CVE-2026-63397Network attack vector

Code execution via unescaped JSDoc terminator

Published Jul 16, 2026 · Updated Jul 16, 2026

Code injection in remorses Genql before 6.3.4 allows remote authenticated users to execute arbitrary code through a crafted GraphQL schema. The comment renderer writes schema-derived description and deprecation text into JSDoc blocks without escaping */ sequences, so injected text becomes top-level TypeScript in schema.ts. Exploitation requires control of the input schema and a separate user or build process to generate, bundle, and import the client; execution then has that process's privileges.

CVSS severity7.1
High
EPSS probability0.48%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in remorses Genql before 6.3.4 allows remote authenticated users to execute arbitrary code through a crafted GraphQL schema. The comment renderer writes schema-derived description and deprecation text into JSDoc blocks without escaping */ sequences, so injected text becomes top-level TypeScript in schema.ts. Exploitation requires control of the input schema and a separate user or build process to generate, bundle, and import the client; execution then has that process's privileges.

The record

CVE
CVE-2026-63397
Published
Jul 16, 2026
Updated
Jul 16, 2026
Vendor
remorses
Product
Genql
Classifications
CWE-116, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 16, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

remorses · Genqlversion=0 <6.3.4

Published CVSS scores

7.1GitHubCVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-116Improper Encoding or Escaping of Output
T1204.002User Execution: Malicious File

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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