CVE-2026-28808

HIGH EPSS 38.7%
Published Apr 7, 20262mo ago · Modified Jun 17, 20261w ago
8.3 CVSS 4.0
High
Find Similar
Published Apr 7, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
8.3
Exploitability
—
Impact
—
Vector string
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
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
38.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-863 Incorrect Authorization Authorization

Affected Products 6

VendorProductVersionRange
erlangerlang\/inets*≥5.10  –  <9.1.0.6
erlangerlang\/inets*>9.2  –  <9.3.2.4
erlangerlang\/inets*>9.4  –  <9.6.2
erlangerlang\/otp*≥17.0  –  <26.2.5.19
erlangerlang\/otp*≥27.0  –  <27.3.4.10
erlangerlang\/otp*≥28.0  –  <28.4.2

References 6

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

Remediation

  • github.com https://github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688
    Patch
  • github.com https://github.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7c
    Patch
  • osv.dev https://osv.dev/vulnerability/EEF-CVE-2026-28808
    PatchThird Party Advisory