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CVE-2026-117533 Details

ANALYZED

This CVE record has been analyzed and enriched by NVDAPI.com as an independent party.

Description

REDAXO from 5.18.0 before 5.21.4 contains a stored cross-site scripting vulnerability because rex_media_service moves uploaded SVG files into the public media folder before sanitizing them. Authenticated users with mediapool upload rights can race the sanitizer or exhaust memory limits to leave script-laden SVGs publicly served, executing scripts in victims' backend sessions.

Metrics

CVSS 3.x Severity and Vector Strings:

VolerionCVSS-B:5.4 MEDIUMVector:CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

CNA: [email protected]CVSS-B:4.4 MEDIUMVector:CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:L/I:L/A:N

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://github.com/redaxo/core/security/advisories/GHSA-2p3g-jr7p-qwwx	[email protected]	AdvisoryRemedyVendor
https://www.vulncheck.com/advisories/redaxo-5.18.0-before-5.21.4-stored-xss-via-unsanitized-mediapool-svg-uploads	[email protected]	AdvisoryVendor

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-79	Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')	[email protected]

Affected Products

Product	Versions
REDAXO	>= 5.18.0, <= 5.21.3 (semver)
CPE cpe:2.3:a:redaxo:redaxo:::::::: Remediation Upgrade: 5.21.4moderate effort Workaround:low effort Restrict permissions for authenticated backend accounts with mediapool upload or edit rights to trusted users. Workaround:low effort Block SVG uploads by adding the extension to the mediapool's blocklist in the boot.php of your project addon: $mediapool = rex_addon::get('mediapool'); $mediapool->setProperty('blocked_extensions', [...$mediapool->getProperty('blocked_extensions'), 'svg']); Mitigation:low effort Prevent script execution for delivered SVGs at the web server level. For Apache, in the .htaccess of your media folder: <FilesMatch "\.svg$"> Header always set Content-Security-Policy "sandbox" Header always set X-Content-Type-Options "nosniff" </FilesMatch> This stops scripts inside an SVG from running when the file is opened directly, while regular embedding via <img> keeps working. Test it against your setup before rolling it out; media_manager and CDN configurations may need adjusting.

Product

Versions

REDAXO

>= 5.18.0, <= 5.21.3 (semver)

CPE

cpe:2.3:a:redaxo:redaxo:*:*:*:*:*:*:*:*

Remediation

Upgrade: 5.21.4moderate effort
Workaround:low effort
Restrict permissions for authenticated backend accounts with mediapool upload or edit rights to trusted users.
Workaround:low effort
Block SVG uploads by adding the extension to the mediapool's blocklist in the boot.php of your project addon: $mediapool = rex_addon::get('mediapool'); $mediapool->setProperty('blocked_extensions', [...$mediapool->getProperty('blocked_extensions'), 'svg']);
Mitigation:low effort
Prevent script execution for delivered SVGs at the web server level. For Apache, in the .htaccess of your media folder: <FilesMatch "\.svg$"> Header always set Content-Security-Policy "sandbox" Header always set X-Content-Type-Options "nosniff" </FilesMatch> This stops scripts inside an SVG from running when the file is opened directly, while regular embedding via <img> keeps working. Test it against your setup before rolling it out; media_manager and CDN configurations may need adjusting.

Change History

2 change records found show changes

Date	Action	Recorded By
Oct 27, 2026	CVE Modified	CISA-ADP
Oct 27, 2026	New CVE Received	[email protected]