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MEDIUM severity

CVE-2026-30691 — @cyntler/react-doc-viewer

MEDIUM

CVE-2026-30691 is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in @cyntler/react-doc-viewer. No vendor fix is recorded yet; mitigation options are listed below.

@cyntler/react-doc-viewer's TXTRenderer fails to sanitize file content and explicitly casts raw data as a ReactNode

Published
May 20, 2026
Updated
Sep 10, 2026
Affected
1 pkg
Patched
None yet
Exploits
None indexed
Exploitation data as of Oct 1, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

Proof-of-concept exploit code exists

  • CISA’s SSVC triage found public proof-of-concept exploit code for this CVE, though no confirmed active exploitation.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-30691.

EPSS Exploitation Probability

via FIRST.org ↗
0.3%probability of exploitation in next 30 days
Lower Risk+0.01%
Lower risk than most CVEs22th percentile — riskier than 22% of all scored CVEsHighest risk
0.00%0.27%0.54%0.81%0.0%0.3%0.3%0.3%0.3%Jun 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

CVE-2026-30691 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 381,682 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

81other npm packages depend on this — each one inherits the vulnerability until it's patched upstream
@cyntler/react-doc-viewernpm
281Kdownloads / week

Description

Cross-Site Scripting (XSS) vulnerability in @cyntler/react-doc-viewer v1.17.1 allows remote attackers to execute arbitrary JavaScript via a crafted .txt file. The TXTRenderer component fails to sanitize file content and explicitly casts raw data as a ReactNode.

Affected Packages

1 total
EcosystemPackageVulnerable rangeFix
📦npm@cyntler/react-doc-viewerall versionsNo fix

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for @cyntler/react-doc-viewer, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Remediation status

    No patched version of @cyntler/react-doc-viewer has shipped for CVE-2026-30691 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

  3. Mitigate without a patch

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

Cross-Site Scripting (XSS) vulnerability in @cyntler/react-doc-viewer v1.17.1 allows remote attackers to execute arbitrary JavaScript via a crafted .txt file. The TXTRenderer component fails to sanitize file content and explicitly casts raw data as a ReactNode.
O3 Security · Impact-Aware SCA

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