CVE-2026-28808

The record

Incorrect Authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scripts protected by directory rules when served via script_alias. When 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. This 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. This issue affects OTP from OTP 17.0 before OTP 26.2.5.19, OTP 27.3.4.10, and OTP 28.4.2, corresponding to inets from 5.10 before 9.1.0.6, 9.3.2.4, and 9.6.2. Whether OTP before OTP 17.0, corresponding to inets before 5.10, is affected is unknown.

Affected packages

Related vulnerabilities

• CVE-2026-42790 Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_cert and… Also affects erlang
• CVE-2026-42789 Improper Following of a Certificate's Chain of Trust vulnerability in Erlang OTP… Also affects erlang
• CVE-2026-42791 Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp… Also affects erlang
• CVE-2026-32147 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')… Also affects erlang
• CVE-2026-32144 Improper Certificate Validation vulnerability in Erlang OTP public_key (pubkey_ocsp… Also affects erlang
• CVE-2026-28810 Generation of Predictable Numbers or Identifiers vulnerability in Erlang/OTP kernel… Also affects erlang
• CVE-2026-23943 Improper Handling of Highly Compressed Data (Compression Bomb) vulnerability in Erlang… Also affects erlang
• CVE-2026-23942 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')… Also affects erlang