# CVE-2026-45247: Mirasvit Full Page Cache Warmer Deserialization of Untrusted Data

> Unauthenticated attackers can achieve remote code execution via PHP object injection in the CacheWarmer cookie of the Mirasvit Cache Warmer plugin.

- **Severity:** Critical 9.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Yes, since 3 Jun 2026 (CISA KEV)
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 26 May 2026
- **Updated:** 4 Jun 2026
- **Also known as:** GHSA-rg8p-9rpg-r32p

## What is CVE-2026-45247?

CVE-2026-45247 is a critical unsafe deserialization vulnerability in Mirasvit Full Page Cache Warmer for Magento 2, published on 26 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Mirasvit Full Page Cache Warmer for Magento 2 before version 1.11.12 contains a PHP object injection vulnerability that allows unauthenticated attackers to achieve remote code execution by supplying a crafted serialized PHP object in the CacheWarmer cookie. Attackers can exploit the unrestricted call to PHP's native unserialize() function combined with gadget chains available in Magento and its dependencies to execute arbitrary code on the server.

Weakness: CWE-502 (Deserialization of Untrusted Data)

## Which versions are affected by CVE-2026-45247?

It affects 1 product.


Products: Mirasvit Full Page Cache Warmer.

## How do I fix CVE-2026-45247?

No fix has been published for CVE-2026-45247 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 6 Jun 2026.

## Is CVE-2026-45247 being exploited?

Yes. Attackers have exploited CVE-2026-45247 in the wild since at least 3 Jun 2026.

Public exploit code:

- CVE-2026-45247 - Draft (github_poc): https://github.com/HORKimhab/CVE-2026-45247
- PoC funcional de CVE-2026-45247: PHP Object Injection a RCE no autenticado en Mirasvit Full Page Cache (Magento 2). (github_poc): https://github.com/fevar54/PoC-Funcional---CVE-2026-45247-Mirasvit-Full-Page-Cache-Warmer-RCE-

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45247 and fix it if it is affected.

What it is: CVE-2026-45247 is a critical unsafe deserialization vulnerability in Mirasvit Full Page Cache Warmer for Magento 2, published on 26 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2026-45247 in the wild since at least 3 Jun 2026.

Affected product: Mirasvit Full Page Cache Warmer for Magento 2. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-45247/ (Markdown: https://insights.sbomify.com/CVE-2026-45247/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45247
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45247
- OSV: https://osv.dev/vulnerability/CVE-2026-45247

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45247/
Summaries are generated and may contain mistakes; the official description above is the record.