Answer in brief
CVE-2026-66703 records a Medium severity (CVSS 6.5) vulnerability in WordPress MailOptin plugin <= 1.2.78.0 - Cross Site Scripting (XSS) vulnerability. The current sources do not mark it as known exploited. The current feed maps properfraction/MailOptin (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 6.5. 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 properfraction/MailOptin (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| properfraction/MailOptingeneric | n/a | Not reported |
Published upstream
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 6, 2026
Contributor Cross Site Scripting (XSS) in MailOptin <= 1.2.78.0 versions.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-66703 records a Medium severity (CVSS 6.5) vulnerability in WordPress MailOptin plugin <= 1.2.78.0 - Cross Site Scripting (XSS) vulnerability. The current sources do not mark it as known exploited. The current feed maps properfraction/MailOptin (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 6.5. 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 properfraction/MailOptin (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| properfraction/MailOptingeneric | n/a | Not reported |
Published upstream
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 6, 2026
Contributor Cross Site Scripting (XSS) in MailOptin <= 1.2.78.0 versions.
Quoted source text, attributed separately from HOL analysis.