# CVE-2026-27949: Plane Exposes User Email (PII and part of credential) in GET Parameter

> Attackers can obtain user email addresses by observing URLs during authentication errors, exposing PII and credential components.

- **Severity:** Low 2.0 (`CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** An administrator
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 7 Apr 2026
- **Updated:** 8 Apr 2026
- **Also known as:** GHSA-8rvg-7w43-p2w2

## What is CVE-2026-27949?

CVE-2026-27949 is a low-severity vulnerability in makeplane plane, published on 7 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.

### Official description

Plane is an an open-source project management tool. Prior to 1.3.0, a vulnerability was identified in Plane's authentication flow where a user's email address is included as a query parameter in the URL during error handling (e.g., when an invalid magic code is submitted). Transmitting personally identifiable information (PII) via GET request query strings is classified as an insecure design practice. The affected code path is located in the authentication utility module (packages/utils/src/auth.ts). This vulnerability is fixed in 1.3.0.

Weakness: CWE-598 (Use of HTTP Request With Sensitive Query String), CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-27949?

It affects 1 product.


Products: Plane Plane.

## How do I fix CVE-2026-27949?

No fix has been published for CVE-2026-27949 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27949 being exploited?

There is no known exploitation of CVE-2026-27949 in the wild and no public exploit code.

## Other vulnerabilities in makeplane 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-2026-27949 and fix it if it is affected.

What it is: CVE-2026-27949 is a low-severity vulnerability in makeplane plane, published on 7 Apr 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-27949 in the wild and no public exploit code.

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-2026-27949/ (Markdown: https://insights.sbomify.com/CVE-2026-27949/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27949
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27949
- OSV: https://osv.dev/vulnerability/CVE-2026-27949

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27949/
Summaries are generated and may contain mistakes; the official description above is the record.