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Http Server CVE-2026-61526

| EUVDEUVD-2026-51310 MEDIUM
Cross-site Scripting (XSS) (CWE-79)
2026-07-30 GitHub_M
XSS Http Server Adonisjs
6.1
CVSS 3.1 · Vendor: GitHub_M
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Vulnerability Assessment

Weakness
CWE
CWE-79
OWASP Top 10:2025
A05:2025 - Injection
ASVS 5.0
V1 - Encoding and Sanitization Output encoding, context-aware escaping
MITRE ATT&CK

2 techniques across 2 tactics: Initial Access, Execution

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 30, 2026

Reflected XSS in AdonisJS HTTP Server (versions 8.0.0-next.0 through 8.2.0 and 9.0.0 through 9.0.2) enables remote unauthenticated attackers to execute arbitrary JavaScript in a victim's browser by crafting a malicious 404 URL containing an embedded HTML payload. The framework's default exception handler interpolates the unescaped request path directly into the HTML error response when debug mode is disabled and no custom error handler is configured. No public exploit has been identified at time of analysis, but the fix commit includes a working proof-of-concept test demonstrating a cookie-exfiltration attack using fetch('/dashboard',{credentials:'include'}), confirming practical exploitability.

Affected VersionsENISA

http-server 8.0.0-next.0, < 8.2.1
http-server 9.0.0, < 9.1.0

Affected Packages

euvd http_server_8_0_0_next_0 fix: 8.2.1
euvd http_server_9_0_0 fix: 9.1.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 2 packages in euvd

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Vendor (GitHub_M) PRIMARY 6.1 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Primary rating from Vendor (GitHub_M) · only source for this CVE.

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

1
Patch available
Jul 30, 2026 - 22:20 EUVD

DescriptionCVE.org

AdonisJS HTTP Server is a package for handling HTTP requests in the AdonisJS framework. In versions 8.0.0-next.0 through 8.2.0 and 9.0.0 through 9.0.2, the error.message is interpolated into the default HTML exception response without escaping, allowing a crafted missing-route URL to execute attacker-controlled JavaScript when a victim opens it and no custom status page or JSON response handles the error. When debug mode is disabled and no custom status page handles the error, the default HTML renderer interpolates error.message directly into an HTML response. This issue is fixed in versions 8.2.1 and 9.1.0.

Threat Intelligence Overview

EPSS Score
0.2%
Top 91% exploitable
Data Quality
6 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation
None
System Exposure· derived
Open
Automatable
No
Human Impact· derived
Medium
Technical Impact
Partial

Priority Score

30
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +30
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Cross-Site Scripting MEDIUM

Cross-Site Scripting occurs when an application accepts untrusted data and sends it to a web browser without proper validation or encoding.

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References

Advisories & patches
ADVISORY https://vuldb.com/vuln/384943 REF https://github.com/adonisjs/http-server/commit/5d7465d599753b1fce8a36da18955f2c273e4f87 REF https://github.com/adonisjs/http-server/commit/71a0a8e375c375e3588ba44ef68b0ef5a993c3d3 REF https://github.com/adonisjs/http-server/releases/tag/v8.2.1 REF https://github.com/adonisjs/http-server/releases/tag/v9.1.0 REF https://github.com/adonisjs/http-server/security/advisories/GHSA-cwm9-gfhc-46f6

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