PT-2026-23497 · Hexpm · Hexpm

Realcorvus

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Published

2026-03-05

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Updated

2026-03-05

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CVE-2026-21621

CVSS v4.0

7.0

High

VectorAV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:H/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
Name of the Vulnerable Software and Affected Versions hexpm versions prior to 71c127afebb7ed7cc637eb231b98feb802d62999
Description A flaw exists in the authorization process within the 'Elixir.HexpmWeb.API.OAuthController' module of hexpm, potentially leading to privilege escalation. Specifically, when exchanging a read-only API key using the OAuth client credentials grant, the intended resource qualifier is disregarded. This results in a JWT being issued with broad "api" scope instead of the expected "api:read" scope. Consequently, the token is treated as having full API access. An attacker who obtains a victim's read-only API key and a valid TOTP code can exploit this to generate a new, unrestricted full-access API key that does not expire by default, enabling write operations like publishing, retiring, or modifying packages. The issue is associated with the program files lib/hexpm web/controllers/api/oauth controller.ex and the Elixir.HexpmWeb.API.OAuthController:validate scopes against key/2 routine.
Recommendations Update to version 71c127afebb7ed7cc637eb231b98feb802d62999 or later to address the incorrect scope assignment during OAuth token exchange.

Fix

LPE

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-21621
GHSA-739M-8727-J6W3

Affected Products

Hexpm