CVE-2026-63101 is a missing authentication vulnerability in Open Event Server through version 1.19.1. The flaw affects the group followers CSV export workflow, where the export endpoint lacks authentication enforcement, allowing unauthenticated remote attackers to initiate exports of group member rosters. An attacker can enumerate sequential group identifiers, submit requests to the unauthenticated export endpoint, and poll an unauthenticated task status endpoint until the export completes, ultimately obtaining a downloadable CSV containing group membership information. Exposed data includes member names, email addresses, join dates, and roles.
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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.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.