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Vulnerability details: VCID-y314-jwfh-bqdq
Vulnerability ID VCID-y314-jwfh-bqdq
Aliases CVE-2025-66202
GHSA-whqg-ppgf-wp8c
Summary Astro is a web framework. Versions 5.15.7 and below have a double URL encoding bypass which allows any unauthenticated attacker to bypass path-based authentication checks in Astro middleware, granting unauthorized access to protected routes. While the original CVE-2025-64765 was fixed in v5.15.8, the fix is insufficient as it only decodes once. By using double-encoded URLs, attackers can still bypass authentication and access any route protected by middleware pathname checks. This issue is fixed in version 5.15.8.
Status Published
Exploitability None
Weighted Severity None
Risk None
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-647 Use of Non-Canonical URL Paths for Authorization Decisions
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.00299 https://api.first.org/data/v1/epss?cve=CVE-2025-66202
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-whqg-ppgf-wp8c
cvssv3.1 6.5 https://github.com/withastro/astro
generic_textual MODERATE https://github.com/withastro/astro
cvssv3.1 6.5 https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce
generic_textual MODERATE https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce
ssvc Track https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce
cvssv3.1 6.5 https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794
generic_textual MODERATE https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794
ssvc Track https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794
cvssv3.1 6.5 https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c
cvssv3.1_qr MODERATE https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c
generic_textual MODERATE https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c
ssvc Track https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2025-64765
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2025-64765
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2025-66202
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2025-66202
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2025-66202
https://github.com/withastro/astro
6f800813516b07bbe12c666a92937525fddb58ce https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce
CVE-2025-64765 https://nvd.nist.gov/vuln/detail/CVE-2025-64765
CVE-2025-66202 https://nvd.nist.gov/vuln/detail/CVE-2025-66202
GHSA-ggxq-hp9w-j794 https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794
GHSA-whqg-ppgf-wp8c https://github.com/advisories/GHSA-whqg-ppgf-wp8c
GHSA-whqg-ppgf-wp8c https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://github.com/withastro/astro
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-12-09T14:18:21Z/ Found at https://github.com/withastro/astro/commit/6f800813516b07bbe12c666a92937525fddb58ce
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-12-09T14:18:21Z/ Found at https://github.com/withastro/astro/security/advisories/GHSA-ggxq-hp9w-j794
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2025-12-09T14:18:21Z/ Found at https://github.com/withastro/astro/security/advisories/GHSA-whqg-ppgf-wp8c
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2025-64765
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2025-66202
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.53643
EPSS Score 0.00299
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:59:45.562990+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2025/66xxx/CVE-2025-66202.json 38.6.0