High severity7.6OSV Advisory· Published Jul 21, 2025· Updated Jun 17, 2026
CVE-2025-53528
CVE-2025-53528
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
cadwynPyPI | < 5.4.3 | 5.4.3 |
Affected products
2Patches
Vulnerability mechanics
References
6- github.com/advisories/GHSA-2gxp-6r36-m97rghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2025-53528ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/cadwyn/PYSEC-2025-71.yamlghsaWEB
- github.com/zmievsa/cadwyn/blob/5.4.3/CHANGELOG.mdghsaWEB
- github.com/zmievsa/cadwyn/commit/b424ecd57cd8dabbc8fe39b8f8ccafea629c7728nvdWEB
- github.com/zmievsa/cadwyn/security/advisories/GHSA-2gxp-6r36-m97rnvdWEB
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