CVE-2025-2749 Kentico Kentico Xperience: dangerous file upload
In plain words: The program accepts files it should refuse, such as programs disguised as ordinary uploads. The attacker can place and run their own tools on the server.
Confirmed exploited by CISA on · US federal patch deadline May 4, 2026
What to do
- Install Kentico's security update for Kentico Xperience. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Patch edge devices first — attackers often start scanning for them within hours of a fix.
- Never expose the device's admin page to the internet.
- After patching a device that was exposed, follow the vendor's compromise checks, end active sessions and change passwords.
Who is affected
Work IT. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.
What's at risk: They face the internet and guard the whole network, so a flaw here can hand attackers a way in — and these devices usually run no antivirus, so break-ins go unnoticed.
The details
- Official name
- Kentico Xperience Path Traversal Vulnerability
- Product
- Kentico Kentico Xperience
- CISA description
- Kentico Xperience contains a path traversal vulnerability that could allow an authenticated user's Staging Sync Server to upload arbitrary data to path relative locations.
- Type of flaw
- Dangerous file upload (CWE-22, CWE-434)
- Confirmed exploited
- Apr 20, 2026
- US federal patch deadline
- May 4, 2026
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Answering about CVE-2025-2749 ·
Questions about CVE-2025-2749
Is CVE-2025-2749 being exploited?
Yes. CISA added CVE-2025-2749 to its Known Exploited Vulnerabilities catalog on Apr 20, 2026, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2025-2749?
Install Kentico's security update for Kentico Xperience. If no update exists, follow the vendor's workaround or stop using the product until one ships. Patch edge devices first — attackers often start scanning for them within hours of a fix.
Am I affected by CVE-2025-2749?
Only if you use Kentico Kentico Xperience. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.