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HackerOne · disclosed report #17512

Account takeover

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Similar findings, side by side
ReportAccessWhose objectBoundary crossed
Improper Authentication - any user can login as other user with otp/logout & otp/loginA user accountAnother user'sAn authenticated user obtained an OTP token for another user's account by changing the user ID in the logout request.
Bypassing Digits origin validation which leads to account takeoverA user accountThe attacker's ownA lookalike origin sent a message accepted as coming from the trusted Digits origin, allowing account phone-number linkage.
Flickr Account Takeover using AWS Cognito APIA user accountAnother user'sAn attacker-controlled Cognito identity was treated as the victim’s Flickr account during login.
Chained Bugs to Leak Victim's Uber's FB Oauth TokenNo accountAnother user'sThe OAuth flow sent a victim’s token to an attacker-controlled site.
[cs.money] Open Redirect Leads to Account TakeoverNo accountAnother user'sThe victim's authenticated session token was sent to an attacker-controlled destination.
Change any Uber user's password through /rt/users/passwordless-signup - Account Takeover (critical)No accountAnother user'sAn unauthenticated caller set a password for an account identified by another user's phone number.
Bypass Password Authentication for updating email and phone number - Security VulnerabilityA user accountAnother user'sA hijacked authenticated session bypassed password re-authentication to change the account email.
Insufficient OAuth callback validation which leads to Periscope account takeoverNo accountAnother user'sOAuth callback validation allowed a victim's authorization token to reach an attacker-controlled destination.
Insufficient validation on Digits bridgeNo accountAnother user'sA site without the registered app domain bypassed the bridge check and received credentials authorized by the victim.
Ability to DOS any organization's SSO and open up the door to account takeoversA user accountAnother tenant'sSSO authentication for one organization resulted in user provisioning into an attacker-controlled organization.
Improper Validation at Partners LoginNo accountAnother user'sThe attacker caused a victim's authentication OTP to be sent to an attacker-controlled number.
Incorrect authorization to the intelbot service leading to ticket informationNot clear from the reportNo object involvedUnspecified authentication boundary; the report does not explain what access was gained.
Program
HackerOne
Status
Informative
Bounty
None stated
Weakness as filed
Improper Authentication - Generic
Disclosed
2014
Upvotes
16

Data as of 2026-11-15. CVE List through 2026-11-15 · EPSS of 2026-11-15 · CISA KEV checked 2026-11-15. Sources: the CVE List, CISA KEV, EPSS, NVD, nuclei templates and public bug bounty data.