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CVE-2026-8496 is a cross-site scripting vulnerability in Alinto SOGo affecting version 5.12.7. The flaw is triggered when SOGo processes and renders a malicious ICS calendar invitation in the webmail interface. Specifically, content placed in the ICS DESCRIPTION field can include embedded SVG markup with an event handler such as onrepeat, and that content is insufficiently sanitized before being rendered in the authenticated user's browser. Available reporting also indicates the issue is compounded by inadequate Content Security Policy enforcement. When the victim views the crafted calendar invite, attacker-supplied JavaScript executes in the security context of the SOGo webmail session.
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What an attacker gets, and what they’ve been doing with it.
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No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A zero-day vulnerability in SOGo webmail exploited by TA458 as part of Operation RoundPress using half-click webmail exploitation to steal sensitive email data.
A zero-day vulnerability affecting the SOGo webmail platform that was exploited as part of Operation RoundPress and later patched in version 5.12.8.
A SOGo webmail vulnerability identified as the most recent zero-day used by TA458.
A zero-day cross-site scripting vulnerability in the SOGo webmail platform used by TA458 as a half-click exploit to compromise users when they open a malicious email in the webmail viewer.
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.