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Vulnerability details: VCID-9unx-nbx3-4ub9
Vulnerability ID VCID-9unx-nbx3-4ub9
Aliases CVE-2025-62595
GHSA-g8mr-fgfg-5qpc
Summary Koa Vulnerable to Open Redirect via Trailing Double-Slash (//) in back Redirect Logic A bypass was discovered in the `Koa.js` framework affecting its back redirect functionality. In certain circumstances, an attacker can manipulate the Referer header to force a user’s browser to navigate to an external, potentially malicious website. This occurs because the implementation incorrectly treats some specially crafted URLs as safe relative paths. Exploiting this vulnerability could allow attackers to perform phishing, social engineering, or other redirect-based attacks on users of affected applications. This vulnerability affects the code referenced in GitHub Advisory GHSA-jgmv-j7ww-jx2x (which is tracked as CVE‑2025‑54420).
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
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
cvssv3 4.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-62595.json
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2025-62595
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2025-62595
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2025-62595
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2025-62595
epss 0.00018 https://api.first.org/data/v1/epss?cve=CVE-2025-62595
cvssv3.1 4.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-g8mr-fgfg-5qpc
cvssv3.1 4.7 https://github.com/koajs/koa
generic_textual MODERATE https://github.com/koajs/koa
cvssv3.1 4.3 https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
cvssv3.1 4.7 https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
generic_textual MODERATE https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
ssvc Track https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
cvssv3.1 4.3 https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
cvssv3.1 4.7 https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
cvssv3.1_qr MODERATE https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
generic_textual MODERATE https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
ssvc Track https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
cvssv3.1 4.7 https://nvd.nist.gov/vuln/detail/CVE-2025-62595
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2025-62595
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-62595.json
https://api.first.org/data/v1/epss?cve=CVE-2025-62595
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://github.com/koajs/koa
https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
2405387 https://bugzilla.redhat.com/show_bug.cgi?id=2405387
CVE-2025-62595 https://nvd.nist.gov/vuln/detail/CVE-2025-62595
GHSA-g8mr-fgfg-5qpc https://github.com/advisories/GHSA-g8mr-fgfg-5qpc
GHSA-g8mr-fgfg-5qpc https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-62595.json
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

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none

required

unchanged

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none

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low

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
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

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low

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none

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N Found at https://github.com/koajs/koa
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

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Found at https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
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

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low

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Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N Found at https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
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

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high

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none

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Vector: SSVCv2/E:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-10-21T16:35:45Z/ Found at https://github.com/koajs/koa/commit/769fd75cc6b30d72493b370b5a3ae2332ca03c5b
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N Found at https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
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

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none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N Found at https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
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:P/A:N/T:P/P:M/B:A/M:M/D:T/2025-10-21T16:35:45Z/ Found at https://github.com/koajs/koa/security/advisories/GHSA-g8mr-fgfg-5qpc
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2025-62595
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

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low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.04856
EPSS Score 0.00018
Published At June 5, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-02T04:48:12.580229+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/npm/koa/CVE-2025-62595.yml 38.6.0