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CVE-2026-21621

Incorrect Authorization vulnerability in hexpm hexpm/hexpm ('Elixir.HexpmWeb.API.OAuthController' module) allows Privilege Escalation. An API key created with read-only permissions (domain: "api", resource: "read") can be escalated to full write access under specific conditions. When exchanging a read-only API key via the OAuth client_credentials grant, the resource qualifier is ignored. The resulting JWT receives the broad "api" scope instead of the expected "api:read" scope. This token is th
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:e3c359080879f596a4b4196a3d6d3ca74d2dbed5ad0c84f16a16e61f10135c3b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.HexpmWeb.API.OAuthController'"],"packageName":"hexpm/hexpm","packageURL":"pkg:github/hexpm/hexpm","product":"hexpm","programFiles":["lib/hexpm_web/controllers/api/oauth_controller.ex"],"programRoutines":[{"name":"'Elixir.HexpmWeb.API.OAuthController':validate_scopes_against_key/2"}],"repo":"https://github.com/hexpm/hexpm.git","vendor":"hexpm","versions":[{"lessThan":"71c127afebb7ed7cc637eb231b98feb802d62999","status":"affected","version":"71829cb6f6559bcceb1ef…

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/affected/0

{"defaultStatus":"unaffected","product":"hex.pm","vendor":"hexpm","versions":[{"lessThan":"2026-03-05","status":"affected","version":"2025-08-18","versionType":"date"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/affected/1

Affected products and versions

2 source assertions
{"collectionURL":"https://github.com","cpes":["cpe:2.3:a:hexpm:hexpm:*:*:*:*:*:*:*:*"],"defaultStatus":"unaffected","modules":["'Elixir.HexpmWeb.API.OAuthController'"],"packageName":"hexpm/hexpm","packageURL":"pkg:github/hexpm/hexpm","product":"hexpm","programFiles":["lib/hexpm_web/controllers/api/oauth_controller.ex"],"programRoutines":[{"name":"'Elixir.HexpmWeb.API.OAuthController':validate_scopes_against_key/2"}],"repo":"https://github.com/hexpm/hexpm.git","vendor":"hexpm","versions":[{"lessThan":"71c127afebb7ed7cc637eb231b98feb802d62999","status":"affected","version":"71829cb6f6559bcceb1ef…
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/affected/0
{"defaultStatus":"unaffected","product":"hex.pm","vendor":"hexpm","versions":[{"lessThan":"2026-03-05","status":"affected","version":"2025-08-18","versionType":"date"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/affected/1

Provider-owned CVSS observations

1 source assertion
{"metric":{"Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":7,"baseSeverity":"HIGH","exploitMaturity":"NOT_DEFINED","privilegesRequired":"LOW","providerUrgency":"NOT_DEFINED","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"HIGH","userInteraction":"NONE","valueDensity":"NOT_DEFINED","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"N…
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-863","description":"CWE-863 Incorrect Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"tags":["related"],"url":"https://cna.erlef.org/cves/CVE-2026-21621.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/references/1
{"tags":["patch"],"url":"https://github.com/hexpm/hexpm/commit/71c127afebb7ed7cc637eb231b98feb802d62999"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/references/3
{"tags":["vendor-advisory","related"],"url":"https://github.com/hexpm/hexpm/security/advisories/GHSA-739m-8727-j6w3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/references/0
{"tags":["related"],"url":"https://osv.dev/vulnerability/EEF-CVE-2026-21621"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:452366b56afbc0b348c27fba28f522986fcdf5956385c38acc2df129fd851cec · sha256:c6a39f5a6eff0a46… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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