High 8.3Published Apr 7, 2026

CVE-2026-28808ScriptAlias CGI targets bypass directory auth in inets httpd (mod_auth vs mod_cgi path mismatch)

Updated under an hour ago (Oct 26, 2026, 7:00 PM ET)

Does this affect you?

It affects Erlang OTP and 2 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Erlang OTP

Exploited in the last 30 days

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.

CVSS: 8.3 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-863, CWE-551
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: EEF
NVD analysis: Modified
Record last updated: Sep 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Erlang OTP erlang:erlang/otp	from 17.0; fixed at 26.2.5.19, fixed at 27.3.4.10, fixed at 28.4.2	CNA record
Red Hat Red Hat OpenStack Platform 16.2 redhat:openstack	16.2	CISA ADP
erlang erlang/inets erlang:erlang/inets	from 5.10 before 9.1.0.6; after 9.2 before 9.3.2.4; after 9.4 before 9.6.2	NVD
erlang erlang/otp erlang:erlang/otp	from 17.0 before 26.2.5.19; from 27.0 before 27.3.4.10; from 28.0 before 28.4.2	NVD

References

References

https://github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3f	related, vendor-advisory, third-party-advisory
https://cna.erlef.org/cves/CVE-2026-28808.html	related, mitigation, vendor-advisory
https://osv.dev/vulnerability/EEF-CVE-2026-28808	related, patch, third-party-advisory
https://www.erlang.org/doc/system/versions.html#order-of-versions	x-version-scheme, product
https://github.com/erlang/otp/commit/07b8f441ca711f9812fad9e9115bab3c3aa92f79	related
https://github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688	patch
https://github.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7c	patch
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.