# CVE-2026-105630: Plane: Stored XSS via SVG attachment served inline on the application origin (account takeover)

> An attacker can upload malicious SVG files that execute JavaScript in the victim's browser, leading to session hijacking and account takeover.

- **Severity:** High 8.7 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A: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:** 5 Oct 2026
- **Updated:** 5 Oct 2026
- **Also known as:** GHSA-ch8j-vr4r-qf6h

## What is CVE-2026-105630?

CVE-2026-105630 is a high-severity cross-site scripting vulnerability in makeplane plane, published on 5 Oct 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 is an open-source project management tool. Prior to 1.4.0, an authenticated low-privilege workspace member, including a Guest, can upload an image/svg+xml file as a generic or issue attachment. The file retains the attacker-controlled Content-Type, and the asset-download endpoint creates a presigned URL with Content-Disposition: inline. In the default self-hosted MinIO deployment, the asset URL is served from the same origin as the Plane application, allowing embedded SVG JavaScript to execute in the application's security context. A victim, including a workspace administrator, who opens the link can have the session compromised through stored XSS, leading to account takeover. This issue is fixed in 1.4.0.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation), CWE-616 (Incomplete Identification of Uploaded File Variables (PHP)), CWE-434 (Unrestricted Upload of File with Dangerous Type)

## Which versions are affected by CVE-2026-105630?


## How do I fix CVE-2026-105630?

No fix has been published for CVE-2026-105630 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-105630 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105630 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-105630 and fix it if it is affected.

What it is: CVE-2026-105630 is a high-severity cross-site scripting vulnerability in makeplane plane, published on 5 Oct 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-2026-105630 exists.

Affected product: makeplane 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-2026-105630/ (Markdown: https://insights.sbomify.com/CVE-2026-105630/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-105630
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-105630
- OSV: https://osv.dev/vulnerability/CVE-2026-105630

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-105630/
Summaries are generated and may contain mistakes; the official description above is the record.