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Vendor Solution
Upgrade to hMailServer 6.3.6, whose webmail keeps a signer's certificate only when its chain is trusted, only under the From address the signature was verified for, and a different certificate for an address that has one only when the reader chooses to. After upgrading, review the correspondents' certificates on the webmail's Security page and remove any that should not be there. Until then: check the certificates listed for an address before sending it encrypted mail from the webmail, or encrypt in a mail program.
Tracking
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Thu, 08 Oct 2026 15:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
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Thu, 08 Oct 2026 12:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | Improper certificate validation in the webmail of Progressive Robot hMailServer 6.3.2 through 6.3.5 allows a remote unauthenticated attacker to have S/MIME-encrypted mail that the account later sends to another correspondent also encrypted to the attacker's key. When its recipient opened a signed message, the webmail kept the signer's certificate for encrypting replies whether or not the server found its chain trusted, under the first e-mail address the certificate listed rather than the message's From address, and beside any certificate already held for that address. Encrypted mail later sent from the webmail to that address was encrypted to every certificate held for it, so a holder of the kept certificate's key who obtains a copy of such a message can read it. | |
| Title | Improper Certificate Validation in hMailServer | |
| Weaknesses | CWE-295 | |
| References |
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| Metrics |
cvssV3_1
|
Subscriptions
No data.
Status: PUBLISHED
Assigner: GitLab
Published:
Updated: 2026-10-08T14:13:38.084Z
Reserved: 2026-10-08T11:17:47.802Z
Link: CVE-2026-107587
Updated: 2026-10-08T14:13:35.095Z
Status : Deferred
Published: 2026-10-08T12:17:16.937
Modified: 2026-10-08T21:02:43.860
Link: CVE-2026-107587
No data.
OpenCVE Enrichment
Updated: 2026-10-08T13:45:05Z
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CWE-295
Improper Certificate Validation