CVE-2026-29137 | SEPPmail Secure Email Gateway up to 15.0.2 input validation

VDB-354838 · CVE-2026-29137 · GCVE-0-2026-29137 SEPPMAIL SECURE EMAIL GATEWAY UP TO 15.0.2 INPUT VALIDATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.1 $0-$5k 1.35+ Summaryinfo A vulnerability categorized as problematic has been discovered in SEPPmail Secure Email Gateway up to 15.0.2. Affected by this vulnerability is an unknown functionality. Executing a manipulation can lead to input validation. This vulnerability appears as CVE-2026-29137. The attack may be performed from remote. There is no available exploit. It is advisable to upgrade the affected component. Detailsinfo A vulnerability has been found in SEPPmail Secure Email Gateway up to 15.0.2 and classified as problematic. This vulnerability affects an unknown functionality. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect integrity. CVE summarizes: SEPPmail Secure Email Gateway before version 15.0.3 allows an attacker to hide security tags from users by crafting a long subject. The weakness was presented by Andris Suter-Dörig. The advisory is available at downloads.seppmail.com. This vulnerability was named CVE-2026-29137 since 03/04/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. Upgrading to version 15.0.3 eliminates this vulnerability. Productinfo Vendor SEPPmail Name Secure Email Gateway Version 15.0.0 15.0.1 15.0.2 CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 4.3 VulDB Meta Temp Score: 4.1 VulDB Base Score: 4.3 VulDB Temp Score: 4.1 VulDB Vector: 🔒 VulDB Reliability: 🔍 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: Input validation CWE: CWE-20 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: 🔒 Upgrade: Secure Email Gateway 15.0.3 Timelineinfo 03/04/2026 CVE reserved 04/02/2026 +28 days Advisory disclosed 04/02/2026 +0 days VulDB entry created 04/02/2026 +0 days VulDB entry last update Sourcesinfo Advisory: downloads.seppmail.com Researcher: Andris Suter-Dörig Status: Confirmed CVE: CVE-2026-29137 (🔒) GCVE (CVE): GCVE-0-2026-29137 GCVE (VulDB): GCVE-100-354838 Entryinfo Created: 04/02/2026 11:21 Changes: 04/02/2026 11:21 (66) Complete: 🔍 Cache ID: 99:072:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸