# CVE-2026-0521: Reflected Cross-Site Scripting in PDF Export Error Message

> Unauthenticated attackers can execute arbitrary JavaScript in victims' browsers via a malicious URL in the PDF export feature.

- **Severity:** Medium 5.6 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 6 Feb 2026
- **Updated:** 6 Feb 2026
- **Also known as:** GHSA-74rw-28vp-8wh9

## What is CVE-2026-0521?

CVE-2026-0521 is a medium-severity cross-site scripting vulnerability in TYDAC AG MAP+, published on 6 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A reflected cross-site scripting (XSS) vulnerability in the PDF export functionality of the TYDAC AG MAP+ solution allows unauthenticated attackers to craft a malicious URL, that if visited by a victim, will execute arbitrary JavaScript in the victim's context. Such a URL could be delivered through various means, for instance, by sending a link or by tricking victims to visit a page crafted by the attacker.

This issue was verified in MAP+: 3.4.0.

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

## Which versions are affected by CVE-2026-0521?

It affects 1 product.


Products: Tydac Map\+.

## How do I fix CVE-2026-0521?

No fix has been published for CVE-2026-0521 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-0521 being exploited?

There is no known exploitation of CVE-2026-0521 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-0521 and fix it if it is affected.

What it is: CVE-2026-0521 is a medium-severity cross-site scripting vulnerability in TYDAC AG MAP+, published on 6 Feb 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: There is no known exploitation of CVE-2026-0521 in the wild and no public exploit code.

Affected product: TYDAC AG MAP+. 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-2026-0521/ (Markdown: https://insights.sbomify.com/CVE-2026-0521/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-0521
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-0521
- OSV: https://osv.dev/vulnerability/CVE-2026-0521

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-0521/
Summaries are generated and may contain mistakes; the official description above is the record.