What products are affected by CVE-2026-45247?

CVE-2026-45247 affects Mirasvit Full Page Cache Warmer. Refer to the vendor advisory and NVD record for affected versions.

What is the EPSS score for CVE-2026-45247?

CVE-2026-45247 has an EPSS score of 6.1%, placing it in the 91th percentile. This means it has a 6.1% probability of being exploited in the next 30 days, higher than 91% of all known vulnerabilities. EPSS (Exploit Prediction Scoring System) is maintained by FIRST and uses real-world threat data to estimate exploitation likelihood.

Actively Exploited — CISA KEV

CVE-2026-45247: Mirasvit Full Page Cache Warmer Critical Vulnerability

Severity: Critical | CVSS 3.1: 9.8 | Published: 2026-05-26 | KEV Added: 2026-06-03

What is CVE-2026-45247?

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.

Technical Analysis

Weakness Classification

This vulnerability is classified as CWE-502 — Deserialization of Untrusted Data. The application deserializes untrusted data without sufficient validation, which can lead to remote code execution, denial of service, or other attacks.

Attack Vector Breakdown

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: High
Integrity: High
Availability: High

Impact Analysis

This vulnerability is exploitable over the network, meaning any system reachable via the internet or internal network is potentially at risk without physical access. The attack complexity is low, requires no special privileges, and needs no user interaction — making it straightforward to exploit at scale. Successful exploitation can result in full confidentiality breach (complete data disclosure), complete integrity compromise (data modification or code execution), total availability loss (denial of service). The application deserializes untrusted data without sufficient validation, which can lead to remote code execution, denial of service, or other attacks.

Exploitation Probability (EPSS): 6.1% chance of exploitation in the next 30 days (91th percentile). While the base probability may appear low, inclusion in CISA KEV confirms real-world exploitation is already occurring.

Is CVE-2026-45247 being exploited?

Yes. CVE-2026-45247 is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, restricted to CVEs with confirmed active exploitation in the wild. CISA added this vulnerability on 2026-06-03. Inclusion in KEV triggers the patching mandate under BOD 22-01 for U.S. federal civilian agencies, with a remediation deadline of 2026-06-06.

How to fix CVE-2026-45247

Apply the security update issued by Mirasvit for Mirasvit Full Page Cache Warmer. If an immediate patch is not possible, consult the vendor advisory for mitigation guidance, restrict network exposure of the affected service, and monitor logs for indicators of exploitation. CISA's Known Exploited Vulnerabilities catalog requires U.S. federal agencies to remediate this vulnerability by the due date shown below under Binding Operational Directive 22-01. Private organizations should treat KEV entries as priority-one patches because active exploitation has been confirmed in the wild.

Related Vulnerabilities

Other actively exploited vulnerabilities sharing the same weakness pattern (CWE-502 — Deserialization of Untrusted Data):

CVE-2023-21529 (High 8.8) [same CWE] — Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2026-20131 (Critical 10.0) [same CWE] — A vulnerability in the web-based management interface of Cisco Secure Firewall…
CVE-2026-20963 (Critical 9.8) [same CWE] — Deserialization of untrusted data in Microsoft Office SharePoint allows an…
CVE-2025-26399 (Critical 9.8) [same CWE] — SolarWinds Web Help Desk was found to be susceptible to an unauthenticated…
CVE-2025-49113 (Critical 9.9) [same CWE] — Roundcube Webmail before 1.5.10 and 1.6.x before 1.6.11 allows remote code…

Frequently asked questions

Is CVE-2026-45247 critical?

CVE-2026-45247 has a CVSS 3.1 base score of 9.8 — Critical severity. It should be treated as a priority patch, especially given the active exploitation confirmed by CISA.

Is CVE-2026-45247 being actively exploited?

Yes — CISA added CVE-2026-45247 to the Known Exploited Vulnerabilities catalog on 2026-06-03. Inclusion in KEV means CISA has confirmed in-the-wild exploitation.

How do I patch CVE-2026-45247?

Apply the security update from Mirasvit for Mirasvit Full Page Cache Warmer. Federal agencies must remediate by 2026-06-06 under BOD 22-01.

What type of vulnerability is CVE-2026-45247?

CVE-2026-45247 is classified under CWE-502 (Deserialization of Untrusted Data). The application deserializes untrusted data without sufficient validation, which can lead to remote code execution, denial of service, or other attacks.

What is the CVSS score for CVE-2026-45247?

CVE-2026-45247 has a CVSS 3.1 base score of 9.8, classifying it as Critical severity. The attack vector is Network, attack complexity is Low, and no privileges are required.