CVE-2026-30691 @cyntler/react-doc-viewer's TXTRenderer fails to sanitize file content and explicitly casts raw data as a ReactNode
Remote attackers can execute arbitrary JavaScript via crafted text files due to unsanitized content in the React document viewer library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-30691?
CVE-2026-30691 is a medium-severity cross-site scripting vulnerability in n/a, published on 20 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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
Weakness: CWE-79
Which versions are affected by CVE-2026-30691?
2 open source packages ship an affected version, including @cyntler/react-doc-viewer.
| Package | Affected | Fixed in |
|---|---|---|
@cyntler/react-doc-viewer npm | All versions to 1.17.1 | None |
@cyntler/react-doc-viewer npm | All versions to 1.17.1 | None |
How do I fix CVE-2026-30691?
No fix has been published for CVE-2026-30691 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-30691 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-30691 exists.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-fvhg-p4hf-79x3.