CVE-2026-63002Public exploitNetwork attack vectorHinoki check available

Backend session theft via unescaped media filenames

Published Sep 23, 2026 · Updated Sep 23, 2026

Stored XSS in REDAXO Core 5.21.1 and earlier allows attackers to run script in a backend user's browser through a media filename. The Mediapool Sync page inserts filenames from $diffFiles into labels, input values, and lists without applying rex_escape(). Exploitation requires placing an unregistered metacharacter-bearing file in the media directory and a backend user with media[sync] permission opening the page, enabling session theft or unauthorized backend actions.

CVSS severity4.8
Medium
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in REDAXO Core 5.21.1 and earlier allows attackers to run script in a backend user's browser through a media filename. The Mediapool Sync page inserts filenames from $diffFiles into labels, input values, and lists without applying rex_escape(). Exploitation requires placing an unregistered metacharacter-bearing file in the media directory and a backend user with media[sync] permission opening the page, enabling session theft or unauthorized backend actions.

The record

CVE
CVE-2026-63002
Published
Sep 23, 2026
Updated
Sep 23, 2026
Vendor
REDAXO
Product
REDAXO Core
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 2026Record 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=< 5.21.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

REDAXO · REDAXO Coreversion=< 5.21.2

Published CVSS scores

4.8GitHubCVSS:3.1/AV:N/AC:L/PR:H/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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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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