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CVE-2026-117538

REDAXO before 5.21.0 Reflected XSS via Packages API function Parameter

MEDIUM
4.1
CVSS Score
Published: October 27, 2026 at 10:59 AM UTC
Updated: October 27, 2026 at 03:02 PM UTC
1 product affected across 1 vendorRedaxo

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Severity
MEDIUM4.1
Exploit prediction
EPSS 0.2%

Description

REDAXO before 5.21.0 contains a reflected cross-site scripting vulnerability in the backend packages API, where the function parameter is concatenated into an error message rendered without HTML escaping. Attackers can lure an authenticated backend user to a crafted link containing a valid CSRF token, executing JavaScript that performs same-origin actions or reads DOM data.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Redaxo· Redaxo
90%
All versions
Vendor states this is fixed in 5.21.0 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Vendor Advisory
Source: cverecord
https://github.com/redaxo/core/security/advisories/GHSA-xq4j-g85q-wf97
Third Party Advisory
Source: cverecord
https://www.vulncheck.com/advisories/redaxo-before-5.21.0-reflected-xss-via-packages-api-function-parameter

CVSS

4.1MEDIUMVulnCheck
Attack Vector
NETWORK
Complexity
HIGH
Privileges
HIGH
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
LOW
Availability
LOW
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-79

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