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CVE-2026-86055: Part-DB: Password Reset Link Poisoning via Host Header Injection leads to pre-authentication Account Takeover

• Severity: high (CVSS 8.7 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-23 · updated 2026-10-29
• Weakness: CWE-640

Description

Part-DB is an open source inventory management system for electronic components. Prior to version 2.13.3, Part-DB builds the absolute URL of the password-reset link it emails to a user from the client-supplied HTTP Host header, with no trusted-host validation. An unauthenticated attacker who submits a forgot-password request for a known account while sending a spoofed Host header causes Part-DB to email that account a reset link whose hostname is attacker-controlled, while still embedding the genuine reset token. When the victim opens the link (or an automated inbound mail-security scanner dereferences it), the valid token is disclosed to the attacker, who replays it against the real instance to set a new password and take over the account. Because the seeded admin account can be targeted, this yields full pre-authentication administrative account takeover. This issue has been patched in version 2.13.3.

Affected products

• Part-DB-server: before 2.13.3

References

• https://github.com/Part-DB/Part-DB-server/releases/tag/v2.13.3
• https://github.com/Part-DB/Part-DB-server/security/advisories/GHSA-m9rf-69wp-c56r
• https://github.com/Part-DB/Part-DB-server/security/advisories/GHSA-m9rf-69wp-c56r

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