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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.

PUBLISHED Reserved 2026-03-03 | Published 2026-04-07 | Updated 2026-04-07 | Assigner EEF




HIGH: 8.3CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-863 Incorrect Authorization

Product status

Default status
affected

5.10 (otp) before *
affected

Default status
affected

17.0 (otp) before *
affected

07b8f441ca711f9812fad9e9115bab3c3aa92f79 (git) before *
affected

Credits

Igor Morgenstern / Aisle Research reporter

Konrad Pietrzak remediation developer

References

github.com/...ng/otp/security/advisories/GHSA-3vhp-h532-mc3f vendor-advisory related

cna.erlef.org/cves/CVE-2026-28808.html related

osv.dev/vulnerability/EEF-CVE-2026-28808 related

www.erlang.org/doc/system/versions.html

github.com/...ommit/8fc71ac6af4fbcc54103bec2983ef22e82942688 patch

github.com/...ommit/9dfa0c51eac97866078e808dec2183cb7871ff7c patch

cve.org (CVE-2026-28808)

nvd.nist.gov (CVE-2026-28808)

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