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CVE-2026-31834

Umbraco is an ASP.NET CMS. From 15.3.1 to before 16.5.1 and 17.2.2, A privilege escalation vulnerability has been identified in Umbraco CMS. Under certain conditions, authenticated backoffice users with permission to manage users, may be able to elevate their privileges due to insufficient authorization enforcement when modifying user group memberships. The affected functionality does not properly validate whether a user has sufficient privileges to assign highly privileged roles. This vulnerabi
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d8d95c6b5a950e1583abb27b6fae545c0fadf3553692ff84512f6d8cf63510d3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cwe · 3 assertions

{"cweId":"CWE-284","description":"CWE-284: Improper Access Control","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f8f3d945cd2b94f7d40c4978013be868c555e14e114f54d72338641f5340907a · sha256:d839ff0cfb5ec07f… · /containers/cna/problemTypes/1/descriptions/0

{"cweId":"CWE-269","description":"CWE-269: Improper Privilege Management","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f8f3d945cd2b94f7d40c4978013be868c555e14e114f54d72338641f5340907a · sha256:d839ff0cfb5ec07f… · /containers/cna/problemTypes/0/descriptions/0

{"cweId":"CWE-862","description":"CWE-862: Missing Authorization","lang":"en","type":"CWE"}

  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f8f3d945cd2b94f7d40c4978013be868c555e14e114f54d72338641f5340907a · sha256:d839ff0cfb5ec07f… · /containers/cna/problemTypes/2/descriptions/0

Affected products and versions

1 source assertion
{"product":"Umbraco-CMS","vendor":"umbraco","versions":[{"status":"affected","version":">= 15.3.1, < 16.5.1"},{"status":"affected","version":">= 17.0.0, < 17.2.1"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:f8f3d945cd2b94f7d40c4978013be868c555e14e114f54d72338641f5340907a · sha256:d839ff0cfb5ec07f… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.2,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"HIGH","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:f8f3d945cd2b94f7d40c4978013be868c555e14e114f54d72338641f5340907a · sha256:d839ff0cfb5ec07f… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

3 source assertions
{"cweId":"CWE-284","description":"CWE-284: Improper Access Control","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f8f3d945cd2b94f7d40c4978013be868c555e14e114f54d72338641f5340907a · sha256:d839ff0cfb5ec07f… · /containers/cna/problemTypes/1/descriptions/0
{"cweId":"CWE-269","description":"CWE-269: Improper Privilege Management","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f8f3d945cd2b94f7d40c4978013be868c555e14e114f54d72338641f5340907a · sha256:d839ff0cfb5ec07f… · /containers/cna/problemTypes/0/descriptions/0
{"cweId":"CWE-862","description":"CWE-862: Missing Authorization","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:f8f3d945cd2b94f7d40c4978013be868c555e14e114f54d72338641f5340907a · sha256:d839ff0cfb5ec07f… · /containers/cna/problemTypes/2/descriptions/0

Source references

1 source assertion
{"name":"https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-rhcg-3h8r-v6vp","tags":["x_refsource_CONFIRM"],"url":"https://github.com/umbraco/Umbraco-CMS/security/advisories/GHSA-rhcg-3h8r-v6vp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:f8f3d945cd2b94f7d40c4978013be868c555e14e114f54d72338641f5340907a · sha256:d839ff0cfb5ec07f… · /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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