CVE-2025-59028 | Open-Xchange OX Dovecot Pro up to 2.4.0/3.1.0 improper authentication (adv-2026-0001)

VDB-353846 · CVE-2025-59028 · ADV-2026-0001 OPEN-XCHANGE OX DOVECOT PRO UP TO 2.4.0/3.1.0 IMPROPER AUTHENTICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.2 $0-$5k 2.52+ Summaryinfo A vulnerability labeled as critical has been found in Open-Xchange OX Dovecot Pro up to 2.4.0/3.1.0. This impacts an unknown function. Such manipulation leads to improper authentication. This vulnerability is documented as CVE-2025-59028. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded. Detailsinfo A vulnerability, which was classified as critical, has been found in Open-Xchange OX Dovecot Pro up to 2.4.0/3.1.0. Affected by this issue is an unknown part. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is availability. CVE summarizes: When sending invalid base64 SASL data, login process is disconnected from the auth server, causing all active authentication sessions to fail. Invalid BASE64 data can be used to DoS a vulnerable server to break concurrent logins. Install fixed version or disable concurrency in login processes (heavy perfomance penalty on large deployments). No publicly available exploits are known. The advisory is available at documentation.open-xchange.com. This vulnerability is handled as CVE-2025-59028 since 09/08/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. The technical details are unknown and an exploit is not available. Upgrading eliminates this vulnerability. Productinfo Type Mail Server Software Vendor Open-Xchange Name OX Dovecot Pro Version 2.0 2.1 2.2 2.3 2.4.0 3.0 3.1.0 License open-source Website Vendor: https://www.open-xchange.com/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 5.3 VulDB Meta Temp Score: 5.2 VulDB Base Score: 5.3 VulDB Temp Score: 5.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 5.3 CNA Vector: 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Improper authentication CWE: CWE-287 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Timelineinfo 09/08/2025 CVE reserved 03/27/2026 +200 days Advisory disclosed 03/27/2026 +0 days VulDB entry created 03/27/2026 +0 days VulDB entry last update Sourcesinfo Vendor: open-xchange.com Advisory: adv-2026-0001 Status: Confirmed CVE: CVE-2025-59028 (🔒) GCVE (CVE): GCVE-0-2025-59028 GCVE (VulDB): GCVE-100-353846 Entryinfo Created: 03/27/2026 09:51 Changes: 03/27/2026 09:51 (63) Complete: 🔍 Cache ID: 99:FFE:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸