Technical audit · 2026-05-29

mavcsoport.hu

Hungarian State Railways (MÁV Group)

The Hungarian State Railways group (MÁV) — 54 requests, 5 domains. Prior to any consent, two Google tags fire simultaneously — the analytics tag GA4 and the advertising tag Google Ads (Adwords) — along with Google Fonts. Google Analytics and marketing cookies are declared in the policy, but the advertising tag, which under the rules requires prior consent, fires before it; Google Fonts is not named in the policy. All calls go to Google (USA).

Timeline of the leak

+0…+306 ms · entry via a related domain
The visit begins at mavstart.hu (the MÁV group's passenger service), which redirects (307→302) to www.mavcsoport.hu. Markup and assets are then served from the first-party domain (Drupal).
+863 ms · Google tags prior to consent
Two tags load via Google Tag Manager: GA4 (G-1MXJFLK4V8) and Google Ads / Adwords (AW-786697798). The latter is an advertising (marketing) tag. The visitor's IP address is transmitted to Google (USA).
+1147…+1540 ms · Google Fonts prior to consent
CSS from fonts.googleapis.com and Open Sans font files from fonts.gstatic.com. The visitor's IP address and Referer header are transmitted to Google (USA).
the consent mechanism does not hold back the tags
The Google Ads marketing tag and the GA4 analytics tag fire before and independently of any consent; under the applicable rules, marketing tags should launch only after consent is given.
Facebook Pixel does not fire in the capture
The Facebook Pixel declared in the policy is not observed in this capture. There is also no separate GA /g/collect call within the capture window; the tags themselves are, however, loaded.

Declared versus actual

MÁV's data processing/privacy notice (Adatkezelési/adatvédelmi tájékoztató) — necessary cookies + Google Analytics (traffic measurement) + marketing cookies (Google Adwords and Facebook Pixel) for measuring advertising campaign effectiveness — declared
The file supplied — the MÁV Csoport 2025 accessibility statement (concerning WCAG requirements) — is unrelated to cookies — declared
+ Google Fonts (fonts.googleapis.com, fonts.gstatic.com) — third-party recipient of IP address from the USA, prior to consent, not named in the policy — not declared
+ Facebook Pixel — declared in the policy, but not observed in this capture — not declared

Transfer timings

+863 ms www.googletagmanager.com

gtag — GA4 (G-1MXJFLK4V8) and Google Ads (AW-786697798). Google, USA.

+1147 ms fonts.googleapis.com

Google Fonts CSS (Open Sans). Google, USA.

+1518 ms fonts.gstatic.com

Google font files (Open Sans, ×3). Google, USA.

Detected trackers

Indicators of GDPR non-compliance

Context

mavcsoport.hu is the corporate website of the MÁV group (Magyar Államvasutak, Hungarian State Railways), the state railway holding company that brings together passenger transport (MÁV-START), infrastructure (MÁV Pályaműködtetési), and the parent company MÁV Zrt. The data controller is the companies of the MÁV group. The site is built on Drupal. Capture: 54 requests, 5 domains, recorded in a clean browser.

Google (USA) — the visitor’s IP address via the GA4 and Google Ads (Adwords) tags, as well as via Google Fonts. There are no other third-party recipients in the capture.

Declared versus Actual

MÁV’s cookie policy describes tracking honestly and by name: it names the necessary cookies, Google Analytics for traffic measurement, and — in a separate line — marketing cookies, explicitly naming Google Adwords and Facebook Pixel as tools for measuring advertising campaign effectiveness. That is, at the level of the document, recipients are disclosed, including advertising ones.

The capture, however, reveals a problem not with disclosure but with timing. At +863 ms, before any consent, two tags load simultaneously via Google Tag Manager: the analytics tag GA4 (G-1MXJFLK4V8) and the advertising tag Google Ads / Adwords (AW-786697798). The second tag is a marketing tag, and under the policy’s own classification, it falls precisely within the marketing cookie category. Under the ePrivacy rules, marketing tags require prior consent: they should launch only after the visitor has given it. Here, however, the tag fires unconditionally, in the complete absence of any recorded consent (Set-Cookie is zero).

Additionally, at +1147 ms, Google Fonts connects (the Open Sans font), transmitting the visitor’s IP address and Referer header to Google (USA). Unlike Analytics and the advertising services, Google Fonts is not named in the policy at all.

The Google tags (GA4 and Google Ads) fire at +863 ms; Google Fonts at +1147–1540 ms — all before any action by the visitor. The key point: the Google Ads advertising tag, which under the rules should wait for consent, fires before it. No consent was given during the session (Set-Cookie is zero).

What Cannot Be Asserted from This Capture

The GA4 and Google Ads tags are loaded in the capture — this alone has already transmitted the IP address to Google — but there are no separate GA /g/collect or Google Ads conversion beacon calls within the capture window, so the HAR cannot establish exactly which events were sent; the fact of IP address transmission upon tag loading did, however, occur. The Facebook Pixel declared in the policy is not observed in this capture — no conclusion about its behavior can be drawn from this snapshot. The calls to mavstart.hu at the start of the capture are redirects from a related domain within the MÁV group, not a third-party tracker. The tags may operate in Consent Mode, holding back part of the processing until consent is given; this does not negate the transfer of the IP address upon their loading. Google may use edge nodes within the EU; the conclusion drawn therefore concerns the recipient’s corporate affiliation (Google, USA), not the location of the node. The capture was recorded in a lean form without response bodies, so the visual state of the banner cannot be reconstructed from it. Server-side processing is not visible in a browser-based capture.

Conclusion

The corporate website of the Hungarian State Railways group transmits the visitor’s IP address to Google, prior to any consent, via several channels at once: the GA4 analytics tag, the Google Ads (Adwords) advertising tag, and Google Fonts. MÁV’s cookie policy, unlike many sites, discloses both analytics and marketing services by name — but this is precisely what makes the violation particularly stark: the advertising tag, which the policy itself classifies as marketing and which under the rules requires prior consent, fires before the visitor makes any choice. The IP address is additionally transmitted via the undisclosed Google Fonts. Launching a marketing tag and transferring the IP address to a third-party recipient in the USA prior to consent constitutes a violation of the requirements concerning the proper sequencing of consent and cross-border transfer. The remedy is within the operator’s control: launch the Google Ads and Google Analytics tags only after consent is given via a correctly configured consent mechanism, and host Google Fonts locally on the site’s own domain.

Evidence
Original (audit)
HAR file: hu/mavcsoport-hu-2026-05-29.har
SHA-256: f3d0acb2a6d1fe347098fa25a7e1c730aabf5b4f6a61097f460ef6d14fb16e25
Re-check snapshot
Awaiting changes
HAR files are stored on EU infrastructure (Proton Drive). SHA-256 is published for integrity verification.
IMPORTANT: before filing a complaint with the regulator, first contact the company directly and give it 30 days to respond. Without this step the regulator may reject the complaint. Details and a template letter to the company are in the Methodology.
Ready-to-send complaint letter

Where to file: Hungarian National Authority for Data Protection (NAIH)file a complaint online →

To: Hungarian National Authority for Data Protection (NAIH)
From: [Your name], [contact email]

1. Subject of the complaint
I am filing a complaint regarding the processing of my personal data by the website mavcsoport.hu.

2. Circumstances
I visited the website mavcsoport.hu and found indications that the processing of my personal data does not comply with the GDPR. The technical analysis published on gdpru.eu on 29 May 2026 (open methodology, reproducible measurements) documents the following indications:

1) On page load, prior to any consent, two Google tags load simultaneously via Google Tag Manager: GA4 (G-1MXJFLK4V8) and Google Ads / Adwords (AW-786697798) — both at +863 ms. Google Ads is a marketing (advertising) tag, and MÁV's own policy explicitly classifies Google Adwords as a marketing cookie used to measure the effectiveness of advertising campaigns. Under the applicable rules, marketing tags require prior consent; here, however, the tag fires unconditionally. Set-Cookie across the entire session is zero; there is no consent, yet the call to Google has already taken place.

2) In addition to the Google tags, Google Fonts loads prior to consent (CSS from fonts.googleapis.com at +1147 ms and Open Sans font files from fonts.gstatic.com at +1518–1540 ms), transmitting the visitor's IP address and Referer header to Google (USA). MÁV's cookie policy names Google Analytics and marketing services (Google Adwords, Facebook Pixel), but does not mention Google Fonts as a recipient.

Full technical documentation is published at: https://gdpru.eu/en/audits/hu-mavcsoport-hu/

3. Provisions violated
ePrivacy (Hungarian implementation) — marketing tag prior to consent; GDPR Art. 13(1)(e) + Chapter V — disclosure of recipients and cross-border transfer

4. Request
I request that you investigate the violations described and apply the measures provided for in Article 58(2) GDPR.

5. Attachments
The full evidence base — the HAR file, its SHA-256 checksum and the quotation from the site's privacy policy documenting the stated contradiction — is published and verifiable at the link in point 2 above.

[Date]                                    [Signature / name]