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CVE-2026-28808

9.8 · CRITICAL

Incorrect Authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scripts protected by directory rules when served via script_alias.

Published Apr 7, 2026CWE-863EPSS 0.77%

Overview

CVE-2026-28808 is a critical-severity vulnerability. It was published on April 7, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refcna.erlef.org/cves/CVE-2026-28808.htmlGitHubgithub.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688GitHubgithub.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7cGitHubgithub.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3fRefosv.dev/vulnerability/EEF-CVE-2026-28808Refwww.erlang.org/doc/system/versions.html#order-of-versionsRefaccess.redhat.com/security/cve/CVE-2026-28808Refbugzilla.redhat.com/show_bug.cgi?id=2455909Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28808.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-28808?

CVE-2026-28808 is a critical-severity vulnerability. It was published on April 7, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-28808?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-28808?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-28808?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-28808 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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