# CVE-2026-34907: Reflected Cross-Site Scripting (XSS) in Wirtualna Uczelnia

> Attackers can execute arbitrary JavaScript in victims' browsers via a malicious URL, potentially leading to session hijacking or data theft.

- **Severity:** Medium 5.1 (`CVSS:4.0/AV:N/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:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 2 Jun 2026
- **Updated:** 2 Jun 2026
- **Also known as:** GHSA-vxh9-pjmh-2356

## What is CVE-2026-34907?

CVE-2026-34907 is a medium-severity cross-site scripting vulnerability in Simple SA Wirtualna Uczelnia, published on 2 Jun 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

Wirtualna Uczelnia is vulnerable to Reflected Cross‑Site Scripting (XSS) due to insecure handling of the locale parameter across multiple endpoints. An attacker can craft a malicious URL with JavaScript embedded in the locale parameter and send it to a victim. When the victim opens the link, the injected script will be executed in their browser.

This issue affects Wirtualna Uczelnia versions up to wu#2016.437.295#0#20260327_105545

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

## Which versions are affected by CVE-2026-34907?


## How do I fix CVE-2026-34907?

No fix has been published for CVE-2026-34907 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-34907 being exploited?

There is no known exploitation of CVE-2026-34907 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-34907 and fix it if it is affected.

What it is: CVE-2026-34907 is a medium-severity cross-site scripting vulnerability in Simple SA Wirtualna Uczelnia, published on 2 Jun 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-2026-34907 in the wild and no public exploit code.

Affected product: Simple SA Wirtualna Uczelnia. 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-2026-34907/ (Markdown: https://insights.sbomify.com/CVE-2026-34907/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-34907
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-34907
- OSV: https://osv.dev/vulnerability/CVE-2026-34907

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-34907/
Summaries are generated and may contain mistakes; the official description above is the record.