- Date
- 21 Sep 2026
- Place
- Japan
- Who
- Gyazo
- The way in
- Known software flaw
- Source
- Infosecurity Magazine
What was reported.
Image-sharing service Gyazo suffered a major data breach after attackers exploited a vulnerability in an upload server. The incident exposed nearly 24 million customer records along with approximately 490 million image metadata records.
The way in the source reports: a known flaw in software the victim ran.
The breach at Gyazo, disclosed on September 11, exposed nearly 24 million customer records after attackers exploited a vulnerability in an upload server.Infosecurity Magazine, added to these pages on 28 Sep 2026. The source
What a known software flaw is.
A known software flaw is a weakness the maker has published and fixed in a later version. A system still on the older version keeps the weakness until it is updated.
Once a flaw is public, attackers look across the internet for the version that has it and try the published method on every system that answers. Devices at the edge of a network, mail servers and web software are reached first because they face the internet.
We read the versions a firm's own servers and website state about themselves and match them to public records of known flaws, the government list of flaws used in attacks among them.
A version a server does not state cannot be read. A fix can also be applied without changing the version shown. A match is a reason to check the system. It is not proof the flaw was used.
This part is true of every case of this kind. It says nothing more about Gyazo than the source does.
What we check for it.
Software versions your site advertises and known flaws in them.
What we read for technology companies.
- The records that tell inboxes whether to refuse email sent as you (DMARC, SPF and DKIM).
- Breach records for addresses at your own domain.
- Names made from yours, each asked whether it is registered and set up for mail.
- The certificate your website answers with: its name, its dates and who issued it.
- The headers and cookies your website sends to every visitor.
- Common addresses for configuration files, code folders and cloud storage.
The rule, from its source: What does each US state's data breach law ask a business to do?
See your own firm the way an attacker reads it.
We read your domain from public records and show each way in with a check anyone can re-run.
Source.
Source: Infosecurity Magazine ↗This page repeats what the source reported, with its date. It says nothing about any firm that is not named in it.