CVE-2024-9663Public exploitNetwork attack vector

Stored XSS via unescaped remote-storage settings

Published May 15, 2025 · Updated May 16, 2025

Stored XSS in CYAN Backup before 2.5.3 allows remote authenticated users with administrator access to execute script in an admin browser. Remote-storage setting values are saved without sanitization and rendered without output escaping on plugin settings pages. Administrator-level access is required, and execution occurs when a privileged user views the stored payload; multisite can disallow unfiltered_html.

CVSS severity5.4
Medium
EPSS probability0.30%
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 CYAN Backup before 2.5.3 allows remote authenticated users with administrator access to execute script in an admin browser. Remote-storage setting values are saved without sanitization and rendered without output escaping on plugin settings pages. Administrator-level access is required, and execution occurs when a privileged user views the stored payload; multisite can disallow unfiltered_html.

The record

CVE
CVE-2024-9663
Published
May 15, 2025
Updated
May 16, 2025
Vendor
Greg Ross
Product
CYAN Backup
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. May 15, 2025CVE publishedPublication date reported by the CVE source.
  2. May 16, 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 <2.5.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Greg Ross · CYAN Backupversion=0 <2.5.3

Published CVSS scores

5.4CISA-ADPCVSS: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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

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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