Incorrect authorization in Erlang OTP - CVE-2026-74994

Vulnerability identifier: #VU146841

CSH Severity: Low

CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-74994

CWE-ID: CWE-863

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote user to bypass directory-specific authorization controls.

The vulnerability exists due to incorrect authorization in the mod_auth module when processing authentication for multiple directory configuration blocks with dets or mnesia backends. A remote user can use valid credentials for one protected path to access other protected paths on the same httpd instance to bypass directory-specific authorization controls.

Only deployments configured with dets or mnesia authentication backends and two or more directory blocks with different require_user or require_group settings are vulnerable. Deployments using the plain authentication backend or a single directory block are not affected.

Erlang OTP
PowerVC
openEuler
erlang-syntax_tools
erlang-edoc
erlang-diameter
erlang-dialyzer
erlang-debugsource
erlang-debuginfo
erlang-debugger
erlang-crypto
erlang-compiler
erlang-common_test
erlang-asn1
erlang
erlang-xmerl
erlang-wx
erlang-tools
erlang-tftp
erlang-eldap
erlang-stdlib
erlang-ssl
erlang-ssh
erlang-src
erlang-snmp
erlang-sasl
erlang-runtime_tools
erlang-reltool
erlang-public_key
erlang-parsetools
erlang-os_mon
erlang-odbc
erlang-observer
erlang-mnesia
erlang-megaco
erlang-kernel
erlang-jinterface
erlang-inets
erlang-ftp
erlang-examples
erlang-eunit
erlang-et
erlang-erts
erlang-erl_interface
erlang-erl_docgen

Install security update from vendor's website.

Erlang OTP - addressed in versions 27.3.4.17, 28.5.0.6, 29.0.6
erlang-syntax_tools - update to 25.3.2.6-20
erlang-edoc - update to 25.3.2.6-20
erlang-diameter - update to 25.3.2.6-20
erlang-dialyzer - update to 25.3.2.6-20
erlang-debugsource - update to 25.3.2.6-20
erlang-debuginfo - update to 25.3.2.6-20
erlang-debugger - update to 25.3.2.6-20
erlang-crypto - update to 25.3.2.6-20
erlang-compiler - update to 25.3.2.6-20
erlang-common_test - update to 25.3.2.6-20
erlang-asn1 - update to 25.3.2.6-20
erlang - update to 25.3.2.6-20
erlang-xmerl - update to 25.3.2.6-20
erlang-wx - update to 25.3.2.6-20
erlang-tools - update to 25.3.2.6-20
erlang-tftp - update to 25.3.2.6-20
erlang-eldap - update to 25.3.2.6-20
erlang-stdlib - update to 25.3.2.6-20
erlang-ssl - update to 25.3.2.6-20
erlang-ssh - update to 25.3.2.6-20
erlang-src - update to 25.3.2.6-20
erlang-snmp - update to 25.3.2.6-20
erlang-sasl - update to 25.3.2.6-20
erlang-runtime_tools - update to 25.3.2.6-20
erlang-reltool - update to 25.3.2.6-20
erlang-public_key - update to 25.3.2.6-20
erlang-parsetools - update to 25.3.2.6-20
erlang-os_mon - update to 25.3.2.6-20
erlang-odbc - update to 25.3.2.6-20
erlang-observer - update to 25.3.2.6-20
erlang-mnesia - update to 25.3.2.6-20
erlang-megaco - update to 25.3.2.6-20
erlang-kernel - update to 25.3.2.6-20
erlang-jinterface - update to 25.3.2.6-20
erlang-inets - update to 25.3.2.6-20
erlang-ftp - update to 25.3.2.6-20
erlang-examples - update to 25.3.2.6-20
erlang-eunit - update to 25.3.2.6-20
erlang-et - update to 25.3.2.6-20
erlang-erts - update to 25.3.2.6-20
erlang-erl_interface - update to 25.3.2.6-20
erlang-erl_docgen - update to 25.3.2.6-20

• https://github.com/erlang/otp/security/advisories/GHSA-c3cq-q8x6-547g

• Multiple vulnerabilities in Erlang OTP
• openEuler 24.03 LTS SP4 update for erlang
• openEuler 24.03 LTS SP3 update for erlang
• openEuler 24.03 LTS SP1 update for erlang
• Multiple vulnerabilities in IBM PowerVC