CVE-2026-125389 · Package
NO FIX YET · SEE WHAT TO DO
Group-Office's email viewer filters HTML with a flawed regex, so crafted emails with svg/onload tags are rendered raw. When a recipient opens the email, the attacker's script runs in their Group-Office session.
first public Nov 9, 2026 · 1 source
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Any Group-Office installation with the email viewer enabled is exposed, since a remote sender only needs to get a message to a user who opens it. Installations on versions at or above the listed fixes are not affected. The sources do not say whether non-default configuration is needed.
Not affected if patched-version
Who cares email, group-office, self-hosted
6.8.181, 25.0.116, 26.0.58.6.8.181, 25.0.116, or 26.0.58, matching your release line.Intermesh Group-Office before 6.8.181, 25.0.116, and 26.0.58 contains a stored cross-site scripting vulnerability in the email viewer due to a flawed regex in StringHelper::filterXSS. Remote attackers can send emails containing tags like svg/onload, which MessagePanel.js renders raw, executing script in the recipient's session when opened.
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