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.
References
| Link | Resource |
|---|---|
| https://cna.erlef.org/cves/CVE-2026-28808.html | Vendor Advisory Mitigation |
| https://github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688 | Patch |
| https://github.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7c | Patch |
| https://github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3f | Third Party Advisory |
| https://osv.dev/vulnerability/EEF-CVE-2026-28808 | Third Party Advisory Patch |
| https://www.erlang.org/doc/system/versions.html#order-of-versions | Product |
Configurations
Configuration 1 (hide)
|
History
23 Apr 2026, 17:39
| Type | Values Removed | Values Added |
|---|---|---|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 9.8 |
| References | () https://cna.erlef.org/cves/CVE-2026-28808.html - Vendor Advisory, Mitigation | |
| References | () https://github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688 - Patch | |
| References | () https://github.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7c - Patch | |
| References | () https://github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3f - Third Party Advisory | |
| References | () https://osv.dev/vulnerability/EEF-CVE-2026-28808 - Third Party Advisory, Patch | |
| References | () https://www.erlang.org/doc/system/versions.html#order-of-versions - Product | |
| CPE | cpe:2.3:a:erlang:erlang\/otp:*:*:*:*:*:*:*:* cpe:2.3:a:erlang:erlang\/inets:*:*:*:*:*:*:*:* |
|
| First Time |
Erlang erlang\/inets
Erlang Erlang erlang\/otp |
07 Apr 2026, 13:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-04-07 13:16
Updated : 2026-04-23 17:39
NVD link : CVE-2026-28808
Mitre link : CVE-2026-28808
CVE.ORG link : CVE-2026-28808
JSON object : View
Products Affected
erlang
- erlang\/inets
- erlang\/otp
CWE
CWE-863
Incorrect Authorization