Answer in brief
CVE-2026-18488 records a Medium severity (CVSS 6.4) vulnerability in Blocksy Companion <= 2.1.51 - Authenticated (Author+) Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data). The current sources do not mark it as known exploited. The current feed maps creativethemeshq/Blocksy Companion (generic), creativethemeshq/Blocksy Companion (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 6.4. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps creativethemeshq/Blocksy Companion (generic), creativethemeshq/Blocksy Companion (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| creativethemeshq/Blocksy Companiongeneric | >=0 <=2.1.51 | Not reported |
| creativethemeshq/Blocksy Companiongeneric | 0 | Not reported |
Published upstream
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 1, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 1, 2026
The Blocksy Companion plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'tagName' Block Attribute (blocksy/dynamic-data) in all versions up to, and including, 2.1.51 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
Quoted source text, attributed separately from HOL analysis.