# CVE-2026-45343: LinkAce - Stored XSS via Unsanitized SSO User's Name Rendered in Admin Audit Log Allows Session Hijacking

> Stored XSS in LinkAce admin audit log allows attackers to hijack admin sessions via malicious OAuth display names.

- **Severity:** High 8.5 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/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:** A user has to click or open something
- **Fix available:** No
- **Published:** 28 May 2026
- **Updated:** 30 May 2026
- **Also known as:** GHSA-jx4g-ph82-x9mm

## What is CVE-2026-45343?

CVE-2026-45343 is a high-severity cross-site scripting vulnerability in Kovah LinkAce, published on 28 May 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 2.5.6, LinkAce contains a stored cross-site scripting vulnerability that allows a low-privilege user to execute arbitrary JavaScript in an administrator's browser session. This affects instances configured with SSO/OAuth authentication, which is one of the supported authentication methods in LinkAce. An attacker who sets their OAuth display name to a malicious script and then creates an API token will plant a persistent XSS payload in the audit log. When any admin navigates to /system/audit, the payload executes in the admin's browser context. This enables session cookie theft, CSRF token exfiltration (exposed in the la-app-data meta tag), or any other action the admin can perform. This vulnerability is fixed in 2.5.6.

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

## Which versions are affected by CVE-2026-45343?


## How do I fix CVE-2026-45343?

No fix has been published for CVE-2026-45343 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-45343 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-45343 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-45343 and fix it if it is affected.

What it is: CVE-2026-45343 is a high-severity cross-site scripting vulnerability in Kovah LinkAce, published on 28 May 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-2026-45343 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-2026-45343/ (Markdown: https://insights.sbomify.com/CVE-2026-45343/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-45343
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45343
- OSV: https://osv.dev/vulnerability/CVE-2026-45343

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-45343/
Summaries are generated and may contain mistakes; the official description above is the record.