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CVE-2026-43890

Outline is a service that allows for collaborative documentation. From 0.84.0 to 1.7.0, the subscriptions.create API endpoint in server/routes/api/subscriptions/subscriptions.ts exhibits a broken authorization pattern. When both collectionId and documentId are supplied in the request, the route handler authorizes ONLY the collection branch (line 125 if (collectionId)), while the downstream subscriptionCreator command at server/commands/subscriptionCreator.ts writes the subscription against the d
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:8aa819d0043c542377e03fd85043f436ad0f4811d7d837aace448b469878513b
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"outline","vendor":"outline","versions":[{"status":"affected","version":">= 0.82.1, < 1.7.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:86ca74ebec2b0c1ae81a0373e5b7b6b02df0a11d81c7ca8c4e8e7809fbebcf8c · sha256:ae2a381f555bcf5f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":7.7,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:86ca74ebec2b0c1ae81a0373e5b7b6b02df0a11d81c7ca8c4e8e7809fbebcf8c · sha256:ae2a381f555bcf5f… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:86ca74ebec2b0c1ae81a0373e5b7b6b02df0a11d81c7ca8c4e8e7809fbebcf8c · sha256:ae2a381f555bcf5f… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/outline/outline/security/advisories/GHSA-gf8h-cv9v-q4fw","tags":["x_refsource_CONFIRM"],"url":"https://github.com/outline/outline/security/advisories/GHSA-gf8h-cv9v-q4fw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86ca74ebec2b0c1ae81a0373e5b7b6b02df0a11d81c7ca8c4e8e7809fbebcf8c · sha256:ae2a381f555bcf5f… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/outline/outline/security/advisories/GHSA-gf8h-cv9v-q4fw"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:86ca74ebec2b0c1ae81a0373e5b7b6b02df0a11d81c7ca8c4e8e7809fbebcf8c · sha256:ae2a381f555bcf5f… · /containers/adp/0/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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