# CVE-2026-27742: Bludit <= 3.16.2 Stored XSS in Post Content

> Authenticated users can inject JavaScript into post content, leading to session hijacking and content manipulation for other users.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 23 Feb 2026
- **Updated:** 14 Jul 2026
- **Also known as:** GHSA-wg93-hp69-vv5w

## What is CVE-2026-27742?

CVE-2026-27742 is a medium-severity cross-site scripting vulnerability in Bludit, published on 23 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

### Official description

Bludit version 3.16.2 contains a stored cross-site scripting (XSS) vulnerability in the post content functionality. The application performs client-side sanitation of content input but does not enforce equivalent sanitation on the server side. An authenticated user can inject arbitrary JavaScript into the content field of a post, which is stored and later rendered to other users without proper output encoding. When viewed, the injected script executes in the context of the victim’s browser, allowing session hijacking, credential theft, content manipulation, or other actions within the user’s privileges.

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

## Which versions are affected by CVE-2026-27742?

It affects 1 product.


Products: Bludit Bludit.

## How do I fix CVE-2026-27742?

No fix has been published for CVE-2026-27742 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-27742 being exploited?

There is no known exploitation of CVE-2026-27742 in the wild and no public exploit code.

## Other vulnerabilities in Bludit

- [CVE-2020-18879](https://insights.sbomify.com/CVE-2020-18879/): File upload in n/a (critical 9.8)
- [CVE-2020-20495](https://insights.sbomify.com/CVE-2020-20495/): Path traversal in n/a (critical 9.1)
- [CVE-2020-18190](https://insights.sbomify.com/CVE-2020-18190/): Path traversal in n/a (critical 9.1)
- [CVE-2024-24550](https://insights.sbomify.com/CVE-2024-24550/): Bludit - Remote Code Execution (RCE) through File API (high 8.9)
- [CVE-2024-24551](https://insights.sbomify.com/CVE-2024-24551/): Bludit - Remote Code Execution (RCE) through Image API (high 8.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-27742 and fix it if it is affected.

What it is: CVE-2026-27742 is a medium-severity cross-site scripting vulnerability in Bludit, published on 23 Feb 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-27742 in the wild and no public exploit code.

Affected product: Bludit. 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-2026-27742/ (Markdown: https://insights.sbomify.com/CVE-2026-27742/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-27742
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-27742
- OSV: https://osv.dev/vulnerability/CVE-2026-27742

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-27742/
Summaries are generated and may contain mistakes; the official description above is the record.