An issue was discovered in Datalust Seq before 2024.3.13545. Missing Content-Type validation can lead to CSRF when (1) Entra ID or OpenID Connect authentication is in use and a user visits a compromised/malicious site, or (2) when username/password or Active Directory authentication is in use and a user visits a compromised/malicious site under the same effective top-level domain as the Seq server. Exploitation of the vulnerability allows the attacker to conduct impersonation attacks and perform actions in Seq on behalf of the targeted user.

An issue was discovered in Datalust Seq before 2024.3.13545. Expansion of identifiers in message templates can be used to bypass the system "Event body limit bytes" setting, leading to increased resource consumption. With sufficiently large events, there can be disk space exhaustion (if saved to disk) or a termination of the server process with an out-of-memory error.

An issue was discovered in Datalust Seq before 2024.3.13545. An insecure default parsing depth limit allows stack consumption when parsing user-supplied queries containing deeply nested expressions.

Datalust Seq before 2023.4.11151 and 2024 before 2024.1.11146 has Incorrect Access Control because a Project Owner or Organization Owner can escalate to System privileges.

Datalust Seq before 2023.2.9489 allows insertion of sensitive information into an externally accessible file or directory. This is exploitable only when external (SQL Server or PostgreSQL) metadata storage is used. Exploitation can only occur from a high-privileged user account.

Datalust Seq.App.EmailPlus (aka seq-app-htmlemail) 3.1.0-dev-00148, 3.1.0-dev-00170, and 3.1.0-dev-00176 can use cleartext SMTP on port 25 in some cases where encryption on port 465 was intended.

Datalust Seq before 2021.2.6259 allows users (with view filters applied to their accounts) to see query results not constrained by their view filter. This information exposure, caused by an internal cache key collision, occurs when the user's view filter includes an array or IN clause, and when another user has recently executed an identical query differing only by the array elements.

Datalust Seq before 4.2.605 is vulnerable to Authentication Bypass (with the attacker obtaining admin access) via '"Name":"isauthenticationenabled","Value":false' in an api/settings/setting-isauthenticationenabled PUT request.