CVE-2026-30691Public exploitNetwork attack vector

Browser script execution via unsanitized text rendering

Published May 20, 2026 · Updated May 20, 2026

Cross-site scripting in @cyntler/react-doc-viewer 1.17.1 allows remote attackers to execute JavaScript through a crafted .txt file. TXTRenderer in src/renderers/txt/index.tsx casts currentDocument.fileData directly to ReactNode without sanitizing or escaping the file content. Execution requires a victim to load the attacker-controlled text file in an application using the viewer, exposing the browser session to script-driven data access and actions.

CVSS severity6.1
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in @cyntler/react-doc-viewer 1.17.1 allows remote attackers to execute JavaScript through a crafted .txt file. TXTRenderer in src/renderers/txt/index.tsx casts currentDocument.fileData directly to ReactNode without sanitizing or escaping the file content. Execution requires a victim to load the attacker-controlled text file in an application using the viewer, exposing the browser session to script-driven data access and actions.

The record

CVE
CVE-2026-30691
Published
May 20, 2026
Updated
May 20, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 20, 2026CVE publishedPublication date reported by the CVE source.
  2. May 20, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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