CVE record · CVE-2026-21621

Improper Scope Enforcement in OAuth client_credentials Flow Allows Read-Only API Key to Escalate to Full Access

CVSS 7.0 HighEPSS 0.0037 · 31st percentile

Published by the CVE Program (CNA: EEF) at 5 Mar 2026, 19:20 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
hexpm	hexpm Package name: hexpm/hexpm https://github.com pkg:github/hexpm/hexpm	affected 71829cb6f6559bcceb1ef4e43a2fb8cdd3af654b to before 71c127afebb7ed7cc637eb231b98feb802d62999 git Other versions: unaffected
hexpm	hex.pm	affected 2025-08-18 to before 2026-03-05 date Other versions: unaffected

Identifiers: CVE-2026-21621
CNA: EEF
Weakness (CWE): CWE-863
Tags: hexpm
hexpm hex.pm
Broken access control
Published: 5 Mar 2026
Updated: 6 Apr 2026

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.0	High	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/SA:N	CNA (EEF)

CISA KEV Not listed.
EPSS 0.0037, the 31st percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 5 Mar 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/hexpm/hexpm/security/advisories/GHSA-739m-8727-j6w3 vendor-advisoryrelated
cna.erlef.org/cves/CVE-2026-21621.html related
osv.dev/vulnerability/EEF-CVE-2026-21621 related
github.com/hexpm/hexpm/commit/71c127afebb7ed7cc637eb231b98feb802d62999 patch

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.