CISA KEV Alert: CVE-2026-45247 Mirasvit Full Page Cache Warmer Deserialization Flaw Now Actively Exploited
What federal agencies and commercial organizations must do in the next 30 days to stay compliant under NIS2, SOC 2, ISO 27001, HIPAA, and PCI DSS
Published 2026-06-03
# CISA KEV Alert: CVE-2026-45247 Mirasvit Deserialization Flaw Is Actively Exploited—Your Compliance Clock Is Running
CISA has added CVE-2026-45247, a Deserialization of Untrusted Data vulnerability in the Mirasvit Full Page Cache Warmer extension, to its Known Exploited Vulnerabilities (KEV) Catalog, confirming that threat actors are actively weaponizing it in the wild.
What Happened and What the Rules Require
Deserialization vulnerabilities are among the most dangerous classes of flaws in web application stacks. When an attacker can feed maliciously crafted serialized data into an application, the result is often arbitrary code execution—effectively handing over the keys to the server. The Mirasvit Full Page Cache Warmer is a widely deployed Magento/Adobe Commerce extension, meaning e-commerce environments, payment processors, and their supply chains are squarely in the blast radius.
Under Binding Operational Directive (BOD) 22-01, all Federal Civilian Executive Branch (FCEB) agencies are legally required to remediate every KEV Catalog entry by its published due date. Missing that deadline is not a policy suggestion violation—it is a reportable compliance failure.
Beyond federal mandates, the ripple effect hits commercial organizations hard:
- NIS2 Directive: EU member-state operators of essential and important entities must implement vulnerability handling and incident reporting measures. A known-exploited, unpatched flaw is a direct trigger for supervisory scrutiny.
- PCI DSS v4.0: Requirement 6.3 demands that all vulnerabilities are ranked and remediated according to risk. An actively exploited CVE at the highest severity tier demands priority treatment.
- ISO 27001 / SOC 2: Controls around vulnerability management (A.8.8 in ISO 27001; CC7.1 in SOC 2 Trust Services Criteria) require documented evidence that known risks are identified, assessed, and resolved in a timely manner.
- HIPAA: Covered entities and business associates operating Magento-based patient portals or payment integrations carry added breach-notification exposure if this vulnerability is exploited against ePHI environments.
Why This Matters Right Now
KEV additions are not theoretical warnings—they confirm ongoing exploitation. The window between a KEV listing and widespread, opportunistic scanning by lower-skilled attackers is typically measured in hours, not days. Organizations that have not patched or mitigated by the time automated exploit kits incorporate this CVE face a sharply elevated probability of compromise.
For compliance teams, the stakes are compounded: a breach traced to a catalogued, unmitigated vulnerability is difficult to defend in a regulatory investigation under any of the five frameworks named above. Regulators and auditors will ask why a publicly documented, actively exploited flaw remained in your environment.
What You Should Do in the Next 7–30 Days
Days 1–7 — Identify and contain:
- Audit all environments running Mirasvit Full Page Cache Warmer and document version numbers.
- Apply the vendor's patch or disable the extension on any instance where a patch is not yet available.
- Review web-application firewall rules to add a compensating control blocking malformed deserialization payloads while patching is in progress.
- Pull ingestion logs for anomalous POST requests targeting serialization endpoints.
Days 8–30 — Document and report:
- Record remediation evidence (ticket references, change logs, scan results) for auditor review under SOC 2, ISO 27001, and PCI DSS.
- If you operate under NIS2 or HIPAA and exploitation is suspected, initiate your incident-response and breach-notification workflows immediately.
- Update your asset inventory and vulnerability management policy to reflect KEV Catalog monitoring as a standing control.
- Run a post-remediation authenticated scan to verify the patch is effective across all instances.
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