Unauthenticated address-book modification via disabled web authentication
Published Aug 3, 2026 · Updated Aug 3, 2026
Insecure default authentication in Sharp and Toshiba Tec MFPs allows remote attackers to read and write address-book data over a network. The initial configuration leaves device-web authentication disabled, exposing address-book and Document Filing functions without a login. Exploitation requires network access to an affected non-Japanese-market MFP that retains this setting; documented effects are data access and modification, not a service interrupt.
Summary
What happened
Insecure default authentication in Sharp and Toshiba Tec MFPs allows remote attackers to read and write address-book data over a network. The initial configuration leaves device-web authentication disabled, exposing address-book and Document Filing functions without a login. Exploitation requires network access to an affected non-Japanese-market MFP that retains this setting; documented effects are data access and modification, not a service interrupt.
The record
- CVE
- CVE-2026-63563
- Published
- Aug 3, 2026
- Updated
- Aug 3, 2026
- Vendor
- Toshiba Tec Corporation
- Product
- Toshiba Tec MFPs
- Classifications
- CWE-1188, T1210
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 3, 2026CVE publishedPublication date reported by the CVE source.
- Aug 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=see the information provided by Toshiba Tec
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Unauthenticated Address Book Modification on Sharp MX/BP Multifunction Printersfunctional · demonstrated
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Technologies
Your stack
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Your stack
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