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PatchSiren cyber security CVE debrief

CVE-2026-104400 bPlugins CVE debrief

CVE-2026-104400 is a Stored Cross-site Scripting (XSS) vulnerability in the B Blocks plugin for WordPress, affecting versions from n/a through 2.1.8. The vulnerability has a CVSS score of 6.5 and is classified as MEDIUM severity. The CVE record was published on 2026-10-05T09:17:08.067Z and has not been modified since then. Defenders responsible for WordPress installations using the B Blocks plugin should assess exposure and prioritize verification of affected versions. The vulnerability requires verification of exposure and potential updates or compensating controls to prevent exploitation. Further verification of affected versions and potential impact is required based on the CVE

Vendor
bPlugins
Product
B Blocks
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-05
Original CVE updated
2026-10-05
Advisory published
2026-10-05
Advisory updated
2026-10-05

Who should care

Defenders responsible for WordPress installations using the B Blocks plugin should assess exposure and prioritize verification of affected versions.

Why it matters

CVE-2026-104400 is a Stored XSS vulnerability in the B Blocks WordPress plugin, requiring verification of exposure and potential updates or compensating controls to prevent exploitation.

  • Verification of exposure for WordPress installations using B Blocks plugin versions up to 2.1.8
  • Potential for attackers to inject malicious scripts
  • Need for updates or compensating controls to prevent exploitation

Technical summary

The B Blocks plugin for WordPress is vulnerable to Stored Cross-site Scripting (XSS) attacks. The vulnerability affects versions from n/a through 2.1.8 and has been assigned a CVSS score of 6.5. The CVE record indicates that the vulnerability was published on 2026-10-05T09:17:08.067Z and has not been modified since then.

Defensive priority

Defenders should prioritize verifying exposure of WordPress installations using B Blocks plugin versions up to 2.1.8 and assess the need for updates or compensating controls.

Recommended defensive actions

  • Verify WordPress installations for B Blocks plugin versions up to 2.1.8
  • Assess the need for updates or patches
  • Consider compensating controls for input validation and output encoding

Evidence notes

The CVE record and NVD entry provide limited information about the vulnerability, with the primary source being the Patchstack audit report. Further verification of affected versions and potential impact is required.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-104400 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-104400

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-104400 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-104400

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.