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Vulnerability record · CVE-2026-28808 · published 7 April 2026

CVE-2026-28808: Erlang\/inets incorrect authorization vulnerability

Erlang · Erlang\/Inets

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.

8.3 CVSS 4.0 High EPSS 0.77% · top 46.1% CWE-863 · Incorrect authorizationCWE-551 · CWE-551
8.3CVSS 4.0 base score
0.77%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
10References
8 Sep 2026Last modified by NVD

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 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: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:

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://cna.erlef.org/cves/CVE-2026-28808.html MitigationVendor Advisory
https://github.com/erlang/otp/commit/07b8f441ca711f9812fad9e9115bab3c3aa92f79
https://github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688 Patch
https://github.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7c Patch
https://github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3f Third Party Advisory
https://osv.dev/vulnerability/EEF-CVE-2026-28808 PatchThird Party Advisory
https://www.erlang.org/doc/system/versions.html#order-of-versions Product
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

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Source: NIST National Vulnerability Database (record CVE-2026-28808), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.