Find a vulnerability

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                "id": "CVE-2026-107586",
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          "value": "Uncontrolled eviction in the browser session table of the REST API in Progressive Robot hMailServer 6.2.28 through 6.3.5 allows a remote authenticated user to end other users\u0027 sessions. The table of browser sessions, shared by every account, the server administrator and support sessions, dropped its least recently used session whenever it was full, whoever it belonged to, and placed no limit on how many sessions one account could hold. A user who repeatedly signs in with their own mailbox password can therefore keep the table full and sign out every webmail and administration session that is idle for more than a short time, for as long as they continue."
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          "value": "Upgrade to hMailServer 6.3.6, in which each account or administrator holds at most fifty sessions and gives up its own least recently used one, and a full table makes room out of the sessions of whoever holds the most. Until then: limit the rate of POST /api/v1/session per client at a reverse proxy in front of the listener, and disable an account found signing in repeatedly (its sign-ins are in the application log and its device list)."
        }
      ],
      "title": "Allocation of Resources Without Limits or Throttling in hMailServer"
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          "value": "Uncontrolled eviction in the pending sign-in tables of the REST API in Progressive Robot hMailServer 6.3.4 and 6.3.5 allows a remote unauthenticated attacker to make other users\u0027 OpenID Connect, SAML and passkey sign-ins fail. The routes that start a single sign-on and hand out a passkey sign-in challenge are reached without authentication and stored pending state in bounded tables that dropped their oldest entry when full, whoever had started it. An attacker who starts sign-ins a few times a second (about a hundred a second for passkeys) pushes every other user\u0027s pending sign-in out of the table before that user\u0027s browser returns, denying single sign-on and passkey sign-in for as long as the requests continue."
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          "value": "Upgrade to hMailServer 6.3.6, in which a pending OpenID Connect, SAML or passkey sign-in is no longer held on the server at all but carried by the browser in a cookie sealed with AES-256-GCM under a key held only in memory and good once, so there is no table a flood of unauthenticated starts can fill. Until then: limit the rate of /portal/oidc/start, /portal/saml/start and /api/v1/passkeys/challenge per client at a reverse proxy, and keep password sign-in available for administrators."
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      "title": "Allocation of Resources Without Limits or Throttling in hMailServer"
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        "title": "CISA ADP Vulnrichment"
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          "product": "Jacamar CI",
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          "lang": "en",
          "value": "Insufficient job validation for service accounts in Jacamar CI prior to v0.30.0 allows authenticated CI users to generate arbitrary account names."
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          "value": "This issue presents a serious risk to all versions of Jacamar CI prior to v0.30.0\nwhen used with GitLab Server v13.11 or later, or with v13.10 when the\n`allow_projects_to_create_service_accounts` feature flag enabled. If you are\nunable to immediately upgrade to the latest release, you can mitigate the risk by\nrestricting the allowed accounts or groups in the configuration, or by using the\nRunAs validation script to check for bot accounts. Please see the release notes for\na complete example."
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      "title": "Authentication Bypass by Spoofing in Jacamar CI"
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          "shortName": "CISA-ADP"
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          "lang": "en",
          "value": "Progressive Robot hMailServer 6.0.0 through 6.3.5 fails open when applying DANE (RFC 7672) to outbound SMTP delivery. The server\u0027s validating DNSSEC resolver treated a TLSA or MX lookup that did not complete (no answer, SERVFAIL, a malformed reply), an answer without the requested records and without an NSEC/NSEC3 proof of their absence, and an answer whose records carried no applicable RRSIG as if the recipient domain were unsigned, and from 6.2.19 it also delivered to mail exchangers taken from an unvalidated MX lookup that the DNSSEC-validated MX record set did not name. An attacker who can drop, forge or strip DNS answers on the path to the server\u0027s resolver, at the resolver, or between the resolver and the recipient domain\u0027s name servers, and who holds an active position on the SMTP path, can thereby disable DANE for a DNSSEC-signed recipient domain and cause messages to be delivered in cleartext or to a host of the attacker\u0027s choosing with an arbitrary certificate, where they can be read and modified."
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          "value": "Upgrade to hMailServer 6.3.6, which treats an incomplete, unsigned or unproven DNSSEC answer for a TLSA or MX lookup under a signed zone as indeterminate, does not use a mail exchanger whose lookup was indeterminate, defers the delivery when none is left, delivers only to mail exchangers named by a DNSSEC-validated MX record set, and (for a host whose DNS servers are IPv6 only) asks those IPv6 servers. Until then, for each recipient domain whose mail must be protected, an SMTP route that names its mail exchangers with the connection security \u0027STARTTLS (required)\u0027, with remote certificate verification on (VerifyRemoteSslCertificate=1), prevents delivery in cleartext or to another host for that domain; and the server\u0027s DNS resolver should be one reached over a trusted path, such as a validating resolver on the same host."
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          "value": "Upgrade to hMailServer 6.3.6, in which the route reads a message\u0027s HTML once to find the images it names and once to write them, and writes at most 24 MB of inlined images in all, every reference counted. Until then: lower the maximum message size, which bounds the cost (it grows with the square of the HTML\u0027s size); leave the webmail\u0027s offline store off so that only an opened message triggers it; or keep the REST listener off (RestApiPort 0, the default)."
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      "title": "Inefficient Algorithmic Complexity in hMailServer"
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    "assignerOrgId": "ceab7361-8a18-47b1-92ba-4d7d25f6715a",
    "assignerShortName": "GitLab",
    "cveId": "CVE-2026-82973",
    "datePublished": "2026-09-29T12:11:12.111Z",
    "dateReserved": "2026-08-31T14:31:02.749Z",
    "dateUpdated": "2026-09-29T14:35:12.368Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}