CVE-2026-28808Network attack vector

Unauthenticated CGI execution via ScriptAlias path mismatch

Published Apr 7, 2026 · Updated Apr 7, 2026

Incorrect authorization in Erlang/OTP inets httpd allows remote attackers to execute protected CGI scripts without authentication. mod_alias omits script_alias mappings when mod_auth resolves a request, so authorization checks the DocumentRoot-relative path while mod_cgi executes the external mapped target. Exploitation requires inets httpd with script_alias targeting outside DocumentRoot and directory-based mod_auth rules; successful requests run the protected CGI program and expose its output or actions.

CVSS severity8.3
High
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Erlang/OTP inets httpd allows remote attackers to execute protected CGI scripts without authentication. mod_alias omits script_alias mappings when mod_auth resolves a request, so authorization checks the DocumentRoot-relative path while mod_cgi executes the external mapped target. Exploitation requires inets httpd with script_alias targeting outside DocumentRoot and directory-based mod_auth rules; successful requests run the protected CGI program and expose its output or actions.

The record

CVE
CVE-2026-28808
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
Erlang
Product
Erlang/OTP
Classifications
CWE-551, CWE-863, CAPEC-1, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=07b8f441ca711f9812fad9e9115bab3c3aa92f79 <* changes=[{"at":"8fc71ac6af4fbcc54103bec2983ef22e82942688","status":"unaffected"},{"at":"9dfa0c51eac97866078e808dec2183cb7871ff7c","status":"unaffected"}]
  2. Affected versionversion=17.0 <* changes=[{"at":"28.4.2","status":"unaffected"},{"at":"27.3.4.10","status":"unaffected"},{"at":"26.2.5.19","status":"unaffected"}]
  3. Affected versionversion=5.10 <* changes=[{"at":"9.6.2","status":"unaffected"},{"at":"9.3.2.4","status":"unaffected"},{"at":"9.1.0.6","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Erlang · Erlang/OTPversion=07b8f441ca711f9812fad9e9115bab3c3aa92f79 <* changes=[{"at":"8fc71ac6af4fbcc54103bec2983ef22e82942688","status":"unaffected"},{"at":"9dfa0c51eac97866078e808dec2183cb7871ff7c","status":"unaffected"}]; version=17.0 <* changes=[{"at":"28.4.2","status":"unaffected"},{"at":"27.3.4.10","status":"unaffected"},{"at":"26.2.5.19","status":"unaffected"}]; version=5.10 <* changes=[{"at":"9.6.2","status":"unaffected"},{"at":"9.3.2.4","status":"unaffected"},{"at":"9.1.0.6","status":"unaffected"}]

Published CVSS scores

7.4Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.3Erlang Ecosystem FoundationCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-551Incorrect Behavior Order: Authorization Before Parsing and Canonicalization
CWE-863Incorrect Authorization
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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