SecuriTricks - CVE-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.

Product(s) Impacted

Vendor	Product	Versions
Erlang	Otp Inets	17.0-28.4.2, 26.2.5.19, 27.3.4.10 5.10-9.6.2, 9.3.2.4, 9.1.0.6

Weaknesses

Common security weaknesses mapped to this vulnerability.

CWE-863

Incorrect Authorization

The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.

*CPE(s)

Affected systems and software identified for this CVE.

Type	Vendor	Product	Version	Update	Edition	Language	Software Edition	Target Software	Target Hardware	Other Information
a	erlang	otp	17.0-28.4.2	/	/	/	/	/	/	/
a	erlang	inets	5.10-9.6.2	/	/	/	/	/	/	/
a	erlang	inets	9.3.2.4	/	/	/	/	/	/	/
a	erlang	inets	9.1.0.6	/	/	/	/	/	/	/
a	erlang	otp	26.2.5.19	/	/	/	/	/	/	/
a	erlang	otp	27.3.4.10	/	/	/	/	/	/	/

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

CVSS Score

8.3 / 10

CVSS Data - 4.0

Attack Vector: NETWORK
Attack Complexity: LOW
Attack Requirements: PRESENT
Privileges Required: NONE
User Interaction: NONE
Scope:
Confidentiality Impact: HIGH
Integrity Impact: LOW
Availability Impact: NONE
Exploit Maturity: NOT_DEFINED

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

View Vector String

Timeline

Published: April 7, 2026, 1:16 p.m.
Last Modified: April 7, 2026, 1:20 p.m.

Status : Undergoing Analysis

CVE has been marked for Analysis. Normally once in this state the CVE will be analyzed by NVD staff within 24 hours.

More info

Source

6b3ad84c-e1a6-4bf7-a703-f496b71e49db

CVE-2026-28808