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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 renders a malicious ICS calendar invitation in the webmail interface. SVG content embedded in the ICS description field can include an event handler such as onrepeat that is not sufficiently sanitized before being presented to the user. When an authenticated user views the crafted calendar invite, attacker-controlled JavaScript executes in the context of that user’s SOGo web session. The issue is effectively a stored or content-injection XSS condition in calendar invitation handling within the webmail client.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.