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CVE-2023-21715 is a local security feature bypass vulnerability in Microsoft Publisher. It was actively exploited as a zero-day before Microsoft released security updates in February 2023. Storm-0324 used malicious Publisher files containing JavaScript in exploitation chains that delivered JSSLoader and facilitated subsequent access by Sangria Tempest. The specific vulnerable function and security control bypassed are not established.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A local security feature bypass vulnerability reportedly exploited in Storm-0324's phishing delivery chain. A malicious file hosted on SharePoint delivers JSSLoader, establishing access that is subsequently handed to Sangria Tempest for ransomware attacks. The article does not identify the vulnerable product or explain the bypass mechanism.
A local security feature bypass vulnerability referenced as being exploited via Ekipa publisher files in Storm-0324 infection chains to help deliver JSSLoader.
Microsoft Office security feature bypass vulnerability (described as potentially behaving like privilege escalation) that is under active exploitation.
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.