CVE Explorer

CVE-2026-21896

Kirby is an open-source content management system. From versions 5.0.0 to 5.2.1, Kirby is missing permission checks in the content changes API. This vulnerability affects all Kirby sites where user permissions are configured to prevent specific role(s) from performing write actions, specifically by disabling the update permission with the intent to prevent modifications to site content. This vulnerability does not affect those who have not altered the deviated from default user permissions. This

Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:d084ef2fc30c82e40713e2cdf7b817c5324e64495a03359d1893b8274e3942ce

Known exploited

Not asserted

Disputed

Stale source

Conflicts

Affected products and versions

1 source assertion

{"product":"kirby","vendor":"getkirby","versions":[{"status":"affected","version":">= 5.0.0, < 5.2.2"}]}

cve_program_cvelist_v5affected
urn:baitaphish:normalized-source-record:v2:6faa54d44a82a8521fe0b2b23ec4876fa17c4ef88558bf3267ea0ec1b06ccdaf · sha256:beff78847401b635… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion

{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":5.8,"baseSeverity":"MEDIUM","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"ACTIVE","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}

cve_program_cvelist_v5cvss
urn:baitaphish:normalized-source-record:v2:6faa54d44a82a8521fe0b2b23ec4876fa17c4ef88558bf3267ea0ec1b06ccdaf · sha256:beff78847401b635… · /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:v2:6faa54d44a82a8521fe0b2b23ec4876fa17c4ef88558bf3267ea0ec1b06ccdaf · sha256:beff78847401b635… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions

{"name":"https://github.com/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af47","tags":["x_refsource_MISC"],"url":"https://github.com/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af47"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6faa54d44a82a8521fe0b2b23ec4876fa17c4ef88558bf3267ea0ec1b06ccdaf · sha256:beff78847401b635… · /containers/cna/references/1

{"name":"https://github.com/getkirby/kirby/releases/tag/5.2.2","tags":["x_refsource_MISC"],"url":"https://github.com/getkirby/kirby/releases/tag/5.2.2"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6faa54d44a82a8521fe0b2b23ec4876fa17c4ef88558bf3267ea0ec1b06ccdaf · sha256:beff78847401b635… · /containers/cna/references/2

{"name":"https://github.com/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2f","tags":["x_refsource_CONFIRM"],"url":"https://github.com/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2f"}

cve_program_cvelist_v5reference
urn:baitaphish:normalized-source-record:v2:6faa54d44a82a8521fe0b2b23ec4876fa17c4ef88558bf3267ea0ec1b06ccdaf · sha256:beff78847401b635… · /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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