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Review reviewHigh

CVE-2026-28808

Erlang OTP, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1

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_alia...

CVSS
8.3
EPSS
0.54%
42.5% percentile
CISA KEV
Not listed
Published
2026.04.07
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.54%
Technical severityCVSS 8.3

Vulnerability overview

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_alia...

Affected product and versions

Product
Erlang OTP, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1
Affected versions
>= 5.10, >= 17.0, >= 07b8f441ca711f9812fad9e9115bab3c3aa92f79, >= 5.10 < 9.1.0.6, > 9.2 < 9.3.2.4, > 9.4 < 9.6.2, >= 17.0 < 26.2.5.19, >= 27.0 < 27.3.4.10, >= 28.0 < 28.4.2
Fixed versions
9.1.0.6, 9.3.2.4, 9.6.2, 26.2.5.19, 27.3.4.10, 28.4.2

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Erlang OTP, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
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:X/V:X/RE:X/U:X
CWE
CWE-551, CWE-863
CVE-2026-28808 — Erlang OTP, Red Hat OpenStack Platform 16.2, Red Hat OpenStack Platform 17.1 | SECUFOCUS NOW