Answer in brief
CVE-2026-24423 records a Critical severity (CVSS 9.8) vulnerability in SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API. The current sources mark it as known exploited. The current feed maps SmarterTools/SmarterMail (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 9.8. Known-exploitation status makes exposure review time-sensitive. 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 SmarterTools/SmarterMail (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| SmarterTools/SmarterMailgeneric | >=0 <100.0.9511 | 100.0.9511 |
Published upstream
Jan 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Feb 5, 2026
Evidence: source:kev:kev:kev:recordSmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. This command will be executed by the vulnerable application.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-24423 records a Critical severity (CVSS 9.8) vulnerability in SmarterTools SmarterMail < Build 9511 Unauthenticated RCE via ConnectToHub API. The current sources mark it as known exploited. The current feed maps SmarterTools/SmarterMail (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 9.8. Known-exploitation status makes exposure review time-sensitive. 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 SmarterTools/SmarterMail (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:smartertools:smartermail:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| SmarterTools/SmarterMailgeneric | >=0 <100.0.9511 | 100.0.9511 |
Published upstream
Jan 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
May 24, 2026
Added to CISA KEV
Feb 5, 2026
Evidence: source:kev:kev:kev:recordSmarterTools SmarterMail versions prior to build 9511 contain an unauthenticated remote code execution vulnerability in the ConnectToHub API method. The attacker could point the SmarterMail to the malicious HTTP server, which serves the malicious OS command. This command will be executed by the vulnerable application.
Quoted source text, attributed separately from HOL analysis.