Read the docs
TI-2020-19026 Aliases CVE-2020-36891GHSA-fcwr-xg8x-ppc3

Kentico Xperience <= 12.0.49 File Upload Stored XSS

Priority LOW 23CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-79.

Summary

A stored cross-site scripting vulnerability in Kentico Xperience allows attackers to upload files with spoofed Content-Type that do not match file extensions. Attackers can exploit this vulnerability by uploading malicious files with manipulated MIME types, allowing malicious scripts to execute in users' browsers.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00218 12th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
KenticoXperienceup to 12.0.49—No fix listedCNA
  • Xperience VendorKentico Affected up to 12.0.49 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:kentico:xperience:*:*:*:*:*:*:*:*up to 12.0.49VulnerableKentico
  • cpe:2.3:a:kentico:xperience:*:*:*:*:*:*:*:* Versions up to 12.0.49 Vulnerable ·Kentico

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-36891
  2. 2026-10-03 Alias added: GHSA-fcwr-xg8x-ppc3

References

Patch 1

  • TI-2025-02400 Kentico Xperience <= 13.0.178 Staging Sync Server None Password Type Authentication Bypass KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-02399 Kentico Xperience <= 13.0.172 Staging Sync Server Digest Password Authentication Bypass KEVCVSS 3.1CRITICAL 9.8
  • TI-2019-07394 An issue was discovered in Kentico 12.0.x before 12.0.15, 11.0.x before 11.0.48, 10.0.x… KEVCVSS 3.1CRITICAL 9.8
  • TI-2025-02402 Kentico Xperience <= 13.0.178 Staging Media File Upload Authenticated RCE KEVCVSS 3.1HIGH 7.2
  • TI-2025-23449 Unrestricted file upload in Kentico Xperience CVSS 3.1CRITICAL 9.8
  • TI-2017-12981 Kentico 9.0 before 9.0.51 and 10.0 before 10.0.48 allows remote attackers to obtain… CVSS 3.0CRITICAL 9.8
See all 49 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences