Security readout for executives and security teams
Plain-English summary
CVE-2026-45247 is a critical flaw in Mirasvit Full Page Cache Warmer for Magento 2 before 1.11.12. An unauthenticated attacker can potentially run code on the server by abusing unsafe PHP object handling in a cookie. Because CISA lists it in KEV, treat exposed Magento stores as urgent.
Executive priority
Emergency priority for affected ecommerce environments. This is a remotely exploitable, unauthenticated RCE with KEV confirmation. Patch or remove exposure immediately, starting with revenue-generating and internet-facing Magento stores.
Technical view
The issue is CWE-502 PHP object injection caused by unrestricted use of PHP unserialize() on the CacheWarmer cookie. Available Magento and dependency gadget chains can lead to remote code execution. The reported CVSS is 9.8, network-exploitable, low complexity, no privileges, and no user interaction.
Likely exposure
Organizations running Magento 2 with Mirasvit Full Page Cache Warmer versions before 1.11.12 are the stated exposure group. Internet-facing ecommerce sites are the highest-priority assets to check. The provided sources do not identify other affected Mirasvit products.
Exploitation context
Active exploitation is supported by the CISA KEV listing. The vulnerability is unauthenticated and remote, with potential confidentiality, integrity, and availability impact. Public technical descriptions exist, but defenders should avoid reproducing exploit chains and focus on inventory, patching, and detection review.
Researcher notes
Sansec describes the vulnerable data path as a crafted serialized PHP object in the CacheWarmer cookie reaching native unserialize(). Analysis should focus on version confirmation, exposure mapping, log review, and whether Magento dependency gadget chains are reachable. Do not assume compromise solely from presence; validate with telemetry.
Mitigation direction
- Identify Magento 2 sites using Mirasvit Full Page Cache Warmer.
- Upgrade Mirasvit Cache Warmer to version 1.11.12 or later.
- Prioritize internet-facing production ecommerce systems first.
- Review vendor changelog and advisory guidance for deployment specifics.
- Use WAF or monitoring controls as temporary risk reduction only.
Validation and detection
- Confirm installed module version on each Magento 2 environment.
- Verify patched systems report version 1.11.12 or later.
- Check web logs for suspicious CacheWarmer cookie activity.
- Review application and server logs for unexpected code execution indicators.
- Confirm CISA KEV-driven remediation tracking is complete.
Public sources used
Michael Williams reviewed this cited source version on .
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-502: Code execution behavior lookup
Code execution and unsafe deserialization weaknesses often justify reviewing execution behavior and process telemetry. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-45247 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.8 (3.1)
- Known Exploited
- Yes
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CISA KEV status
SSVC decision data
CVSS vector scores
2 official scoresWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H3.95.9VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N——VulnCheckVulnerability scoring details
Base CVSS 4.0 score
9.3CriticalVector: 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
Base CVSS 3.1 score
9.8CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- Added to KEVCISA-ADP
CISA Known Exploited Vulnerabilities metadata lists this CVE as known exploited.
- ADP timelineCISA-ADP
CVE-2026-45247 added to CISA KEV
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
- 2026-06-03T00:00:00.000Z: CVE-2026-45247 added to CISA KEV
Source materials
- CVE List V5 sourceCVE List V5
- https://sansec.io/research/mirasvit-cache-warmer-object-injectionCVE reference, VulnCheck · technical-description
- https://mirasvit.com/package/changelog/?package=mirasvit/module-cache-warmerCVE reference, VulnCheck · release-notes, patch
- https://www.vulncheck.com/advisories/mirasvit-cache-warmer-for-magento-php-object-injectionCVE reference, VulnCheck · third-party-advisory
- https://www.imperva.com/blog/imperva-customers-protected-against-cve-2026-45247-in-mirasvit-full-page-cache-warmer-for-magento/CVE reference, CISA-ADP · media-coverage
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-45247CVE reference, CISA-ADP · government-resource
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Deserialization of Untrusted Data
Deserialization of Untrusted Data represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.