Medium severity · published Oct 27, 2026
CVE-2026-117538
REDAXO before 5.21.0 Reflected XSS via Packages API function Parameter
New
4.1
CVSS
–
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
High
Privileges
High
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CO
core · redaxo
before 5.21.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-117538
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-117538
github.com
https://github.com/redaxo/core/security/advisories/GHSA-xq4j-g85q-wf97
www.vulncheck.com
https://www.vulncheck.com/advisories/redaxo-before-5.21.0-reflected-xss-via-packages-api-function-parameter
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