CVE-2026-28808

HIGHCVSS 7.49.8▲
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.0%, top 89% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Trending — 3 sources updated this week
7.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 7.4Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
7.4
EG Score
9.8(medium)
EPSS
41.2%
KEV
Not listed

Published

April 7, 2026

Last Modified

July 15, 2026

Advisory Details (9)

Auto-updated Jun 30, 2026
Patch available. Sources: github_commit, github, redhat.
redhat
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28808.json
redhat Patch Available

2455909 – (CVE-2026-28808) CVE-2026-28808 erlang/otp: inets: Erlang OTP inets modules: Unauthenticated access to protected CGI scripts via incorrect authorization

https://bugzilla.redhat.com/show_bug.cgi?id=2455909
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-28808
generic

Versions — Erlang System Documentation v29.0.2

https://www.erlang.org/doc/system/versions.html#order-of-versions
generic

OSV - Open Source Vulnerabilities

https://osv.dev/vulnerability/EEF-CVE-2026-28808
github Patch Available

ScriptAlias CGI targets bypass `directory` auth (mod_auth vs mod_cgi path mismatch) · Advisory · erlang/otp · GitHub

https://github.com/erlang/otp/security/advisories/GHSA-3vhp-h532-mc3f
github_commit

commit 9dfa0c51eac9 (erlang/otp)

Fix landed in erlang/otp commit 9dfa0c51eac9 — awaiting tagged release

https://github.com/erlang/otp/commit/9dfa0c51eac97866078e808dec2183cb7871ff7c
github_commit

commit 8fc71ac6af4f (erlang/otp)

Fix landed in erlang/otp commit 8fc71ac6af4f — awaiting tagged release

https://github.com/erlang/otp/commit/8fc71ac6af4fbcc54103bec2983ef22e82942688
generic

ScriptAlias CGI targets bypass directory auth in inets httpd (mod_auth vs mod_cgi path mismatch) | Erlang Ecosystem Foundation CNA

https://cna.erlef.org/cves/CVE-2026-28808.html

Vendor Advisories for CVE-2026-28808(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 12× in last 7d / 47× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 128 total refreshes for this CVE.

  1. 2026-07-15 16:57 UTCEPSS rescore
  2. 2026-07-15 16:57 UTCEPSS rescore
  3. 2026-07-15 04:19 UTCMITRE cvelistV5CVSS v3 → 7.4 · severity → HIGH
  4. 2026-07-15 02:23 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
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  20. 2026-07-03 17:46 UTCMITRE cvelistV5CVSS v3 → 7.4 · severity → HIGH
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Frequently asked(5)

What is CVE-2026-28808?
CVE-2026-28808 is a high vulnerability published on April 7, 2026. Incorrect Authorization vulnerability in Erlang OTP (inets modules) allows unauthenticated access to CGI scripts protected by directory rules when served via script_alias. When scriptalias maps a URL prefix to a directory outside DocumentRoot, modauth evaluates directory-based access controls…
When was CVE-2026-28808 disclosed?
CVE-2026-28808 was first published in the National Vulnerability Database on April 7, 2026, with the most recent update on July 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-28808 actively exploited?
CVE-2026-28808 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 41.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-28808?
CVE-2026-28808 has a CVSS v3 base score of 7.4 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.8.
How do I remediate CVE-2026-28808?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-28808, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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