---
cve: "CVE-2026-28808"
severity: "HIGH"
cvss: 8.3
epss: "54%"
vendor: "erlang"
kev: false
exploited: false
published: "2026-04-07 13:16:46"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-13T04:46:06+02:00"
---

# CVE-2026-28808

> 8.3 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- cdb375af6b456946b1ff3fc993d122018f20b031 (Commit)
- 0aa261a7765c9698aabc7f7c5be878a8850a9c5f (Commit)

## Referenzen

- <https://github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3f>
- <https://cna.erlef.org/cves/CVE-2026-28808.html>
- <https://osv.dev/vulnerability/EEF-CVE-2026-28808>
- <https://www.erlang.org/doc/system/versions.html#order-of-versions>
- <https://github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688>
- <https://github.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7c>
- <https://github.com/erlang/otp/commit/07b8f441ca711f9812fad9e9115bab3c3aa92f79>
- <https://access.redhat.com/security/cve/CVE-2026-28808>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2455909>
- <https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28808.json>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-28808) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_