CVE-2026-42192 Plunk: Stored XSS in campaign view
Authenticated users can inject malicious scripts into email campaigns that execute in admin browsers, enabling session hijacking and unauthorized actions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-42192?
CVE-2026-42192 is a medium-severity cross-site scripting vulnerability in useplunk plunk, published on 8 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Plunk is an open-source email platform built on top of AWS SES. Prior to version 0.9.0, a stored cross-site scripting (XSS) vulnerability exists in the campaign management feature, where the email body content created by authenticated project members is stored and later rendered in the admin dashboard using React's dangerouslySetInnerHTML without any HTML sanitization. This allows a lower-privileged member to embed malicious scripts in a campaign's email body that execute in the context of any admin or other member who views the campaign, potentially enabling session hijacking or unauthorized actions on their behalf. This issue has been patched in version 0.9.0.
Weakness: CWE-79
Which versions are affected by CVE-2026-42192?
How do I fix CVE-2026-42192?
No fix has been published for CVE-2026-42192 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-2026-42192 being exploited?
There is no known exploitation of CVE-2026-42192 in the wild and no public exploit code.
Sources
Also known as GHSA-mjqc-qrv3-24hq.