CVE-2026-28808
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk42th percentile - higher than 42% of all known CVEs
Summary
In Erlang OTP (inets module), an incorrect authorization vulnerability exists. When script_alias maps a URL prefix to a directory outside DocumentRoot, mod_auth evaluates directory access controls against the DocumentRoot path while mod_cgi executes the script at the ScriptAlias path. This mismatch allows unauthenticated access to CGI scripts protected by directory rules.
Risk Assessment
An unauthenticated attacker can access protected CGI scripts, potentially performing unauthorized operations.
Recommendation
Update Erlang OTP to version 28.4.2, 27.3.4.10, or 26.2.5.19 (or later).
Original NVD description (English source)
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 28.4.2, OTP 27.3.4.10 and OTP 26.2.5.19, corresponding to inets from 5.10 before 9.6.2, 9.3.2.4 and 9.1.0.6.