# CVE-2026-27627: Karakeep's Reddit plugin content bypasses DOMPurify sanitization, enabling stored XSS

> Stored XSS in Karakeep allows attackers to execute arbitrary scripts in user browsers via unsanitized Reddit content.

- **Severity:** High 8.2 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 25 Feb 2026
- **Updated:** 25 Feb 2026
- **Also known as:** GHSA-mg93-f9mw-wpgj

## What is CVE-2026-27627?

CVE-2026-27627 is a high-severity cross-site scripting vulnerability in karakeep-app karakeep, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

Karakeep is a elf-hostable bookmark-everything app. In version 0.30.0, when the Reddit metascraper plugin returns `readableContentHtml`, the HTML parsing subprocess uses it directly without running it through DOMPurify. Every other content source in the crawler goes through Readability + DOMPurify, but the Reddit path skips both. Since this content ends up in `dangerouslySetInnerHTML` in the reader view, any malicious HTML in the Reddit response gets executed in the user's browser. Version 0.31.0 contains a patch for this issue.

Weakness: CWE-79 (Improper Neutralization of Input During Web Page Generation)

## Which versions are affected by CVE-2026-27627?

It affects 1 product.


Products: Localhostlabs Karakeep.

## How do I fix CVE-2026-27627?

No fix has been published for CVE-2026-27627 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27627 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-27627 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27627 and fix it if it is affected.

What it is: CVE-2026-27627 is a high-severity cross-site scripting vulnerability in karakeep-app karakeep, published on 25 Feb 2026. An attacker can exploit it over the internet without logging in, 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-2026-27627 exists.

Affected product: karakeep-app karakeep. 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-2026-27627/ (Markdown: https://insights.sbomify.com/CVE-2026-27627/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27627
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27627
- OSV: https://osv.dev/vulnerability/CVE-2026-27627

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27627/
Summaries are generated and may contain mistakes; the official description above is the record.