# CVE-2026-1436: Improper Access Control (IDOR) vulnerability in Graylog Web Interface

> Authenticated users can access other users' profiles and sensitive information by modifying the user ID in the URL due to missing authorization checks.

- **Severity:** High 7.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Feb 2026
- **Updated:** 18 Feb 2026
- **Also known as:** GHSA-ff7j-jwgr-hgxp

## What is CVE-2026-1436?

CVE-2026-1436 is a high-severity missing authorization vulnerability in Graylog Web Interface, published on 18 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Improper Access Control (IDOR) in the Graylog API, version 2.2.3, which occurs when modifying the user ID in the URL. An authenticated user can access other user's profiles without proper authorization checks. Exploiting this vulnerability allows valid users of the system to be listed and sensitive third-party information to be accessed, such as names, email addresses, internal identifiers, and last activity. The endpoint 'http://<IP>:12900/users/<my_user>' does not implement object-level authorization validations.

Weakness: CWE-639 (Authorization Bypass Through User-Controlled Key)

## Which versions are affected by CVE-2026-1436?

It affects 1 product.


Products: Graylog Graylog.

## How do I fix CVE-2026-1436?

No fix has been published for CVE-2026-1436 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1436 being exploited?

There is no known exploitation of CVE-2026-1436 in the wild and no public exploit code.

## Other vulnerabilities in Graylog Web Interface

- [CVE-2021-37759](https://insights.sbomify.com/CVE-2021-37759/): Information disclosure in n/a (critical 9.8)
- [CVE-2021-37760](https://insights.sbomify.com/CVE-2021-37760/): Information disclosure in n/a (critical 9.8)
- [CVE-2026-1435](https://insights.sbomify.com/CVE-2026-1435/): Incorrect management of session invalidation vulnerability in Graylog Web Interface (critical 9.3)
- [CVE-2025-53106](https://insights.sbomify.com/CVE-2025-53106/): Graylog vulnerable to privilege escalation through API tokens (high 8.8)
- [CVE-2024-24824](https://insights.sbomify.com/CVE-2024-24824/): graylog2-server vulnerable to instantiation of arbitrary classes triggered by API request (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1436 and fix it if it is affected.

What it is: CVE-2026-1436 is a high-severity missing authorization vulnerability in Graylog Web Interface, published on 18 Feb 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-1436 in the wild and no public exploit code.

Affected product: Graylog Web Interface. 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-2026-1436/ (Markdown: https://insights.sbomify.com/CVE-2026-1436/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1436
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1436
- OSV: https://osv.dev/vulnerability/CVE-2026-1436

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-1436/
Summaries are generated and may contain mistakes; the official description above is the record.