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Rejetto HFS operators should check their server version and update any installation earlier than 3.2.1. Security reporting says attackers are probing for CVE-2026-61500, a weakness in HFS 3.x session-cookie signing that can reportedly allow forged administrator sessions and remote code execution. The reported probes are a warning to act, not proof that any particular server was compromised.
What is happening with Rejetto HFS?
BleepingComputer reported on October 5, 2026, that VulnCheck Canary Intelligence honeypots had observed probes against HFS deployments in Japan and the United States. The article characterized the activity as small-scale reconnaissance from one China Telecom IP. In its October 2 report, VulnCheck said its honeypots began observing exploitation activity on October 1. These are attributed observations; they do not establish that every probe succeeded or that any specific HFS operator was breached. BleepingComputer’s report and VulnCheck’s report describe the activity.
VulnCheck estimated roughly 100 internet-facing HFS instances in its October 2, 2026 report. Treat that as VulnCheck’s estimate at that time, not a complete count of exposed or vulnerable servers.
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CVE-2026-61500 is reported as a session-cookie signing weakness affecting the HFS 3.x line. According to the security reporting, a remote unauthenticated attacker may be able to forge a session cookie with administrator privileges, then use HFS server-side functionality to execute code on the server. That combination makes the issue a critical remote-code-execution risk: a successful attack could give an outsider a path from unauthenticated access to server control. BleepingComputer and VulnCheck report this attack path.
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The technical details here are attributed to those reports. A direct Rejetto advisory with a full technical description was not available in the sources cited here.
Which HFS versions are affected, and what fixes the flaw?
Security reporting identifies HFS versions earlier than 3.2.1 as affected and 3.2.1 as containing the fix. The Rejetto project’s releases page listed version 3.3.4 as latest when accessed for this article; release status can change, so check the official HFS releases page for the current stable release and its notes before deploying an update.
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- Earlier than 3.2.1: Reported affected by CVE-2026-61500; update promptly.
- 3.2.1 or later: At or beyond the reported fixed version for this vulnerability. Still check the project’s current release notes and update policy.
Confirm the version actually running on each server. Do not infer it from the operating system, when the machine was installed, or when another HFS instance was last updated.
Do not confuse this flaw with the older HFS vulnerability
CVE-2026-61500 is distinct from CVE-2024-23692. The older issue affected HFS through and including 2.3m and involved unauthenticated template injection that could lead to arbitrary command execution; the GitHub Advisory Database says that release is unsupported. It is not the same bug or version line as the newly reported 3.x session-cookie weakness. See the GitHub Advisory Database entry for CVE-2024-23692.
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What HFS operators should do now
- Inventory installations. Find HFS servers across your environment, including internet-facing, forgotten, and test systems.
- Verify each running version. Identify whether any instance is earlier than 3.2.1 rather than relying on assumptions about its age or host operating system.
- Update vulnerable installations. Use the official Rejetto releases page to choose the current stable project release, review its notes, and follow the project’s upgrade guidance.
- Assess exposed systems for signs of compromise. If a server was reachable from the internet while running a vulnerable version, review logs and unexpected administrative changes through your organization’s incident-response process. Scanning alone does not prove a compromise; the cited reporting does not establish that the described probes successfully compromised a victim.
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