CVE-2026-114470 Progressive Robot Ltd CVE debrief

Who should care

hMailServer administrators, security teams, and IT professionals responsible for managing and securing email servers should assess exposure and apply patches to prevent potential unauthorized actions.

Why it matters

The CSRF vulnerability in hMailServer's REST API requires attention from administrators and security teams to assess exposure and apply patches, as it can lead to unauthorized actions using a victim's credential.

• Potential unauthorized creation of domains, accounts, or API keys.
• Possible changes to settings by an attacker using a victim's credential.
• Need for verification of hMailServer versions and exposure to the CSRF vulnerability.
• Priority for applying patches or updates to hMailServer to fix the CSRF vulnerability.

Technical summary

The REST API of Progressive Robot hMailServer versions 6.0.0 through 6.3.6 is vulnerable to Cross-Site Request Forgery (CSRF). The API accepts HTTP Basic authentication, which can be exploited by an attacker to make an authenticated user's browser perform a state-changing request. This vulnerability allows a remote attacker to potentially lead to unauthorized actions such as creating a domain, account, or API key, or changing settings. The cross-site protection mechanisms do not cover HTTP Basic authentication, making it possible for an attacker to use a victim's cached Basic credential to perform actions.

Defensive priority

Medium priority for hMailServer administrators and security teams to assess exposure and apply patches.

Recommended defensive actions

• Assess exposure by checking if hMailServer versions 6.0.0 through 6.3.6 are in use.
• Apply patches or updates to hMailServer to fix the CSRF vulnerability.
• Implement additional security measures such as monitoring for suspicious activity and enforcing secure authentication mechanisms.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and source item provide details on the CSRF vulnerability in hMailServer. The REST API accepts HTTP Basic authentication, which is not protected by cross-site protection mechanisms. An attacker can exploit this by making a user with a cached Basic credential perform a state-changing request.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.