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
0.2%
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?
Exploit prediction (EPSS)0.2% · higher than 7% of CVEs
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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