# CVE-2026-104973: Plane: DNS Rebinding Bypass of CVE-2026-30242 SSRF Fix in Webhook Delivery

> Attackers can bypass SSRF protections in Plane webhook delivery via DNS rebinding, potentially accessing internal network resources.

- **Severity:** High 7.6 (`CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 5 Oct 2026
- **Updated:** 7 Oct 2026

## What is CVE-2026-104973?

CVE-2026-104973 is a high-severity server-side request forgery vulnerability in makeplane plane, published on 5 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.

### Official description

Plane is an open-source project management tool. Prior to 1.4.0, the fix for CVE-2026-30242 validates webhook IP addresses only when the webhook is created in apps/api/plane/app/serializers/webhook.py. The delivery task in apps/api/plane/bgtasks/webhook_task.py performs a separate DNS resolution when sending the request and does not validate the resolved IP address, allowing DNS rebinding to bypass the SSRF protection. This issue is fixed in 1.4.0.

Weakness: CWE-918 (Server-Side Request Forgery)

## Which versions are affected by CVE-2026-104973?


## How do I fix CVE-2026-104973?

No fix has been published for CVE-2026-104973 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-104973 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104973 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-104973 and fix it if it is affected.

What it is: CVE-2026-104973 is a high-severity server-side request forgery vulnerability in makeplane plane, published on 5 Oct 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104973 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-2026-104973/ (Markdown: https://insights.sbomify.com/CVE-2026-104973/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-104973
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-104973
- OSV: https://osv.dev/vulnerability/CVE-2026-104973

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-104973/
Summaries are generated and may contain mistakes; the official description above is the record.