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.
The record classifies CVE-2026-45247 under weakness class CWE-502. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 138 days ago.
Severity and exploitation probability
- CVSS v3.1 base score
- 9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS v4.0 base score
- 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 - EPSS (FIRST)
- 2.0% probability of exploitation in the next 30 days, higher than 81.0% of all scored CVEs
- CISA KEV
- Listed since 2026-06-03, federal remediation deadline 2026-06-06
- Threadlinqs priority
- 9/10 — CISA KEV-listed, which Threadlinqs floors at 9
- Published
- 2026-05-26, last modified 2026-06-04
Is CVE-2026-45247 being exploited?
CISA added CVE-2026-45247 to the Known Exploited Vulnerabilities catalog on 2026-06-03, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-06-06 under BOD 22-01. Weaponised exploit code for CVE-2026-45247 is publicly available. 2 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 43 in the Threadlinqs vulnerability feed.
Affected products and versions
- Mirasvit: Full Page Cache Warmer for Magento 2
How to fix CVE-2026-45247
Because CVE-2026-45247 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-06-06. No vendor patch reference has been recorded for CVE-2026-45247 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.
Threat activity tracking CVE-2026-45247
1 tracked threat in the Threadlinqs corpus references CVE-2026-45247, either in the campaign’s CVE list or as an indicator on the campaign record.
Sources
Enriched from CVE.org, FIRST EPSS, CISA KEV, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on .