CVE-2026-45247 Mirasvit Mirasvit Full Page Cache Warmer: unsafe data loading
In plain words: The program unpacks saved data from outside without checking it is safe. Usually lets an attacker run code on the server.
Confirmed exploited by CISA on · US federal patch deadline Jun 6, 2026
What to do
- Install Mirasvit's security update for Mirasvit Full Page Cache Warmer. If no update exists, follow the vendor's workaround or stop using the product until one ships.
- Keep a list of every internet-facing server you run so nothing is forgotten.
- Patch anything in this catalog first, ahead of normal patch cycles.
- Put admin and file-transfer apps behind a VPN or single sign-on instead of the open internet.
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: Mass data theft and ransomware: a single flaw in a file-transfer or email server has exposed thousands of organisations at once.
The details
- Official name
- Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability
- Product
- Mirasvit Mirasvit Full Page Cache Warmer
- CISA description
- Mirasvit Full Page Cache Warmer contains a deserialization of untrusted data vulnerability that could allow unauthenticated attackers to achieve remote code execution by supplying a crafted serialized PHP object in the CacheWarmer cookie.
- Type of flaw
- Unsafe data loading (CWE-502)
- Confirmed exploited
- Jun 3, 2026
- US federal patch deadline
- Jun 6, 2026
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Answering about CVE-2026-45247 ·
Questions about CVE-2026-45247
Is CVE-2026-45247 being exploited?
Yes. CISA added CVE-2026-45247 to its Known Exploited Vulnerabilities catalog on Jun 3, 2026, which means there is reliable evidence of real-world attacks.
How do I fix CVE-2026-45247?
Install Mirasvit's security update for Mirasvit Full Page Cache Warmer. If no update exists, follow the vendor's workaround or stop using the product until one ships. Keep a list of every internet-facing server you run so nothing is forgotten.
Am I affected by CVE-2026-45247?
Only if you use Mirasvit Mirasvit Full Page Cache Warmer. Aimed mostly at company systems — you are affected through the companies you use, not your own phone.