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Third-party risk is the security exposure introduced by vendors, partners, and supply-chain providers whose breaches or compromises can transit into the buyer’s environment. Common vectors include vendor data breaches, supply-chain attacks that compromise software updates, and dependency compromise in open-source libraries. TacitRed monitors third-party domains and their compromise indicators as part of its broader EASM coverage.
The third-party surface has grown larger than the first-party surface for most enterprises. A typical mid-market company has hundreds of vendors with some level of access to data or systems. A breach at any of those vendors becomes a potential breach for the buyer. Notable supply-chain incidents in 2020 through 2025 demonstrated that the buyer’s controls do not prevent third-party impact.
Third-party risk programs have shifted from annual questionnaires to continuous monitoring. The questionnaire still exists but is supplemented with external compromise indicators, surface monitoring, and identity intelligence on the vendor.
It is a subset of EASM applied to vendors and partners rather than to the buyer’s own infrastructure. Identity intelligence contributes when vendor employee credentials become indicators of vendor compromise.
A bank’s payment processor begins showing compromised-host indicators in TacitRed. The bank’s third-party risk team receives the alert, confirms the indicators with the processor’s security team, and limits transaction throughput until containment is verified. A second example: a logistics company’s CRM vendor appears in a fresh credential leak; the buyer enforces session re-authentication on the vendor’s integration before the credentials can be misused.
By monitoring the same compromise and exposure indicators across the customer’s vendor list as it does for the customer’s own assets. The vendor’s external surface is visible to TacitRed at internet scale.
No. Questionnaires capture policy and posture. TacitRed captures live exposure. They are complementary inputs to a third-party risk program.
TacitRed observes from the public internet, similar to how a vendor’s website is observable. No vendor consent or installation is required for external visibility.
Typically through their existing vendor management workflow: escalation to the vendor, contractual leverage, and selective access controls until the issue is resolved.
Last updated: 2026-05-20.
