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Exploited vulnerability · CISA KEV

Is CVE-2026-45247 exploited? Yes: in CISA KEV since 3 Jun 2026

Gociux · Mirasvit Full Page Cache Warmer · data: CISA KEV, CVE record, FIRST EPSS

Yes. CVE-2026-45247, Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability, is being exploited in the wild. CISA added it to its Known Exploited Vulnerabilities catalog on 3 Jun 2026, 8 days after it was published. It affects Mirasvit Full Page Cache Warmer. If you run it, CISA's required action is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

exploitedYesCISA KEV · 3 Jun 2026
ransomwareNot knownno confirmed use
EPSStop 5%very likely to be exploited
severity9.8CVSS 3.1 · critical
US federal due6 Jun 2026BOD 22-01 deadline

What it is

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.

VendorMirasvit (1 exploited CVE in KEV)
ProductMirasvit Full Page Cache Warmer
VulnerabilityMirasvit Full Page Cache Warmer Deserialization of Untrusted Data Vulnerability
WeaknessCWE-502
Published26 May 2026
Added to KEV3 Jun 2026
Reported by (CNA)VulnCheck

What to do

  1. Check whether you run it. Look for Mirasvit Full Page Cache Warmer in your asset inventory, including appliances and cloud images. Stack check lists every exploited Mirasvit CVE at once.
  2. Apply the fix. Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
  3. If you can't patch today, take the affected service off the internet or restrict who can reach it, and check its logs for signs of compromise since 26 May 2026.
  4. Get told next time. Email alerts when CISA adds a CVE for Mirasvit.

References

Questions

Is CVE-2026-45247 being exploited?

Yes. CISA added CVE-2026-45247 to the Known Exploited Vulnerabilities catalog on 3 Jun 2026, which means there is reliable evidence of exploitation in the wild.

Is CVE-2026-45247 used in ransomware attacks?

CISA does not list known ransomware use for it. That can change, and exploitation alone is reason to fix it first.

How do I fix CVE-2026-45247?

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Check Mirasvit's advisory for the fixed versions, and if you can't patch quickly, restrict access to the affected Mirasvit Full Page Cache Warmer and watch it for signs of compromise.

Sources: CISA KEV (exploitation, ransomware use, required action, due date), the CVE record (publication date, CVSS, CNA), NVD and FIRST EPSS (live score). More: all KEV additions in June 2026 · act-now radar.

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