CVE-2026-28808

Discovered by AISLEPUBLISHEDCWE-863

Description

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 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.

CVSS Base Scores

CVSS v4.08.3

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

Affected Products

VendorProductVersionStatus
ErlangOTP5.10affected
ErlangOTP17.0—
ErlangOTP07b8f441ca711f9812fad9e9115bab3c3aa92f79—

Credits

  • Igor Morgenstern / Aisle Research(reporter)
  • Konrad Pietrzak(remediation developer)

References