A single XSS can kill your startup

Short summary

A security audit discovered critical vulnerabilities in a Tool version management system: unvalidated URLs enabling supply-chain attacks, stored XSS in release notes affecting all clients simultaneously, and rate-limited tokens enabling brute-force attacks. For startups with enterprise customers, these vulnerabilities could escalate into existential security incidents. The post provides concrete code examples and practical 10-minute fixes while emphasizing that most developers lack security-focused code review skills.

• •Unvalidated URL fields in auto-update endpoints create XSS/SSRF and supply-chain attack vectors
• •Stored XSS in release notes can compromise all clients simultaneously via database injection
• •Static tokens without rate limiting enable attackers to publish malicious updates

Generated with AI, which can make mistakes.