# CVE-2026-28506: Outline's Information Disclosure in Activity Logs allows User Enumeration of Private Drafts

> Authenticated users can enumerate private draft IDs via activity logs, bypassing access controls and enabling further IDOR attacks.

- **Severity:** Medium 4.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A: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:** 17 Mar 2026
- **Updated:** 17 Mar 2026
- **Also known as:** GHSA-69x7-6fcr-mm6g

## What is CVE-2026-28506?

CVE-2026-28506 is a medium-severity vulnerability in outline, published on 17 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Outline is a service that allows for collaborative documentation. Prior to 1.5.0, the events.list API endpoint, used for retrieving activity logs, contains a logic flaw in its filtering mechanism. It allows any authenticated user to retrieve activity events associated with documents that have no collection (e.g., Private Drafts, Deleted Documents), regardless of the user's actual permissions on those documents. While the document content is not directly exposed, this vulnerability leaks sensitive metadata (such as Document IDs, user activity timestamps, and in some specific cases like the Document Title of Permanent Delete). Crucially, leaking valid Document IDs of deleted drafts removes the protection of UUID randomness, making High-severity IDOR attacks (such as the one identified in documents.restore) trivially exploitable by lowering the attack complexity. Version 1.5.0 fixes the issue.

Weakness: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)

## Which versions are affected by CVE-2026-28506?

It affects 1 product.


Products: Getoutline Outline.

## How do I fix CVE-2026-28506?

No fix has been published for CVE-2026-28506 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-28506 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-28506 exists.

## Other vulnerabilities in outline

- [CVE-2026-33640](https://insights.sbomify.com/CVE-2026-33640/): Outline has a rate limit bypass that allows brute force of email login OTP (critical 9.1)
- [CVE-2024-37829](https://insights.sbomify.com/CVE-2024-37829/): Auth bypass in n/a (high 8.8)
- [CVE-2023-54331](https://insights.sbomify.com/CVE-2023-54331/): Outline 1.6.0 - Unquoted Service Path (high 8.5)
- [CVE-2023-3532](https://insights.sbomify.com/CVE-2023-3532/): Cross-site Scripting (XSS) - Stored in outline/outline (high 8.5)
- [CVE-2026-24901](https://insights.sbomify.com/CVE-2026-24901/): Outline's IDOR allows unauthorized viewing and seizing of private deleted drafts (high 8.1)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-28506 and fix it if it is affected.

What it is: CVE-2026-28506 is a medium-severity vulnerability in outline, published on 17 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-28506 exists.

Affected product: outline. 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-2026-28506/ (Markdown: https://insights.sbomify.com/CVE-2026-28506/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-28506
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-28506
- OSV: https://osv.dev/vulnerability/CVE-2026-28506

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-28506/
Summaries are generated and may contain mistakes; the official description above is the record.