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Cross-site Scripting (XSS)Weakness · CWE-79

CVE-2026-34907

MEDIUM · 5.1 CVSS v4.0 Published 2026-06-02
Mitigation only
No fix yet — a mitigation exists. There is no fixed release. A documented workaround reduces exposure in the meantime.
See remediation →
58/100
Remediation priority · Elevated
Remotely reachable No privileges

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis · moderate confidence

Reflected Cross-Site Scripting vulnerability in Wirtualna Uczelnia where the locale parameter is not properly sanitized across multiple endpoints, allowing injection of arbitrary JavaScript that executes in victim browsers when they click crafted malicious links.

MitigationImplement proper input validation and output encoding for the locale parameter across all affected endpoints, using context-aware escaping or a whitelist approach for allowed locale values.

Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
Authentication
X
User interaction
A
Scope
X

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.

dbcve checks

Work through these to decide whether this CVE applies to you.

  1. Identify Wirtualna Uczelnia installation
    Locate the application by checking for typical installation paths, service configurations, or web server directories that host this academic platform software. Look for processes named 'wirtualna-uczelnia' or check your web server's document root for the application.
    Affected if The software is present in the environment and handles academic/institutional workflows.
  2. Determine the installed version
    Check version files, About pages, or admin panels within the application for the exact version number. Compare against any release notes or changelogs if accessible.
    Affected if The installed version is unknown or falls within an unpatched release range.
  3. Inspect HTTP request handling for the locale parameter
    Use a web proxy or browser developer tools to capture requests sent to the application. Identify endpoints that accept a 'locale' or 'lang' parameter in query strings or POST data.
    Affected if The application accepts and processes a locale parameter in HTTP requests.
  4. Check if locale parameter is reflected without encoding
    Send a test request with a benign XSS probe payload in the locale parameter (such as <script>alert(1)</script> or "><img src=x onerror=alert(1)>). Examine the HTTP response body to see if the payload is rendered exactly as sent, without HTML entity encoding.
    Affected if The locale parameter value is reflected in the response HTML without being sanitized, encoded, or escaped.
  5. Verify multiple endpoints for the vulnerability
    Test different application endpoints (login, dashboard, settings, public pages) that might use the locale parameter. Not all endpoints may have the same sanitization behavior.
    Affected if Any endpoint reflects the locale parameter unencoded in HTML output.

If Wirtualna Uczelnia is running and the locale parameter is reflected in HTTP responses without HTML encoding, the environment is vulnerable to reflected XSS via CVE-2026-34907.

Generated from the published advisory. Verify against your own configuration.

Check your environment

Paste your version and any relevant configuration and it will be compared against the affected criteria above. Do not include secrets or credentials.

AI-assisted, checked against the advisory. Informational, not a guarantee.

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

From vendor data
Mitigation available No clean upgrade yet — mitigate in the meantime
Mitigation

Implement proper input validation and output encoding for the locale parameter across all affected endpoints, using context-aware escaping or a whitelist approach for allowed locale values.

Have this fixed Scoped from the published advisory
  • Consultation3.0 h
  • Implementation6.0 h
  • Testing4.0 h
  • Review / QA2.0 h
15.0 hours of engineering $2,640
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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2026-34907 in production — separate from our analysis above.

No notes yet

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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