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CVE-2026-28808

ScriptAlias CGI targets bypass directory auth in inets httpd (mod_auth vs mod_cgi path mismatch)

Published: Apr 7, 2026Updated: Jun 30, 2026 Sources: CVE List NVDCWE-863
9.8CRITICAL
NVD MITRE
EPSS Score
0.5%
Top 59.3%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-863CWE-551

Affected Products

Erlang
oss-projectaka erlang/otp, erlang/ssh, otp
OTPLibraryLibrary
OSS Libraries / generic-library
erlang\/inetsLibraryLibrary
OSS Libraries / generic-library
erlang\/otpLibraryLibrary
OSS Libraries / generic-library

Exploitability

Official Patch Available
Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques
Initial Access
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References

https://github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3f
github.com
https://cna.erlef.org/cves/CVE-2026-28808.html
cna.erlef.org
https://osv.dev/vulnerability/EEF-CVE-2026-28808
osv.dev
and 6 more references View all →
News mentions
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