saga-u.ac.jp

The Cyber Exposure Score is a published 0–100 formula built only from publicly observable signals. How this is calculated.

This domain scores better than 1% of the 112 Education organisations we track (cohort median 78). The sample is seeded from public incident data, not a random cross-section of the sector.

Trend: Exposure down 27 since 2026-10-17 (30 days).

Posture summary

Ransomware leak-site listings (1)

This domain is named on the public leak site of a ransomware group. A leak-site post is a claim published by the group — not a verified fact, and not a statement by this organization. Groups list victims who did not pay, overstate what they hold, and occasionally name the wrong company. What is certain is that the listing itself is public.

Leak-site postings are collected here from 2026-07-30 onwards; an earlier listing would not appear above.

Source: Ransomware.live

Public attack surface (366 hostnames in Certificate Transparency)

Hostnames this organization published in public TLS certificates. Passive OSINT — nothing was scanned; a wildcard certificate is in use, so the real footprint may be larger.

From the names alone: 26 remote access or sign-in, 43 admin tools, 1 non-production.

The hostname inventory — which forgotten hosts exist and where — is part of the complete audit for this domain.

Recommendations

• highEnforce DMARC

  No enforcing DMARC policy was observed. Publish a DMARC record and move to p=quarantine then p=reject to reduce spoofing.

• highPublish SPF

  No SPF record was observed. Publish one listing authorized senders.

• mediumEnable DKIM

  No DKIM record was found on common selectors. Enable DKIM signing.

• mediumEnable DNSSEC

  DNSSEC signing was not detected for this domain.

• criticalPatch known-exploited vulnerabilities

  1 known-exploited vulnerability(ies) may affect exposed services. Prioritize patching.

• criticalPatch what already has a public exploit

  1 vulnerability(ies) reported on this host have working exploit code published (Exploit-DB, Metasploit, Nuclei or a public PoC). Exploitation needs no development effort — patch these first.

• criticalTreat data published on a leak site as disclosed

  This domain is named on thegentlemen's public leak site on 2026-10-16. A leak-site post is a claim published by the group, not a verified fact — but the post itself is public, and if it is accurate the data is already out. Confirm the claim, then work from the assumption of disclosure: rotate every credential that touched the affected systems, invalidate active sessions, and check your notification duties under GDPR Art. 33/34.

• mediumReview the public subdomain footprint

  366 hostnames for this domain appear in public Certificate Transparency logs. Retire forgotten hosts — stale subdomains are a common entry point and a takeover risk.

• highGet a full security audit

  Multiple exposures were detected. A professional audit can prioritize remediation.