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 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.
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Affected products
5- osv-coords2 versionspkg:rpm/opensuse/erlang&distro=openSUSE%20Leap%2016.0pkg:rpm/opensuse/erlang27&distro=openSUSE%20Tumbleweed
< 27.1.3-160000.4.1+ 1 more
- (no CPE)range: < 27.1.3-160000.4.1
- (no CPE)range: < 27.1.3-2.1
Patches
Vulnerability mechanics
References
9- github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688nvdPatch
- github.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7cnvdPatch
- osv.dev/vulnerability/EEF-CVE-2026-28808nvdPatchThird Party Advisory
- cna.erlef.org/cves/CVE-2026-28808.htmlnvdMitigationVendor Advisory
- github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3fnvdThird Party Advisory
- www.erlang.org/doc/system/versions.htmlnvdProduct
- access.redhat.com/security/cve/CVE-2026-28808nvd
- bugzilla.redhat.com/show_bug.cginvd
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28808.jsonnvd
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