OVH 2015 Data Breach

OVH Cloud Hosting Provider Breach (2015): 453K User Accounts Including Passwords Exposed

Company · Cloud computing and hosting services · Infrastructure provider · Global

OVH Cloud Hosting Provider Breach (2015): 453K User Accounts Including Passwords Exposed

Cloud computing and hosting provider.

Confirmed · ObscureIQ Intelligence
Breach Risk Index i
8/100
Lower riskHigher risk
Lower: limited current risk based on data value and recency.
Data Sensitivity i
Standard
Exposed data is largely lower-sensitivity. Standard identity-protection precautions are advised.
453KRecords
2015Year

The Breach Risk Index (BRI) is a proprietary 0–100 score rating how dangerous a breach is right now, based on how recently the data has been circulating on the dark web and how valuable it is to attackers.

Classification Tags
Hosting & InfrastructureHostingUsers2015

Breach Summary

In mid-2015, the vBulletin forum for hosting provider OVH suffered a data breach exposing about 453,000 accounts including usernames, email and IP addresses, and passwords stored as salted MD5 hashes.

Full threat analysis, exploitation vectors, and principal guidance below.

9 additional sections · verified field analysis · defensive doctrine

Querying breach corpus…
Cross-referencing exposed field types…
Resolving threat-actor attribution…
Compiling principal risk advisory…

453K records analyzed

About OVH

OVH (OVHcloud) is a major European cloud and web-hosting provider; the affected system was its community forum.

Why They Hold Your Data

Cloud infrastructure providers collect customer account data, billing records, administrative credentials, support interactions, and metadata tied to hosted servers, domains, and enterprise workloads.

Data Points Exposed

4 verified field types
Email Address
IP Address
Password High
Username

Breach Impact

Salted MD5 is crackable, exposing reused forum credentials; scope is limited to the community forum.

Exploitation & Downstream Threats

• Credential stuffing against reused passwords across other platforms | • Targeted phishing campaigns using exposed email addresses

Principal Risk Advisory

What this means for a principal

A consumer-service breach: contact and account data supports phishing, account takeover and profile enrichment. For a high-profile principal the main risk is credible impersonation and enrichment of existing exposure.

What You Should Do

  1. Reset any reused passwords and enable MFA on email first, then financial accounts.
  2. Do not use unofficial 'am I affected' lookups; several are themselves harvesting operations.

How ObscureIQ Can Help

  1. Corpus confirmation: determine whether and where the principal (plus household and staff) appear in this dataset and which specific fields are exposed for them.
  2. Exposure mapping: cross-reference the exposed identifiers against broker-available data to size and prioritize the principal's wider footprint.
  3. ThreatWatch tuned to this incident's identifiers and misuse pattern (impersonation and targeting patterns, not generic credential monitoring).

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