CVE-2024-8703Public exploitNetwork attack vector

Stored XSS via logged User-Agent header

Published May 15, 2025 · Updated May 17, 2025

Stored XSS in Z-Downloads before 1.11.6 allows remote attackers to run scripts in an administrator's browser through share URLs. A share request records the unsanitized User-Agent header in the download log, and the log detail view outputs it without escaping. An administrator must create a shared download and open the attacker's log entry, allowing script execution in that administrator's WordPress session.

CVSS severity6.1
Medium
EPSS probability0.32%
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 Z-Downloads before 1.11.6 allows remote attackers to run scripts in an administrator's browser through share URLs. A share request records the unsanitized User-Agent header in the download log, and the log detail view outputs it without escaping. An administrator must create a shared download and open the attacker's log entry, allowing script execution in that administrator's WordPress session.

The record

CVE
CVE-2024-8703
Published
May 15, 2025
Updated
May 17, 2025
Vendor
URBAN BASE
Product
Z-Downloads
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 15, 2025CVE publishedPublication date reported by the CVE source.
  2. May 17, 2025Record 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=0 <1.11.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

URBAN BASE · Z-Downloadsversion=0 <1.11.6

Published CVSS scores

6.1CISA-ADPCVSS: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.

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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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

Public exploit references

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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