Astro has an Authentication Bypass via Double URL Encoding, a bypass for CVE-2025-64765

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.0031, the 24th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 8 Dec 2025. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-whqg-ppgf-wp8c
• OSV: GHSA-whqg-ppgf-wp8c
• github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794
• github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c
• nvd.nist.gov/vuln/detail/CVE-2025-64765
• nvd.nist.gov/vuln/detail/CVE-2025-66202
• github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce
• github.com/withastro/astro

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.