CVE-2026-28808CRITICAL 9.8EPSS p38.5%
CVE-2026-28808CVE-2026-28808
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.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 0.50% probability of exploitation · percentile 38.5% · 2026-06-19T12:03:05Z |
| Published | 2026-04-07 |
| Last modified | 2026-04-23 |
Underlying weaknesses· 1
References
- https://cna.erlef.org/cves/CVE-2026-28808.html
- https://github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688
- https://github.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7c
- https://github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3f
- https://osv.dev/vulnerability/EEF-CVE-2026-28808
- https://www.erlang.org/doc/system/versions.html#order-of-versions
1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Incorrect Authorizationcwe-863 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.