{"id":969,"date":"2026-05-19T10:58:12","date_gmt":"2026-05-19T10:58:12","guid":{"rendered":"https:\/\/thedigitalfortress.us\/?p=969"},"modified":"2026-05-19T10:58:12","modified_gmt":"2026-05-19T10:58:12","slug":"seppmail-secure-e-mail-gateway-vulnerabilities-enable-rce-and-mail-traffic-access","status":"publish","type":"post","link":"https:\/\/thedigitalfortress.us\/?p=969","title":{"rendered":"SEPPMail Secure E-Mail Gateway Vulnerabilities Enable RCE and Mail Traffic Access"},"content":{"rendered":"<div>\n<p><span class=\"p-author\"><i class=\"icon-font icon-user\">\ue804<\/i><span class=\"author\">Ravie Lakshmanan<\/span><i class=\"icon-font icon-calendar\">\ue802<\/i><span class=\"author\">May 19, 2026<\/span><\/span><span class=\"p-tags\">Vulnerability \/ Email Security<\/span><\/p>\n<\/div>\n<div id=\"articlebody\">\n<div class=\"separator\" style=\"clear: both;\"><a href=\"https:\/\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEiortK4EUp9FwJsfVYW-j20LfpbM5qMNelk5-T8BbZ7dEcmBLXnqhWW9loE8GD6aexZv3h-xHEgn_N7ECjV8KXdcGwNxsbhCPP07COzt9c8BhMaVTF4OaSnKD2b98mJjsU1d57OXj2FQtOhKyeo6oPcT0-rrOi-_dKf1iielQQnhsprZ43tHyYFbiYhgFK8\/s1700-e365\/email-hacking.jpg\" style=\"clear: left; display: block; float: left;  text-align: center;\"><\/a><\/div>\n<p>Critical security vulnerabilities have been disclosed in <a href=\"https:\/\/www.seppmail.com\/products\/secure-email-gateway\/\">SEPPMail Secure E-Mail Gateway<\/a>, an enterprise-grade email security solution, that could be exploited to achieve remote code execution and enable an attacker to read arbitrary mails from the virtual appliance.<\/p>\n<p>\u00abThese vulnerabilities could have been exploited to read all mail traffic or as an entry vector into the internal network,\u00bb InfoGuard Labs researchers Dario Weiss, Manuel Feifel, and Olivier Becker <a href=\"https:\/\/labs.infoguard.ch\/posts\/seppmail_secure_e-mail_gateway_rce_vulnerabilities_cve-2026-2743_cve-2026-7864_cve-2026-44127_cve-2026-44128\/\">said<\/a> in a Monday report.<\/p>\n<p>The list of identified flaws is as follows &#8211;<\/p>\n<ul>\n<li><strong><a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-2743\">CVE-2026-2743<\/a><\/strong> (CVSS score: 10.0) &#8211; A path traversal vulnerability in the SeppMail User Web Interface&#8217;s large file transfer (LFT) feature that could enable arbitrary file write, resulting in remote code execution.<\/li>\n<li><strong><a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-7864\">CVE-2026-7864<\/a><\/strong> (CVSS score: 6.9) &#8211; An exposure of sensitive system information vulnerability that leaks server environment variables through an unauthenticated endpoint in the new GINA UI.<\/li>\n<li><strong><a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-44125\">CVE-2026-44125<\/a><\/strong> (CVSS score: 9.3) &#8211; A missing authorization check vulnerability for multiple endpoints in the new GINA UI that allows unauthenticated remote attackers to access functionality that would otherwise require a valid session.<\/li>\n<li><strong><a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-44126\">CVE-2026-44126<\/a><\/strong> (CVSS score: 9.2) &#8211; A deserialization of untrusted data vulnerability that allows unauthenticated remote attackers to execute code via a crafted serialized object.<\/li>\n<li><strong><a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-44127\">CVE-2026-44127<\/a><\/strong> (CVSS score: 8.8) &#8211; An unauthenticated path traversal vulnerability in \u00ab\/api.app\/attachment\/preview\u00bb that allows remote attackers to read arbitrary local files and trigger deletion of files in the targeted directory with the privileges of the \u00abapi.app\u00bb process.<\/li>\n<li><strong><a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-44128\">CVE-2026-44128<\/a><\/strong> (CVSS score: 9.3) &#8211; An eval injection vulnerability that allows unauthenticated remote code execution by taking advantage of the fact that the \/api.app\/template feature directly passes user-supplied upldd parameter into a Perl eval() statement without any sanitization.<\/li>\n<li><strong><a href=\"https:\/\/www.cve.org\/CVERecord?id=CVE-2026-44129\">CVE-2026-44129<\/a><\/strong> (CVSS score: 8.3) &#8211; An improper neutralization of special elements used in a template engine vulnerability that allows remote attackers to execute arbitrary template expressions and potentially achieve remote code execution depending on the enabled template plugins.<\/li>\n<\/ul>\n<div class=\"dog_two clear\">\n<div class=\"cf\"><a href=\"https:\/\/thehackernews.uk\/threatlabz-vpn-risk-2026-d\" rel=\"nofollow noopener sponsored\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\" alt=\"Cybersecurity\" src=\"https:\/\/blogger.googleusercontent.com\/img\/b\/R29vZ2xl\/AVvXsEhnNON5UeWywT7OcPNw7V4L7QNWnCnm7Xl_99Y9ek8dL-gRwx-bWxQM1TKqt8deqqrdpUyKMuuijAWyyPQVB0s0qf8ntQ6ldFAJLru-QUWhddKTopc7SeNbBBnd-TsfFyRPP-AAyDuclLlL6XHK4_LXqDC_7eyaz9pzToYr7U543MhrJ7qcK-89sVWHTQUZ\/s728-e100\/zz-2-d.jpg\" width=\"729\" height=\"91\"\/><\/a><\/div>\n<\/div>\n<p>In a hypothetical attack scenario, a threat actor could exploit CVE-2026-2743 to overwrite the system&#8217;s syslog configuration (\u00ab\/etc\/syslog.conf\u00bb) by making use of the \u00abnobody\u00bb user&#8217;s write access to the file and ultimately obtain a Perl-based reverse shell. The end result is a complete takeover of the SEPPmail appliance, permitting the attacker to read all mail traffic and persist indefinitely on the gateway.<\/p>\n<p>One significant hurdle that an attacker must overcome to achieve remote code execution is that <a href=\"https:\/\/linux.die.net\/man\/8\/syslogd\">syslogd<\/a> re-reads the configuration only upon receiving the <a href=\"https:\/\/en.wikipedia.org\/wiki\/SIGHUP\">SIGHUP<\/a> (aka \u00absignal hang up\u00bb) signal. Syslogd is a Linux system daemon responsible for writing system messages to log files or a user&#8217;s terminal.<\/p>\n<p>\u00abThe appliance uses newsyslog for log rotation (e.g., leading to logfile.0), which runs every 15 minutes via cron,\u00bb the researchers explained. \u00abnewsyslog rotates files that exceed a size limit and then automatically sends a SIGHUP to syslogd. By bloating log files like SEPPMaillog, which has a 10,000 KB limit in this case, we can force a rotation and a subsequent config reload. These can be filled by just sending web requests.\u00bb<\/p>\n<p>While CVE-2026-44128 is said to have been <a href=\"https:\/\/downloads.seppmail.com\/extrelnotes\/150\/ERN15.0.html\">fixed<\/a> by version 15.0.2.1, CVE-2026-44126 was addressed with the release of version 15.0.3. The remaining vulnerabilities have been patched in version 15.0.4.<\/p>\n<p>The disclosure comes weeks after SEPPmail shipped updates to resolve another critical flaw (<a href=\"https:\/\/www.cve.org\/cverecord?id=CVE-2026-27441\">CVE-2026-27441<\/a>, CVSS score: 9.5) that could allow arbitrary operating system command execution.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>\ue804Ravie Lakshmanan\ue802May 19, 2026Vulnerability \/ Email Security Critical security vulnerabilities have been disclosed in SEPPMail Secure E-Mail Gateway, an enterprise-grade email security solution, that could be exploited to achieve remote&hellip;<\/p>\n","protected":false},"author":1,"featured_media":970,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[130,954,369,1722,1723,316,1445,1721,1267,474],"class_list":["post-969","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-access","tag-email","tag-enable","tag-gateway","tag-mail","tag-rce","tag-secure","tag-seppmail","tag-traffic","tag-vulnerabilities"],"_links":{"self":[{"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=\/wp\/v2\/posts\/969","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=969"}],"version-history":[{"count":0,"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=\/wp\/v2\/posts\/969\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=\/wp\/v2\/media\/970"}],"wp:attachment":[{"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=969"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=969"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/thedigitalfortress.us\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=969"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}