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CVE-2026-56668

ZITADEL is an open source identity management platform. Prior to 4.15.3, ZITADEL's OAuth2 Token Exchange endpoint for urn:ietf:params:oauth:grant-type:token-exchange does not verify that the subject token belongs to the requesting client or that requested scopes remain within the original token's scopes, allowing a low-privilege token to be exchanged for elevated permissions at another application. This issue is fixed in version 4.15.3.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8f4377d6d50fb878cbc55e758e511ec018b7dd3b232e5de77d2b8b10c9d5e046
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"zitadel","vendor":"zitadel","versions":[{"status":"affected","version":"< 4.15.3"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6f582e691245db954bee5b5639809bd09ebbf5f0044fbeeee7478fea096877d7 · sha256:fe69d055c7174bbd… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":8.1,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6f582e691245db954bee5b5639809bd09ebbf5f0044fbeeee7478fea096877d7 · sha256:fe69d055c7174bbd… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-862","description":"CWE-862: Missing Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6f582e691245db954bee5b5639809bd09ebbf5f0044fbeeee7478fea096877d7 · sha256:fe69d055c7174bbd… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"https://github.com/zitadel/zitadel/commit/e2886a61670ca8fd41c9434f87036546e5620bcc","tags":["x_refsource_MISC"],"url":"https://github.com/zitadel/zitadel/commit/e2886a61670ca8fd41c9434f87036546e5620bcc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6f582e691245db954bee5b5639809bd09ebbf5f0044fbeeee7478fea096877d7 · sha256:fe69d055c7174bbd… · /containers/cna/references/1
{"name":"https://github.com/zitadel/zitadel/releases/tag/v4.15.3","tags":["x_refsource_MISC"],"url":"https://github.com/zitadel/zitadel/releases/tag/v4.15.3"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6f582e691245db954bee5b5639809bd09ebbf5f0044fbeeee7478fea096877d7 · sha256:fe69d055c7174bbd… · /containers/cna/references/2
{"name":"https://github.com/zitadel/zitadel/security/advisories/GHSA-vrh8-c9cm-wh8v","tags":["x_refsource_CONFIRM"],"url":"https://github.com/zitadel/zitadel/security/advisories/GHSA-vrh8-c9cm-wh8v"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6f582e691245db954bee5b5639809bd09ebbf5f0044fbeeee7478fea096877d7 · sha256:fe69d055c7174bbd… · /containers/cna/references/0

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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