These pages are published after PatchSiren validates generated defensive summaries against stored public CVE and source evidence.
An attacker holding a token intended for a different purpose can authenticate due to improper scope validation. When an OAuth2 token response lacks a scope claim, the audience claim is used instead and checked against configured required scopes. This can lead to unauthorized access if a token with no relevant permissions has an intended recipient value matching a configured scope name. Additionally, it ca [truncated]
An attacker with valid credentials can cause a denial of service by selecting a compression algorithm for an IMAP connection that requires a large amount of memory. This can be mitigated by disabling IMAP compression, limiting the number of connections handled by a single imap-login process, or updating to a non-vulnerable version. The vulnerability affects IMAP service configurations and users with valid [truncated]
The CVE-2026-42007 record indicates a critical vulnerability in an unspecified product, potentially affecting mail delivery processes. An attacker with valid credentials can use a Sieve script with the editheader extension to trigger a use-after-free in the mail editing code, potentially allowing execution of arbitrary code in the context of the delivery process. System administrators responsible for mail [truncated]
The CVE-2026-40205 vulnerability allows an attacker with an OAuth2 token that has only part of the required scopes to authenticate. This occurs because the remote token validation paths accept a token with only one of the required scopes when multiple scopes are configured, while the local token validation path correctly requires all of them. As a result, the configured authorization policy is not enforce [truncated]
The CVE-2026-40204 vulnerability is a LOW-severity issue with a CVSS score of 3.1. It was published on 2026-08-28T12:16:29.023Z and has not been modified since then. Security teams with potential exposures to Open Xchange products should review vendor claims and verify affected product lists. Limited details are available on affected products and versions. The CVE Program and NVD provide official records, [truncated]
AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-28T12:16:28.897Z and has not been modified since then. CVE-2026-40203 is a low-severity vulnerability in IMAP compression. When IMAP compression is enabled, the same compression state is reused across responses in a session, allowing an attacker to confirm whether the body of a small message matches [truncated]
An unauthenticated attacker can send a truncated quoted argument to the ManageSieve login process, causing an infinite loop that consumes CPU, leading to degradation or denial of service for Sieve script management. Repeated connections can consume all available CPU on the server. This issue has a CVSS score of 5.9 and is classified as MEDIUM severity. The vulnerability can be mitigated by monitoring syst [truncated]
CVE-2026-40013 is a vulnerability in the ManageSieve service of an affected product. An attacker with valid credentials can submit a malicious Sieve script, causing an out-of-bounds write and memory corruption, leading to a denial of service. The vulnerability has a CVSS score of 4.3 and a severity of MEDIUM. There are no known publicly available exploits. Administrators and users who rely on the ManageSi [truncated]
An attacker with valid credentials can use the IMAP LIST command to consume CPU, causing degradation or denial of service for IMAP. This issue affects IMAP servers, and defenders should focus on monitoring system performance and applying patches promptly. The vulnerability has a CVSS score of 4.3 and a severity of MEDIUM. Limited source detail suggests validating IMAP server configurations and monitoring [truncated]
Mail content stored by a user can be crafted so that it is interpreted as dsync protocol commands when an administrator later runs dsync with the stream protocol, for example during a migration. Injected commands can modify mailbox state on the destination during migration or replication, including internal mailbox attributes that a user should not be able to set directly. It can also cause dsync errors. [truncated]
The CVE-2026-33604 vulnerability allows an attacker to bypass outbound protections in Dovecot, potentially leading to spoofed email injection, by using a crafted line ending in the message body. This issue is related to CVE-2023-51764 and CVE-2023-51766. The vulnerability affects Dovecot configurations and can be mitigated by updating to non-vulnerable versions and ensuring downstream mail servers reject [truncated]
The CVE-2026-33263 vulnerability occurs in the submission-login process of an affected product, leading to a crash with an epoll() panic due to file descriptor handling issues when the mail_max_userip_connections setting is reached. This can cause failures in sending messages or duplicate messages being sent. The crashes can be mitigated by limiting the number of connections handled by a single submission [truncated]
CVE-2026-42006 is a medium-severity vulnerability in Dovecot's IMAP implementation, published 2026-05-12 and modified 2026-05-18. The issue represents an incomplete fix for CVE-2026-27857, where excessive brace characters in IMAP commands could trigger uncontrolled memory consumption. The original remediation only addressed closing braces, leaving open braces as an attack vector. An authenticated attacker [truncated]
CVE-2026-40020 is a LOW-severity vulnerability (CVSS 3.1) in Dovecot affecting versions prior to 2.4.4 and Dovecot Pro prior to 3.1.5. Published 2026-05-12 and last modified 2026-05-18, this issue allows an authenticated attacker with IMAP access to inject the 'anyone' permission into a user's dovecot-acl file via the SETACL command, even when the imap_acl_allow_anyone configuration option is set to no. T [truncated]
CVE-2026-27851 is a HIGH severity vulnerability (CVSS 7.4) in Dovecot affecting versions prior to 2.4.4 and Dovecot Pro prior to 3.1.5. The flaw occurs when the `safe` filter is used with variable expansion, causing all subsequent pipelines on the same string to be incorrectly interpreted as safe. This improper handling enables unsafe data to be unescaped, which can facilitate SQL or LDAP injection attack [truncated]
CVE-2026-27858 is a high-severity vulnerability in Dovecot's managesieve protocol. An attacker can send a specifically crafted message before authentication, causing managesieve to allocate a large amount of memory. This can be used to force managesieve-login to be unavailable by repeatedly crashing the process. To mitigate this vulnerability, access to the managesieve protocol should be protected, or a f [truncated]
A vulnerability in OX Dovecot Pro allows an attacker to cause a denial of service (DoS) by sending invalid base64 SASL data, which can disconnect the login process from the auth server and fail all active authentication sessions. To mitigate this vulnerability, it is recommended to install a fixed version or disable concurrency in login processes, although this may result in a heavy performance penalty on [truncated]
