CVE-2025-63823: My Safetipin Auth Bypass Vulnerability

CVE-2025-63823 Overview

CVE-2025-63823 affects My Safetipin Android Application version 5.2.1. The application contains hardcoded credentials within its authentication module. Attackers can exploit predictable one-time password (OTP) values to bypass authentication and gain unauthorized access to user accounts.

The vulnerability targets the mobile authentication flow. Remote attackers do not need prior access to a victim's device or credentials. Successful exploitation grants unauthorized access to user account data managed through the application.

Critical Impact
Remote attackers can bypass authentication and access arbitrary user accounts by supplying predictable OTP values embedded in the application's authentication module.

Affected Products

My Safetipin Android Application version 5.2.1
Android package identifier com.safetipin.mysafetipin
Distribution channel: Google Play Store

Discovery Timeline

2026-08-05 - CVE-2025-63823 published to the National Vulnerability Database (NVD)
2026-08-05 - Last updated in NVD database

Technical Details for CVE-2025-63823

Vulnerability Analysis

The flaw exists in the authentication module of the My Safetipin Android application. Developers embedded credential material directly into application code. This design allows the OTP verification step to accept predictable values rather than cryptographically random codes generated per session.

An attacker who reverse-engineers the Android package can recover the hardcoded values. The attacker then supplies these values during the login or verification flow. The server-side or client-side validation accepts the predictable OTP, granting access to targeted user accounts.

This class of weakness is categorized as Hardcoded Credentials [CWE-798]. Mobile applications distributed through public app stores expose their compiled bytecode to any analyst. Any secret embedded in the binary should be treated as public knowledge.

Root Cause

The root cause is the storage of authentication material inside the shipped application binary. OTP values must be generated per-session using a secure random source and validated server-side. Embedding fixed values in client code removes the entropy that makes OTP flows effective.

Attack Vector

An attacker downloads the application from Google Play. The attacker decompiles the APK using standard tooling such as apktool or jadx and extracts the hardcoded OTP values from the authentication module. The attacker then submits a target user's identifier along with the predictable OTP to the authentication endpoint. See the GitHub CVE-2025-63823 Advisory for technical reproduction details.

Detection Methods for CVE-2025-63823

Indicators of Compromise

Repeated authentication requests targeting different user identifiers from the same source IP or device fingerprint
Successful logins immediately following minimal or zero OTP request activity
Account access from geolocations or devices inconsistent with the user's normal usage

Detection Strategies

Instrument the authentication endpoint to log OTP submission patterns and flag repeated use of identical OTP values across accounts
Perform static analysis of the shipped APK to identify hardcoded strings within the authentication class paths
Compare submitted OTP values against a denylist of known hardcoded values recovered from the binary

Monitoring Recommendations

Alert on authentication success rates that spike without corresponding OTP generation events
Track failed and successful login attempts per account and per IP with short time windows
Review application logs for account takeovers reported by end users and correlate with authentication telemetry

How to Mitigate CVE-2025-63823

Immediate Actions Required

Uninstall My Safetipin Android Application version 5.2.1 until the vendor releases a fixed release
Force-invalidate existing sessions and require re-authentication once a patched version is deployed
Enable server-side rate limiting and account lockout on repeated OTP submission failures

Patch Information

No vendor patch has been referenced in the public advisory at the time of publication. Monitor the Google Play listing for My Safetipin for a version newer than 5.2.1 that removes hardcoded credentials from the authentication module.

Workarounds

Redesign the authentication flow so OTP values are generated server-side using a cryptographically secure random source
Remove all authentication secrets from client code and validate OTP submissions exclusively on the server
Add server-enforced OTP expiration, single-use enforcement, and per-account submission rate limits

bash

# Configuration example
# Server-side OTP generation and validation pseudocode
# Replace any client-embedded OTP logic with a server-issued token flow
curl -X POST https://api.example.com/auth/otp/request \
  -H 'Content-Type: application/json' \
  -d '{"user_id":"<user>"}'
# Server generates cryptographically random 6-digit OTP,
# stores hash with 5-minute TTL, and sends via SMS/email.
# Client submits OTP; server validates hash and marks single-use.