GestSup before 3.2.61 Remote Code Execution via IMAP Attachment (CVE-2026-100389) | HOL Guard CVE

Critical · CVSS 9.2CVE-2026-100389

GestSup before 3.2.61 Remote Code Execution via IMAP Attachment

Answer in brief

CVE-2026-100389 records a Critical severity (CVSS 9.2) vulnerability in GestSup before 3.2.61 Remote Code Execution via IMAP Attachment. The current sources do not mark it as known exploited. The current feed maps GestSup/GestSup (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Critical · CVSS 9.2
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

CVSS is 9.2. 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.

Affected scope and exposure questions

The current feed maps GestSup/GestSup (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
GestSup/GestSupgeneric	>=0 <3.2.61	3.2.61

Recommended response

Check inventory. Check lockfiles and deployed manifests for GestSup/GestSup.
Review the reported fix. Update GestSup/GestSup to 3.2.61 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source description

GestSup versions before 3.2.61 contain a remote code execution vulnerability in the basic IMAP connector's attachment handling that fails to skip blocked file extensions. Unauthenticated attackers can send emails with PHP attachments to monitored mailboxes, which are written to the web-accessible upload/ticket directory and executed when accessed.

Quoted source text, attributed separately from HOL analysis.