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CVE-2026-44129 is a server-side template injection (SSTI) vulnerability affecting SEPPmail Secure Email Gateway before version 15.0.4, specifically in the new GINA UI (GINAv2). According to the provided content, an endpoint in the GINA UI accepts an attacker-controlled template and fails to properly neutralize special elements interpreted by the template engine. This allows a remote attacker to inject and execute arbitrary template expressions on the server. Depending on which template engine plugins are enabled in the deployment, successful exploitation may extend beyond template expression evaluation to remote code execution on the underlying appliance.
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A template engine injection flaw that allows arbitrary template expression execution and may lead to remote code execution depending on enabled plugins.
A server-side template injection vulnerability in SEPPMail GINAv2 mentioned in the overview of fixed issues.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.