# CVE-2026-49436: LinkAce vulnerable to stored XSS via 'javascript:' URI in Bulk Link API

> Authenticated users can inject JavaScript via the Bulk Link API, leading to session hijacking and cookie theft when victims click the malicious link.

- **Severity:** High 7.3 (`CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A: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:** 20 Aug 2026
- **Updated:** 21 Aug 2026
- **Also known as:** GHSA-6r73-pchm-4m39

## What is CVE-2026-49436?

CVE-2026-49436 is a high-severity cross-site scripting vulnerability in Kovah LinkAce, published on 20 Aug 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

LinkAce is a self-hosted archive to collect website links. Prior to version 2.5.7, the Bulk Link API endpoint (`POST /api/v2/bulk/links`) accepts URLs without any format validation, allowing an authenticated user to store a `javascript:` URI. The stored URI is later rendered verbatim as an `href` in Blade templates, and clicking it executes arbitrary JavaScript in the victim's browser — exfiltrating cookies and session tokens. Version 2.5.7 fixes the issue.

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

## Which versions are affected by CVE-2026-49436?


## How do I fix CVE-2026-49436?

No fix has been published for CVE-2026-49436 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-49436 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-49436 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-49436 and fix it if it is affected.

What it is: CVE-2026-49436 is a high-severity cross-site scripting vulnerability in Kovah LinkAce, published on 20 Aug 2026. Any signed-in user can exploit it over the network, 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-2026-49436 exists.

Affected product: Kovah LinkAce. 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-2026-49436/ (Markdown: https://insights.sbomify.com/CVE-2026-49436/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-49436
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-49436
- OSV: https://osv.dev/vulnerability/CVE-2026-49436

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-49436/
Summaries are generated and may contain mistakes; the official description above is the record.