CVE-2026-3112 | Mattermost up to 10.11.11/11.2.3/11.3.1/11.4.0/11.4.x AdvancedLoggingJSON path traversal (EUVD-2026-16238)

VDB-353681 · CVE-2026-3112 · EUVD-2026-16238 MATTERMOST UP TO 10.11.11/11.2.3/11.3.1/11.4.0/11.4.X ADVANCEDLOGGINGJSON PATH TRAVERSAL HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.7 $0-$5k 2.35+ Summaryinfo A vulnerability classified as critical has been found in Mattermost up to 10.11.11/11.2.3/11.3.1/11.4.0/11.4.x. This impacts an unknown function of the component AdvancedLoggingJSON Handler. The manipulation leads to path traversal. This vulnerability is documented as CVE-2026-3112. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component. Detailsinfo A vulnerability was found in Mattermost up to 10.11.11/11.2.3/11.3.1/11.4.0/11.4.x. It has been rated as problematic. This issue affects some unknown processing of the component AdvancedLoggingJSON Handler. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality. The summary by CVE is: Mattermost versions 11.4.x <= 11.4.0, 11.3.x <= 11.3.1, 11.2.x <= 11.2.3, 10.11.x <= 10.11.11 fail to validate Advanced Logging file target paths which allows system administrators to read arbitrary host files via malicious AdvancedLoggingJSON configuration in support packet generation. Mattermost Advisory ID: MMSA-2025-00562 The weakness was released by mufeedvh. The advisory is shared at mattermost.com. The identification of this vulnerability is CVE-2026-3112 since 02/24/2026. The exploitation is known to be easy. The attack may be initiated remotely. The exploitation needs additional levels of successful authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1006 for this issue. Upgrading to version 10.11.12, 11.2.4, 11.3.2, 11.4.1 or 11.5.0 eliminates this vulnerability. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-16238). Productinfo Type Groupware Software Name Mattermost Version 10.11.0 10.11.1 10.11.2 10.11.3 10.11.4 10.11.5 10.11.6 10.11.7 10.11.8 10.11.9 10.11.10 10.11.11 11.0 11.1 11.2 11.2.0 11.2.1 11.2.2 11.2.3 11.3 11.3.0 11.3.1 11.4 11.4.0 License open-source CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 4.7 VulDB Meta Temp Score: 4.7 VulDB Base Score: 2.7 VulDB Temp Score: 2.6 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.8 CNA Vector (Mattermost): 🔒 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: Path traversal CWE: CWE-22 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: Mattermost 10.11.12/11.2.4/11.3.2/11.4.1/11.5.0 Timelineinfo 02/24/2026 CVE reserved 03/26/2026 +30 days Advisory disclosed 03/26/2026 +0 days VulDB entry created 03/26/2026 +0 days VulDB entry last update Sourcesinfo Advisory: mattermost.com Researcher: mufeedvh Status: Confirmed CVE: CVE-2026-3112 (🔒) GCVE (CVE): GCVE-0-2026-3112 GCVE (VulDB): GCVE-100-353681 EUVD: 🔒 Entryinfo Created: 03/26/2026 19:01 Updated: 03/26/2026 19:18 Changes: 03/26/2026 19:01 (65), 03/26/2026 19:18 (1) Complete: 🔍 Cache ID: 99:B61:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸