Security readout for executives and security teams
Plain-English summary
CVE-2026-24378 is a critical vulnerability in the WordPress EventPrime plugin through version 4.2.8.0. An unauthenticated remote attacker may be able to abuse unsafe data deserialization, potentially leading to full compromise of the affected WordPress site. Public sources provided do not state active exploitation or a fixed version.
Executive priority
Prioritize within emergency patching workflows for any public WordPress site using EventPrime through 4.2.8.0. The combination of unauthenticated remote reachability and potential full site impact makes business risk high, even though active exploitation is not confirmed in the provided sources.
Technical view
The issue is CWE-502, deserialization of untrusted data, in Metagauss EventPrime eventprime-event-calendar-management through 4.2.8.0. The CVSS 3.1 score is 9.8 with network attack vector, low complexity, no privileges, and no user interaction. Impact is rated high for confidentiality, integrity, and availability.
Likely exposure
Exposure is likely for WordPress sites with the EventPrime plugin installed at version 4.2.8.0 or earlier. Internet-facing WordPress deployments are the primary concern. Sites without this plugin, or running a version confirmed unaffected by vendor guidance, are not indicated as affected by the supplied sources.
Exploitation context
The CVE is not listed as CISA KEV in the supplied data, and no cited source states active exploitation. However, the vulnerability class and CVSS vector indicate it is remotely reachable, unauthenticated, low complexity, and potentially high impact if a vulnerable installation is exposed.
Researcher notes
Public details in the supplied bundle are limited. The record identifies CWE-502 object injection and the affected version range, but does not provide sink details, gadget requirements, proof-of-concept status, or a named fixed version. Avoid assuming exploitability conditions beyond the CVSS and advisory data.
Mitigation direction
- Inventory WordPress sites for the EventPrime plugin and installed version.
- If running 4.2.8.0 or earlier, treat the site as high priority.
- Check Metagauss, WordPress plugin, or Patchstack guidance for a fixed version.
- If no fix is available, consider disabling or removing the plugin.
- Restrict administrative access and harden WordPress while remediation is pending.
- Review recent backups before making plugin changes.
Validation and detection
- Confirm whether EventPrime is installed on each WordPress site.
- Record the installed plugin version and compare against <= 4.2.8.0.
- Check vendor or Patchstack advisory pages for updated remediation details.
- Review web and application logs for unusual requests around EventPrime functionality.
- Verify remediation by confirming the vulnerable version is no longer active.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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 lookupCVE-2026-24378 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
- No
- 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.
CVSS vector scores
1 official scoreWe 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:H3.95.9Primary CVE scoreVulnerability scoring details
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
Source materials
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.