What’s Vulnerable › Vulnerabilities

CVE-2025-53528: Cadwyn is vulnerable to an XSS attack through its docs page

• Severity: high (CVSS 7.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-21 · updated 2026-06-17
• Weakness: CWE-79

Description

Cadwyn creates production-ready community-driven modern Stripe-like API versioning in FastAPI. In versions before 5.4.3, the version parameter of the "/docs" endpoint is vulnerable to a Reflected XSS (Cross-Site Scripting) attack. This XSS would notably allow an attacker to execute JavaScript code on a user's session for any application based on Cadwyn via a one-click attack. The vulnerability has been fixed in version 5.4.3.

Affected products

• zmievsa cadwyn: before 5.4.3

References

• https://github.com/zmievsa/cadwyn/commit/b424ecd57cd8dabbc8fe39b8f8ccafea629c7728
• https://github.com/zmievsa/cadwyn/security/advisories/GHSA-2gxp-6r36-m97r

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