# CVE-2026-10850: Plane 1.3.1 - Stored XSS in intake issue description_html

> A low-privileged user can inject malicious scripts into intake work item descriptions, potentially compromising other users' sessions.

- **Severity:** Medium 6.9 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **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 available:** No
- **Published:** 17 Jun 2026
- **Updated:** 17 Jun 2026
- **Also known as:** GHSA-4fp8-7gvj-j2xg

## What is CVE-2026-10850?

CVE-2026-10850 is a medium-severity cross-site scripting vulnerability in Plane, published on 17 Jun 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

Plane CE 1.3.1 allows a low-privileged project member to submit arbitrary HTML/JS in the description_html field when creating an intake work item through the API v1 intake endpoint.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-10850?

It affects 1 product.


Products: Plane Plane.

## How do I fix CVE-2026-10850?

No fix has been published for CVE-2026-10850 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-10850 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10850 exists.

## Other vulnerabilities in Plane

- [CVE-2024-47830](https://insights.sbomify.com/CVE-2024-47830/): Plane allows server side request forgery via /_next/image endpoint (critical 9.3)
- [CVE-2026-30242](https://insights.sbomify.com/CVE-2026-30242/): Plane: SSRF via Incomplete IP Validation in Webhook URL Serializer (high 8.5)
- [CVE-2026-46558](https://insights.sbomify.com/CVE-2026-46558/): Missing authorization in plane (high 8.3)
- [CVE-2026-39843](https://insights.sbomify.com/CVE-2026-39843/): Plane has a Server-Side Request Forgery (SSRF) in Favicon Fetching (high 7.7)
- [CVE-2026-27706](https://insights.sbomify.com/CVE-2026-27706/): Plane Vulnerable to Full Read SSRF via Favicon Fetching in "Add Link" Feature (high 7.7)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-10850 and fix it if it is affected.

What it is: CVE-2026-10850 is a medium-severity cross-site scripting vulnerability in Plane, published on 17 Jun 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-10850 exists.

Affected product: Plane. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-10850/ (Markdown: https://insights.sbomify.com/CVE-2026-10850/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-10850
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-10850
- OSV: https://osv.dev/vulnerability/CVE-2026-10850

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-10850/
Summaries are generated and may contain mistakes; the official description above is the record.