CVE-2026-28808
Last modified
CVE-2026-28808 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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 28.4.2, OTP 27.3.4.10 and OTP 26.2.5.19, corresponding to inets from 5.10 before 9.6.2, 9.3.2.4 and 9.1.0.6.. EPSS estimates a 0.54% chance of exploitation in the next 30 days.
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 28.4.2, OTP 27.3.4.10 and OTP 26.2.5.19, corresponding to inets from 5.10 before 9.6.2, 9.3.2.4 and 9.1.0.6.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Erlang | Erlang\/Inets | >= 5.10, < 9.1.0.6 |
| Erlang | Erlang\/Inets | > 9.2, < 9.3.2.4 |
| Erlang | Erlang\/Inets | > 9.4, < 9.6.2 |
| Erlang | Erlang\/Otp | >= 17.0, < 26.2.5.19 |
| Erlang | Erlang\/Otp | >= 27.0, < 27.3.4.10 |
| Erlang | Erlang\/Otp | >= 28.0, < 28.4.2 |
References
- https://cna.erlef.org/cves/CVE-2026-28808.htmlMitigation, Vendor Advisory
- https://github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3fThird Party Advisory
- https://osv.dev/vulnerability/EEF-CVE-2026-28808Patch, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
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