CVE-2026-28808 Incorrect Authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scripts…
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 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 products and versions
| Product | Affected versions | Fixed in |
|---|---|---|
| otp | Versions not published | |
| Red Hat OpenStack Platform 16.2 | Versions not published | |
| Red Hat OpenStack Platform 17.1 | Versions not published | |
| Red Hat OpenStack Platform 18.0 | Versions not published |
References
- GitHub Advisory github.com
- EEF CNA record for CVE-2026-28808 cna.erlef.org
- OSV record EEF-CVE-2026-28808 osv.dev
- Erlang/OTP version ordering www.erlang.org
- Introducing commit 07b8f44 in erlang/otp github.com
- Fix commit 8fc71ac in erlang/otp github.com
- Fix commit 9dfa0c5 in erlang/otp github.com
Timeline
- Published
- Last modified