# CVE-2026-23481: Blinko: Authenticated Arbitrary File Write - saveAdditionalDevFile

> Authenticated attackers can write arbitrary files via the saveAdditionalDevFile function, potentially leading to code execution or data modification.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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:** 23 Mar 2026
- **Updated:** 24 Mar 2026
- **Also known as:** GHSA-38hg-8p2j-76g5

## What is CVE-2026-23481?

CVE-2026-23481 is a medium-severity path traversal vulnerability in blinkospace blinko, published on 23 Mar 2026. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

Blinko is an AI-powered card note-taking project. Prior to version 1.8.4, there is an authenticated arbitrary file write vulnerability in saveAdditionalDevFile. This issue has been patched in version 1.8.4.

Weakness: CWE-22 (Improper Limitation of a Pathname to a Restricted Directory)

## Which versions are affected by CVE-2026-23481?

It affects 1 product.


Products: Blinko Blinko.

## How do I fix CVE-2026-23481?

No fix has been published for CVE-2026-23481 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-23481 being exploited?

There is no known exploitation of CVE-2026-23481 in the wild and no public exploit code.

## Other vulnerabilities in blinkospace blinko

- [CVE-2026-23882](https://insights.sbomify.com/CVE-2026-23882/): Blinko: Admin RCE - MCP Server Command Injection (high 8.6)
- [CVE-2026-23482](https://insights.sbomify.com/CVE-2026-23482/): Blinko: Unauthorized Arbitrary File Read - /api/file/temp (high 8.2)
- [CVE-2026-23483](https://insights.sbomify.com/CVE-2026-23483/): Blinko: Unauthorized Arbitrary File Read - /plugins (medium 6.9)
- [CVE-2026-23485](https://insights.sbomify.com/CVE-2026-23485/): Blinko: Unauthorized Path Traversal File Enumeration - music-metadata (medium 6.9)
- [CVE-2026-23486](https://insights.sbomify.com/CVE-2026-23486/): Blinko: Unauthorized User Information Leak (medium 6.9)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-23481 and fix it if it is affected.

What it is: CVE-2026-23481 is a medium-severity path traversal vulnerability in blinkospace blinko, published on 23 Mar 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-2026-23481 in the wild and no public exploit code.

Affected product: blinkospace blinko. 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-2026-23481/ (Markdown: https://insights.sbomify.com/CVE-2026-23481/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-23481
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-23481
- OSV: https://osv.dev/vulnerability/CVE-2026-23481

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-23481/
Summaries are generated and may contain mistakes; the official description above is the record.