# CVE-2026-1493: Cross-Site Scripting in LEX Baza Dokumentów

> Attacker can execute arbitrary JavaScript via DOM-based XSS in the em cookie parameter, requiring cookie setting capability.

- **Severity:** Medium 4.6 (`CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 30 Apr 2026
- **Updated:** 30 Apr 2026
- **Also known as:** GHSA-qh5j-h84r-q47c

## What is CVE-2026-1493?

CVE-2026-1493 is a medium-severity cross-site scripting vulnerability in Wolters Kluwer Polska LEX Baza Dokumentów, published on 30 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

### Official description

LEX Baza Dokumentów is vulnerable to DOM-based XSS in "em" cookie parameter. The application unsafely
processes the parameter on the client side, allowing an attacker to execute arbitrary
JavaScript in the context of the victim's browser.
An attacker with ability to set a cookie can perform a more severe attack, so we evaluate the impact and risk of exploitation as minimal. However, the vendor considered this a vulnerability and released a security patch.

This issue was fixed in version 1.3.4.

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

## Which versions are affected by CVE-2026-1493?

It affects 1 product.


Products: Wolterskluwer Lex Baza Dokumentow.

## How do I fix CVE-2026-1493?

No fix has been published for CVE-2026-1493 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-1493 being exploited?

There is no known exploitation of CVE-2026-1493 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-1493 and fix it if it is affected.

What it is: CVE-2026-1493 is a medium-severity cross-site scripting vulnerability in Wolters Kluwer Polska LEX Baza Dokumentów, published on 30 Apr 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-1493 in the wild and no public exploit code.

Affected product: Wolters Kluwer Polska LEX Baza Dokumentów. 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-2026-1493/ (Markdown: https://insights.sbomify.com/CVE-2026-1493/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-1493
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-1493
- OSV: https://osv.dev/vulnerability/CVE-2026-1493

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-1493/
Summaries are generated and may contain mistakes; the official description above is the record.