Momondo (com.momondo.flightsearch): Privacy & Security Findings

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Permanent Disclosure Ledger

The discipline, demonstrated

On behalf of our research partners, we investigate publicly distributed Android and iOS apps: we decompile them, follow their code and data flows, and trace every connection to the servers it reaches. Hundreds of agents work through each app and join the technical evidence into one picture, which our specialists then review and verify.

387+
Android/iOS apps audited
Every app is decompiled at source-code level, not just scanned from outside.
1.04M+
Smali classes read
The full shipped code we have actually read, not an estimate.
262+
Critical findings recorded
Confirmed findings copied to regulators, not theoretical risks.
970+
Weak points found
Third-party tracking we have provably found inside the binary.
567+
Endpoints investigated
Real servers and countries where data actually flows.
132+
SDK instances mapped
Reusable libraries correlated across the entire corpus.
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Showing the report for Momondo.
OrganisationNotifiedStatusSevIntel (click to expand)StatutesResolvedDisclosureElapsedReport
Momondo
NASDAQ
2026-06-27
90d ago
CS deflect
High
The Momondo app is, underneath its own branding, actually Kayak's software: Kayak's code makes up the overwhelming majority of the app, and the only Momondo-specific address anywhere inside it is a technical verification file. It records your screen and can capture your email address before you have consented, all over connections with no encryption protection, while never disclosing that Kayak is the real company actually controlling your data.
Momondo A/S (Copenhagen, DK) - Booking Holdings. 32,895 Kayak Software classes compiled into Momondo APK (18× larger than any SDK we have documented). Firebase project android-kayak-app, all backend URLs kayak.com, Kayak Internal Root CA (CN=KAYAK Internal Root CA, 2018–2028) + R9 Intermediate Authority 2 (2022–2027) embedded in production binary. Only Momondo-branded URL in entire APK: assetlinks.json. Art. 13(1)(a)/(e) + Art. 26 joint-controller Momondo A/S ↔ Kayak Software Corp undisclosed. FullStory (164 classes, Rust/JNI): InstrumentInjectorBridgeImpl ≥60 lambda instances instruments all Views + Flutter + WebViews. EMAIL as capturable field. RustInterface native bridge = scope unverifiable. 3× pre-consent init + RECEIVE_BOOT_COMPLETED. cleartextTrafficPermitted=true. MoEngage CRM (273 classes). Firebase key AIzaSyBU2D-F13xppK1YHe-NKO12lch2KEmPXCs hardcoded. Datatilsynet = lead authority. Nine messages sent across 87 days; Kayak's counsel engaged substantively twice (27 August, 22 September) after 61 days of auto-replies, then declined to provide the specific documentation requested, citing internal confidentiality. Case closed and published 2026-09-25, on the stated embargo date. BCC: Datatilsynet + BfDI + DSB + CERT.at.
click to expand
GDPR Art. 13GDPR Art. 32
Yes
Closed
Disclosure
90d 00h 00m 00s
Published
PDF

This ledger is updated in real time as companies respond. Silence is public. Severity is scored primarily by CVSS v4.0, we reserve the right to deviate based on blast radius.