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CVE-2026-53609

ApostropheCMS is an open-source Node.js content management system. In versions up to and including 4.30.0, `apos.util.set()` traverses dot-notation paths without sanitizing `__proto__`, allowing an authenticated editor to write arbitrary values to `Object.prototype` via the `$pullAll` patch operator. A confirmed gadget in `publicApiCheck()` causes this to bypass authorization on all piece-type REST API endpoints for every subsequent unauthenticated request, for the lifetime of the Node.js proces
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:9238121aad92080478b23e2513fb6b6b495645a0fd346742707d0de1010ed9d3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"apostrophe","vendor":"apostrophecms","versions":[{"status":"affected","version":"<= 4.30.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:6706ed11b3469e45fc2786756397eaee904935efcc92327ac3d42e44419408c2 · sha256:4dabe9a1d79eefde… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":9.1,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:6706ed11b3469e45fc2786756397eaee904935efcc92327ac3d42e44419408c2 · sha256:4dabe9a1d79eefde… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-1321","description":"CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:6706ed11b3469e45fc2786756397eaee904935efcc92327ac3d42e44419408c2 · sha256:4dabe9a1d79eefde… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"name":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-6h5j-32cf-4253","tags":["x_refsource_CONFIRM"],"url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-6h5j-32cf-4253"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6706ed11b3469e45fc2786756397eaee904935efcc92327ac3d42e44419408c2 · sha256:4dabe9a1d79eefde… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-6h5j-32cf-4253"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:6706ed11b3469e45fc2786756397eaee904935efcc92327ac3d42e44419408c2 · sha256:4dabe9a1d79eefde… · /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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