CVE-2026-9495
📛 CVE Title
CVE-2026-9495
Description
Versions of the package @koa/router from 14.0.0 and before 15.0.0 are vulnerable to Access Control Bypass due to the middleware being silently dropped from the execution chain when the router prefix contains path parameters. Depending on what the skipped middleware was supposed to protect, an attacker could bypass authentication and authorization, evade rate limiting or bypass input sanitization.
Overview
- State
- PUBLISHED
- Assigner (CNA)
- snyk
- CVSS severity
- MEDIUM
- CVSS score
- 6.9 / 10
- CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P- Effective score
- 6.9 / 10 MEDIUM source: CNA overview
- CWE(s)
-
CWE-284 - Reserved
- 2026-05-25
- Published
- 2026-05-26 05:00 UTC
- Last updated
- 2026-05-26 12:41 UTC
- Source
- https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/9xxx/CVE-2026-9495.json
- Linked Threat
- CVE-2026-9495 — CVE-2026-9495
NVD triage scoring NVD CVE 2.0
Layer NVD adds on top of the CNA's CVE record — published / last-modified timestamps, exploitability / impact subscores, and the FIRST.org EPSS probability that this CVE will be exploited in the wild in the next 30 days.
- NVD published
- 2026-05-26 07:16:19 UTC
- NVD last modified
- 2026-07-23 11:10:00 UTC
- NVD CVSS v3.1
- 7.3 / 10 HIGH source: report@snyk.io
- NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L- Exploitability subscore
- 3.9 / 10
- Impact subscore
- 3.4 / 10
- EPSS score
- 0.0036 (probability of exploitation in next 30 days)
- EPSS percentile
- 28.57% vs all CVEs — higher = more likely to be exploited, as of 2026-07-27
NVD / KEV / EPSS data refreshed 2026-07-28 06:21 UTC. Re-run the 🛰 Backfill from NVD button above to refresh.
European Union Vulnerability Database ENISA EUVD
ENISA's official EU repository for curated vulnerability intelligence. Carries a separate identifier (EUVD-YYYY-NNNN) and frequently exposes an earlier-published description + CVSS than NVD does.
- EUVD ID
-
EUVD-2026-31792 - Assigner
- snyk
- Published
- May 26, 2026, 5:00:04 AM
- Updated
- May 26, 2026, 12:41:21 PM
- EUVD base score (CVSS 4.0)
-
6.9 / 10
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P - EUVD-reported EPSS
- 0.3600
- Vendors
- n/a
- Products
-
@koa/router (14.0.0 <15.0.0)
- Aliases
-
GHSA-47p6-69vm-vw6v
ENISA description: Versions of the package @koa/router from 14.0.0 and before 15.0.0 are vulnerable to Access Control Bypass due to the middleware being silently dropped from the execution chain when the router prefix contains path parameters. Depending on what the skipped middleware was supposed to protect, an attacker could bypass authentication and authorization, evade rate limiting or bypass input sanitization.
Affected products (1)
| Vendor | Product | Versions | Platforms |
|---|---|---|---|
| n/a | @koa/router |
14.0.0 (affected)
|
— |
Vendor references (4)
References embedded in the original CVE record by the assigning CNA.
Web references (7)
DuckDuckGo results ranked by threat-intel / vendor advisory domains. Generated by the 🔎 Find references (web) button above — same flow as the Remediations search.
- https://github.com/koajs/router/commit/d53e17f284557b1f417946f9807ee52290c3c759 tenable:github.com
- https://github.com/koajs/router/issues/202 tenable:github.com
- https://github.com/koajs/router/pull/206 tenable:github.com
- https://nvd.nist.gov/vuln/detail/CVE-2026-9495 tenable:nvd.nist.gov
- https://security.snyk.io/vuln/SNYK-JS-KOAROUTER-12215044 tenable:security.snyk.io
- https://www.cve.org/CVERecord?id=CVE-2026-9495 tenable:www.cve.org
- https://www.first.org/epss/ tenable:www.first.org
NVD-tagged references (5)
Reference list NVD curates from the CNA record, vendor advisories, and third-party reports. The tag chips below are NVD's analyst-assigned categories.
- https://github.com/koajs/router/commit/d53e17f284557b1f417946f9807ee52290c3c759 report@snyk.io
- https://github.com/koajs/router/issues/202 report@snyk.io
- https://github.com/koajs/router/pull/206 report@snyk.io
- https://github.com/koajs/router/pull/206 134c704f-9b21-4f2e-91b3-4a467353bcc0
- https://security.snyk.io/vuln/SNYK-JS-KOAROUTER-12215044 report@snyk.io
Remediations (18)
Remediations are stored against the linked Threat row; the list below is deduplicated across both pages.
-
web:blog.qualys.com
May 2026's Patch Tuesday arrives with Microsoft addressing a fresh set of vulnerabilities across its ecosystem, reinforcing the ongoing need for timely patching in an increasingly threat-heavy…
2026-06-04 00:05 UTC -
web:cyberinsider.com
The June 2026 fixes are available through security patch levels 2026 -06-01 and 2026 -06-05, with the latter incorporating all fixes from both patch levels. Pixel devices are expected to receive the updates first, while availability for Samsung, Motorola, Xiaomi, OnePlus, and other Android vendors will depend on each manufacturer's release schedule.
2026-06-04 00:05 UTC -
web:cybersecuritynews.com
Microsoft's May 2026 Patch Tuesday lands with a heavy enterprise focus, fixing 120 vulnerabilities across Windows, Office, Azure, developer tools, and Microsoft 365 apps, including 29 remote code execution (RCE) flaws rated Critical.
2026-06-04 00:05 UTC -
web:portal.msrc.microsoft.com
The Security Update Guide provides information on the latest Microsoft security updates, helping users understand and address potential vulnerabilities effectively.
2026-06-04 00:05 UTC -
web:source.android.com
Android partners are encouraged to fix all issues in this bulletin and use the latest security patch level. Devices that use the 2025-03-01 security patch level must include all issues associated with that security patch level, as well as fixes for all issues reported in previous security bulletins.
2026-06-04 00:05 UTC -
web:thecyberexpress.com
Google's June 2026 Android update patches 124 flaws, including exploited zero-day CVE -2025-48595 affecting Android 14, 15 and 16.
2026-06-04 00:05 UTC -
web:thehackernews.com
Google patched 124 Android flaws in June 2026 , including exploited CVE -2025-48595, reducing privilege-escalation risks.
2026-06-04 00:05 UTC -
web:windowsforum.com
Update policies, rollback settings, frozen images, and exception groups should be reviewed after remediation so the next Edge RCE does not find the same stale machines. The broader lesson of CVE - 2026 -45495 is that the browser has become too important to manage casually and too exposed to patch slowly.
2026-06-04 00:05 UTC -
web:www.techrepublic.com
Microsoft's May Patch Tuesday fixes 120 flaws, including 31 remote code execution bugs, with no zero-days reported at release.
2026-06-04 00:05 UTC -
web:zecurit.com
Get the complete breakdown of Microsoft's June 2026 Patch Tuesday. We analyze the latest security updates and all critical CVEs .
2026-06-04 00:05 UTC -
web:blog.talosintelligence.com
Microsoft has released its monthly security update for February 2026 , which includes 55 vulnerabilities affecting a range of products, including one ( CVE -2025-59498) that Microsoft marked as "Critical".
2026-06-19 02:26 UTC -
web:cybersecuritynews.com
Microsoft has released its June 2026 Patch Tuesday security updates, addressing a hefty 198 vulnerabilities across its product ecosystem. The June rollout, published on June 9, 2026 , stands out not only for its volume but also for the inclusion of three zero-day vulnerabilities that were actively exploited or publicly known before a fix was available. Administrators are urged to prioritize ...
2026-06-19 02:26 UTC -
web:msrc.microsoft.com
Security Update Guide - Microsoft Security Response Center
2026-06-19 02:26 UTC -
web:support.sap.com
SAP security Patch Day Bulletin
2026-06-19 02:26 UTC -
web:www.anavem.com
KB5094125 is a June 2026 security update that addresses multiple vulnerabilities in Windows Server 2025, including critical fixes for Active Directory Domain Services and Remote Desktop Services components.
2026-06-19 02:26 UTC -
web:www.computerworld.com
Microsoft says it is considering a patch for a zero-day vulnerability, dubbed YellowKey, that allows attackers with access to a Windows device to bypass Bitlocker encryption protection and read ...
2026-06-19 02:26 UTC -
web:www.malwarebytes.com
Microsoft says it's working on a fix for an unpatched Defender vulnerability that can give attackers the highest level of access on Windows.
2026-06-19 02:26 UTC -
web:www.oracle.com
This Critical Security Patch Update contains 35 new security patches across the product families listed below. Please note that an MOS note summarizing the content of this Critical Security Patch Update and other Oracle Software Security Assurance activities is located at May 2026 Critical Security Patch Update: Executive Summary and Analysis.
2026-06-19 02:26 UTC
AI Forensic Analysis
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Raw JSON
The full cvelistV5 record. Download as CVE-2026-9495.json.
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