CISA Warns of Actively Exploited Mirasvit Cache Vulnerability

• 703 words, ~3 min read

---
title: "CISA Warns of Actively Exploited Mirasvit Cache Vulnerability"
short_title: "CISA adds critical Mirasvit cache vulnerability"
description: "CISA has added CVE-2026-45247, a deserialization flaw in Mirasvit Full Page Cache Warmer, to its KEV Catalog. Learn why patching is urgent."
author: "Vitus"
date: 2024-10-02
categories: [Cybersecurity, Vulnerabilities]
tags: [cisa, cve-2026-45247, vulnerability, deserialization, threat-intelligence]
score: 0.85
cve_ids: [CVE-2026-45247]
---

## TL;DR
CISA has added CVE-2026-45247, a deserialization of untrusted data vulnerability in Mirasvit Full Page Cache Warmer, to its Known Exploited Vulnerabilities (KEV) Catalog due to evidence of active exploitation. Federal agencies must patch immediately, while all organizations are urged to prioritize remediation to mitigate risks.

Main Content

The Cybersecurity and Infrastructure Security Agency (CISA) has escalated its response to a critical vulnerability in Mirasvit Full Page Cache Warmer, adding it to the Known Exploited Vulnerabilities (KEV) Catalog. The flaw, tracked as CVE-2026-45247, involves deserialization of untrusted data and is being actively exploited in the wild. This poses a significant threat to federal agencies and organizations worldwide, emphasizing the need for immediate action.

### Key Points
- CVE-2026-45247 is a deserialization vulnerability in Mirasvit Full Page Cache Warmer, a popular caching solution for e-commerce platforms.
- CISA’s Binding Operational Directive (BOD) 22-01 mandates federal agencies to remediate the flaw by the specified due date to protect against active threats.
- While BOD 22-01 applies only to Federal Civilian Executive Branch (FCEB) agencies, CISA urges all organizations to prioritize patching this vulnerability.
- Exploitation of this flaw could allow attackers to execute arbitrary code, leading to unauthorized access, data breaches, or system compromise.

### Technical Details
CVE-2026-45247 is a deserialization of untrusted data vulnerability. Deserialization flaws occur when an application processes maliciously crafted data, allowing attackers to execute arbitrary code or manipulate system behavior. In this case, the vulnerability affects Mirasvit Full Page Cache Warmer, a widely used extension for optimizing website performance, particularly in e-commerce environments.

The flaw arises from insufficient validation of user-supplied input during deserialization, enabling attackers to inject malicious payloads. Successful exploitation could lead to remote code execution (RCE), granting attackers full control over the affected system.

### Impact Assessment
The inclusion of CVE-2026-45247 in CISA’s KEV Catalog underscores its severity and the urgency of remediation. Here’s why this vulnerability is a major concern:

  1. Active Exploitation: Evidence of in-the-wild exploitation means attackers are already targeting unpatched systems.
  2. Federal Mandate: FCEB agencies are required to patch the flaw by the deadline specified in BOD 22-01, or risk compliance violations.
  3. Broader Risk: While federal agencies are the primary focus, all organizations using Mirasvit Full Page Cache Warmer are at risk. E-commerce platforms, in particular, could face severe disruptions, including data theft, financial loss, or reputational damage.
  4. Attack Surface: Deserialization vulnerabilities are a favored attack vector for cybercriminals due to their potential for remote code execution and lateral movement within networks.

### Mitigation Steps
To protect against CVE-2026-45247, organizations should take the following steps:

  1. Apply Patches Immediately: Update Mirasvit Full Page Cache Warmer to the latest version, which includes fixes for the vulnerability.
  2. Review CISA’s KEV Catalog: Regularly monitor the KEV Catalog for updates on actively exploited vulnerabilities.
  3. Enhance Monitoring: Deploy intrusion detection systems (IDS) and endpoint protection solutions to detect and block exploitation attempts.
  4. Educate Teams: Ensure IT and security teams are aware of the vulnerability and the urgency of patching.
  5. Follow CISA Guidelines: Adhere to best practices outlined in BOD 22-01 for vulnerability management, even if your organization is not federally mandated.

## Conclusion
The addition of CVE-2026-45247 to CISA’s KEV Catalog serves as a critical reminder of the ongoing threats posed by unpatched vulnerabilities. Organizations must act swiftly to remediate this flaw, particularly given its active exploitation in the wild. While federal agencies face mandatory deadlines, all businesses using Mirasvit Full Page Cache Warmer should prioritize patching to avoid falling victim to cyberattacks.

Stay vigilant, keep systems updated, and leverage CISA’s resources to stay ahead of emerging threats.

## References
[^1]: CISA. "CISA Adds One Known Exploited Vulnerability to Catalog". Retrieved 2024-10-02.
[^2]: CVE. "CVE-2026-45247 Detail". Retrieved 2024-10-02.
[^3]: CISA. "Binding Operational Directive 22-01". Retrieved 2024-10-02.

Related CVEs