Youssef Sammouda (sam0) personal blog

5 min read Original article ↗
  • Jan 29, 2023

    Account Takeover in Canvas Apps served in Comet due to failure in Cross-Window-Message Origin validation

  • Jan 29, 2023

    DOM-XSS in Instant Games due to improper verification of supplied URLs

  • Jan 29, 2023

    Account takeover of Facebook/Oculus accounts due to First-Party access_token stealing

  • May 14, 2022

    Multiple bugs chained to takeover Facebook Accounts which uses Gmail.

  • Mar 4, 2022

    More secure Facebook Canvas Part 2: More Account Takeovers

  • Sep 29, 2021

    Multiple bugs allowed malicious Android Applications to takeover Facebook/Workplace accounts

  • Sep 3, 2021

    More secure Facebook Canvas : Tale of $126k worth of bugs that lead to Facebook Account Takeovers

  • Jun 27, 2021

    Oversightboard.com site-wide CSRF due to missing checking

  • Jun 27, 2021

    Disclose unconfirmed email/phone of a Facebook user

  • May 20, 2021

    Oculus SSO "Account Linking" bug leads to account takeover on third party websites and inside VR Games/Apps

  • May 13, 2021

    One-click reflected XSS in www.instagram.com due to unfiltered URI schemes leads to account takeover

  • May 7, 2021

    Identify a Facebook user by his phone number despite privacy settings set

  • May 5, 2021

    Account takeover of Instagram accounts due to unrestricted permissions of third-party application's generated tokens

  • Apr 30, 2021

    Facebook account takeover due to unsafe redirects after the OAuth flow

  • Apr 2, 2021

    Facebook account takeover due to a bypass of allowed callback URLs in the OAuth flow

  • Apr 2, 2021

    Facebook account takeover due to a wide platform bug in ajaxpipe responses

  • Feb 18, 2021

    Expose Facebook object type (including private objects)

  • Feb 18, 2021

    Expose information about Partner accounts in Partner portal

  • Feb 18, 2021

    Ability to find Facebook employee's test accounts which lead to the disclosure of internal information.

  • Feb 18, 2021

    Disclose internal CMS objects content

  • Feb 18, 2021

    Confirm if an invitation is sent to a specific email in Partners Portal / Possibility to resend the invitation

  • Feb 18, 2021

    XSS in Facebook CDN due to improper filtering of uploaded files extensions

  • Feb 17, 2021

    Enumerate internal cached URLs which lead to data exposure

  • Feb 17, 2021

    Leaking Facebook user information to external websites / Setting some cookies values

  • Feb 17, 2021

    Open redirect in Instagram.com

  • Feb 17, 2021

    Access private information about SparkAR effect owners who has a publicly viewable portfolio

  • Feb 17, 2021

    Make recruiting referrals on behalf of employees

  • Feb 15, 2021

    Leak of internal categorySets names and employees test accounts.

  • Feb 15, 2021

    Delete linked payments accounts of a Facebook page (or user)

  • Feb 15, 2021

    Access files uploaded by employees to internal CDNs / Regenerate URL signature of user uploaded content.

  • Feb 15, 2021

    URLs in img tag aren't passed through safe_image.php which lead to exposure of Facebook users IPs.

  • Feb 15, 2021

    View orders and financial reports lists for any page shop

  • Jan 3, 2021

    Expose the email address of Workplace users

  • Jan 1, 2021

    XSS on forums.oculusvr.com leads to Oculus and Facebook account takeovers

  • Dec 31, 2020

    Bad regex used in Facebook Javascript SDK leads to account takeovers in websites that included it

  • Nov 7, 2020

    Facebook DOM Based XSS using postMessage

  • Jul 23, 2020

    Disclose content of internal Facebook javascript modules ( Revisited )

  • Jul 2, 2020

    Admin disclosure of Facebook verified pages/ Disclose Facebook employee assigned to help a verified page.

  • Jun 14, 2020

    Privilege escalation in Partners Portal to Admin access

  • Jun 14, 2020

    Internal directories enumeration in www

  • Jun 14, 2020

    Disclose the Instagram account linked to a Facebook user account or page

  • Jun 14, 2020

    Disclose internal files related to testing of some Facebook tools

  • May 2, 2020

    Exposure of Facebook object type by knowing the object ID

  • May 2, 2020

    Add draft subtitles to any Facebook video and Full Path Disclosure

  • Mar 11, 2020

    Generate valid signatures for files hosted in Facebook CDNs.

  • Mar 11, 2020

    Ability to bruteforce Instagram account's password due to lack of rate limitation protection

  • Feb 28, 2020

    Facebook CSRF bug which lead to Instagram Partial account takeover.

  • Jan 23, 2020

    Cross-Site Websocket Hijacking bug in Facebook that leads to account takeover

  • Nov 27, 2019

    Reflected XSS in graph.facebook.com leads to account takeover in IE/Edge

  • Sep 2, 2019

    HTML to PDF converter bug leads to RCE in Facebook server.

  • Aug 1, 2019

    Internal path disclosure in Instagram server

  • Aug 1, 2019

    Access portal of Facebook mobile retailers and see earnings and referrals reports.

  • Aug 1, 2019

    Send emails on behalf of legal_noreply@fb.com

  • Aug 1, 2019

    Download predictions details of ads plans of any business.

  • Aug 1, 2019

    View orders and financial reports lists for any page shop.

  • May 25, 2019

    Disclose files content from Facebook internal CDNs

  • Apr 22, 2019

    Disclose the content of internal Facebook Javascript modules.

  • Feb 16, 2019

    Bypass password confirmation in Facebook "DYI" feature

  • Feb 12, 2019

    Facebook CSRF protection bypass which leads to Account Takeover.

  • Feb 12, 2019

    Export Facebook audience network reports of any business

  • Feb 7, 2019

    Leak of private/in-development app ids, names and translation requests

  • Feb 7, 2019

    Internal paths disclosure due to improper exception handling

  • Jan 22, 2019

    Enroll in Facebook Ad-break program without Facebook approval

  • Jan 22, 2019

    Disclose page violations and its eligibility to use Ad-breaks

  • Jan 22, 2019

    Disclose page's admins and its Monetization payout details

  • Jan 22, 2019

    Disclose Instagram business account linked to a Facebook page

  • Jan 22, 2019

    Change payment account of any Facebook commerce page

  • Jan 22, 2019

    Expose business email and payment account balance of any Facebook commerce page.

  • Jan 22, 2019

    Bruteforce Instagram account's passwords (lack of rate limiting protection).

  • Jan 22, 2019

    Reveal if a Facebook merchant page has pending or completed orders.

  • Jan 22, 2019

    Generate Access Tokens for any Facebook user

  • Jan 22, 2019

    Modify users profiles of techprep.fb.com

  • Jan 22, 2019

    Uploading files to api.techprep.fb.com