Security readout for executives and security teams
Plain-English summary
CVE-2026-25429 is a critical vulnerability in the WordPress Nexa Blocks plugin. Sites using Nexa Blocks version 1.1.1 or earlier may be exposed to unsafe PHP object handling. The public record rates it highly severe, but the provided sources do not confirm active exploitation or name a fixed version.
Executive priority
Treat this as urgent for any organization using Nexa Blocks on public WordPress sites. The vulnerability is rated critical and requires no authentication, but current sources do not confirm exploitation or a patch. Focus on rapid inventory, exposure reduction, and vendor-guided remediation.
Technical view
The issue is CWE-502, deserialization of untrusted data, allowing PHP object injection in wpdive Nexa Blocks through version 1.1.1. The CVSS 3.1 score is 9.8 with network access, low complexity, no privileges, and no user interaction required. Impact is rated high for confidentiality, integrity, and availability.
Likely exposure
Exposure is likely limited to WordPress installations with the Nexa Blocks plugin installed, especially public-facing sites running version 1.1.1 or earlier. The provided data does not identify other affected products or platforms.
Exploitation context
The CVE is not listed as KEV in the supplied data, and no cited source confirms active exploitation. Risk remains high because the CVSS vector describes remote, unauthenticated exploitation with no user interaction and high potential impact.
Researcher notes
Public details are limited. The record identifies unsafe deserialization and PHP object injection but does not provide vulnerable code paths, parameters, proof-of-concept details, exploitation evidence, or a confirmed fixed version in the supplied sources.
Mitigation direction
- Inventory WordPress sites for the Nexa Blocks plugin.
- Check installed Nexa Blocks versions against 1.1.1 or earlier.
- Review vendor and Patchstack guidance for fixed versions or official mitigations.
- If acceptable, deactivate or remove the plugin until remediation is confirmed.
- Prioritize public-facing and business-critical WordPress sites first.
Validation and detection
- Confirm whether Nexa Blocks is installed on each WordPress site.
- Record plugin version and compare with the affected range.
- Verify whether a vendor-fixed version is available before upgrading.
- Check web logs and security alerts for unusual plugin-related activity.
- Document remediation status for each affected WordPress instance.
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-2026-25429 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.