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CVE-2026-54203 is an unauthenticated memory-disclosure vulnerability in Tobit Laboratories AG TeamDavid Webbox. Requests to the Webbox MTA-STS handler for a non-existent MTA-STS file can cause processing to continue after the file-read operation is skipped, returning data from an uninitialized heap buffer in an HTTP response. Repeated requests can disclose residual process memory, including mailbox access-control data, credentials, email content, attachments, configuration data, and other sensitive information. TeamDavid versions before Rollout 528 are affected.
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No public exploit code observed for this vulnerability.
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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.
An unauthenticated memory-leak vulnerability in Tobit Laboratories AG TeamDavid Webbox. Repeated requests to the /.well-known/mta-sts. endpoint can expose process memory containing sensitive information, including user passwords. Affects TeamDavid through Rollout 524.
An unauthenticated information disclosure vulnerability in Tobit Laboratories AG TeamDavid Webbox that leaks process memory via the /.well-known/mta-sts. endpoint, potentially exposing sensitive information including user passwords.
An unauthenticated memory disclosure vulnerability in TeamDavid's /.well-known/mta-sts. handler that returns uninitialized heap memory, leaking sensitive data such as credentials, attachments, configuration files, and SQL queries.
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.