CVE-2026-28808 (GCVE-0-2026-28808)
Vulnerability from cvelistv5 – Published: 2026-04-07 12:28 – Updated: 2026-04-07 14:38
VLAI?
Title
ScriptAlias CGI targets bypass directory auth in inets httpd (mod_auth vs mod_cgi path mismatch)
Summary
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.
Severity ?
CWE
- CWE-863 - Incorrect Authorization
Assigner
References
| URL | Tags | |
|---|---|---|
|
|
||
Impacted products
Credits
Igor Morgenstern / Aisle Research
Konrad Pietrzak
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\"value\": \"\u003cul\u003e\u003cli\u003eMove CGI scripts inside \u003ctt\u003eDocumentRoot\u003c/tt\u003e and use \u003ctt\u003ealias\u003c/tt\u003e instead of \u003ctt\u003escript_alias\u003c/tt\u003e to ensure \u003ctt\u003emod_auth\u003c/tt\u003e resolves the correct path.\u003c/li\u003e\u003cli\u003eApply URL-based access controls at a reverse proxy layer to block unauthenticated access to the \u003ctt\u003escript_alias\u003c/tt\u003e URL prefix.\u003c/li\u003e\u003cli\u003eRemove \u003ctt\u003emod_cgi\u003c/tt\u003e from the httpd modules chain if CGI functionality is not required.\u003c/li\u003e\u003c/ul\u003e\", \"base64\": false}]}], \"x_generator\": {\"engine\": \"Vulnogram 0.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"Incorrect Authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scripts protected by directory rules when served via script_alias.\\n\\nWhen 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.\\n\\nThis 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.\\n\\nThis 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.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"Incorrect Authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scripts protected by \u003ctt\u003edirectory\u003c/tt\u003e rules when served via \u003ctt\u003escript_alias\u003c/tt\u003e.\u003cp\u003eWhen \u003ctt\u003escript_alias\u003c/tt\u003e maps a URL prefix to a directory outside \u003ctt\u003eDocumentRoot\u003c/tt\u003e, \u003ctt\u003emod_auth\u003c/tt\u003e evaluates \u003ctt\u003edirectory\u003c/tt\u003e-based access controls against the \u003ctt\u003eDocumentRoot\u003c/tt\u003e-relative path while \u003ctt\u003emod_cgi\u003c/tt\u003e executes the script at the \u003ctt\u003eScriptAlias\u003c/tt\u003e-resolved path. This path mismatch allows unauthenticated access to CGI scripts that \u003ctt\u003edirectory\u003c/tt\u003e rules were meant to protect.\u003c/p\u003e\u003cp\u003eThis vulnerability is associated with program files \u003ctt\u003elib/inets/src/http_server/mod_alias.erl\u003c/tt\u003e, \u003ctt\u003elib/inets/src/http_server/mod_auth.erl\u003c/tt\u003e, and \u003ctt\u003elib/inets/src/http_server/mod_cgi.erl\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eThis 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.\u003c/p\u003e\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-863\", \"description\": \"CWE-863 Incorrect Authorization\"}]}], \"configurations\": [{\"lang\": \"en\", \"value\": \"The inets httpd server must use script_alias to map a URL prefix to a CGI directory, combined with directory-based access controls (e.g., mod_auth) protecting the script_alias target path. The vulnerability applies whenever the script_alias target path differs from DocumentRoot + URL prefix.\", \"supportingMedia\": [{\"type\": \"text/html\", \"value\": \"The inets httpd server must use \u003ctt\u003escript_alias\u003c/tt\u003e to map a URL prefix to a CGI directory, combined with \u003ctt\u003edirectory\u003c/tt\u003e-based access controls (e.g., \u003ctt\u003emod_auth\u003c/tt\u003e) protecting the \u003ctt\u003escript_alias\u003c/tt\u003e target path. The vulnerability applies whenever the \u003ctt\u003escript_alias\u003c/tt\u003e target path differs from \u003ctt\u003eDocumentRoot\u003c/tt\u003e + URL prefix.\", \"base64\": false}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"26.2.5.19\", \"versionStartIncluding\": \"17.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"27.3.4.10\", \"versionStartIncluding\": \"27.0\"}, {\"criteria\": \"cpe:2.3:a:erlang:erlang\\\\/otp:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"28.4.2\", \"versionStartIncluding\": \"28.0\"}], \"operator\": \"OR\"}], \"operator\": \"AND\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-04-07T14:38:09.190Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2026-28808\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-04-07T14:38:09.190Z\", \"dateReserved\": \"2026-03-03T14:40:00.590Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-04-07T12:28:16.056Z\", \"assignerShortName\": \"EEF\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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