticated users to insert content into shared-file views. The file-share function preserves attacker-controlled HTML instead of neutralizing it before the content is presented. A valid account is required, and the published impact is limited to unauthorized content modification; no data disclosure or service interruption is reported.

CVSS severity5.0
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

HTML injection in SolarWinds Serv-U 15.4 and earlier allows remote authenticated users to insert content into shared-file views. The file-share function preserves attacker-controlled HTML instead of neutralizing it before the content is presented. A valid account is required, and the published impact is limited to unauthorized content modification; no data disclosure or service interruption is reported.

The record

CVE
CVE-2023-40053
Published
Dec 6, 2023
Updated
Aug 2, 2024
Vendor
SolarWinds
Product
Serv-U
Classifications
CWE-20, CAPEC-500, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 6, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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=15.4 and previous versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

SolarWinds · Serv-Uversion=15.4 and previous versions

Published CVSS scores

5.0NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N
5.0SolarWindsCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-20Improper Input Validation
CAPEC-500WebView Injection
T1190Exploit Public-Facing Application

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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