CVE-2023-40045Network attack vector

Browser script execution via reflected transfer payload

Published Sep 27, 2023 · Updated Sep 24, 2024

Reflected XSS in Progress WS_FTP Server 8.7.0 through 8.7.3 and 8.8.0 through 8.8.1 allows remote attackers to execute browser scripts. The Ad Hoc Transfer module reflects a specialized payload into a user's browser, but Progress has not disclosed the affected request field or deficient output-encoding operation. Exploitation requires a user to open the attacker-supplied request; successful script execution occurs in that user's browser context and can act with that web session's access.

CVSS severity8.3
High
EPSS probability0.90%
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 Progress WS_FTP Server 8.7.0 through 8.7.3 and 8.8.0 through 8.8.1 allows remote attackers to execute browser scripts. The Ad Hoc Transfer module reflects a specialized payload into a user's browser, but Progress has not disclosed the affected request field or deficient output-encoding operation. Exploitation requires a user to open the attacker-supplied request; successful script execution occurs in that user's browser context and can act with that web session's access.

The record

CVE
CVE-2023-40045
Published
Sep 27, 2023
Updated
Sep 24, 2024
Vendor
Progress Software Corporation
Product
WS_FTP Server
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 27, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 24, 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=8.7.0 <8.7.4
  2. Affected versionversion=8.8.0 <8.8.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Progress Software Corporation · WS_FTP Serverversion=8.7.0 <8.7.4; version=8.8.0 <8.8.2

Published CVSS scores

8.3Progress Software CorporationCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
6.1NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
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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