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Vulnerability Details :

CVE-2026-21896

Summary
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
Published At-08 Jan, 2026 | 18:09
Updated At-08 Jan, 2026 | 18:20
Rejected At-
Credits

Kirby is missing permission checks in the content changes API

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 issue has been patched in version 5.2.2.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
â–¼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:GitHub_M
Assigner Org ID:a0819718-46f1-4df5-94e2-005712e83aaa
Published At:08 Jan, 2026 | 18:09
Updated At:08 Jan, 2026 | 18:20
Rejected At:
â–¼CVE Numbering Authority (CNA)
Kirby is missing permission checks in the content changes API

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 issue has been patched in version 5.2.2.

Affected Products
Vendor
getkirby
Product
kirby
Versions
Affected
  • >= 5.0.0, < 5.2.2
Problem Types
TypeCWE IDDescription
CWECWE-863CWE-863: Incorrect Authorization
Type: CWE
CWE ID: CWE-863
Description: CWE-863: Incorrect Authorization
Metrics
VersionBase scoreBase severityVector
4.05.8MEDIUM
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
Base score: 5.8
Base severity: MEDIUM
Vector:
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
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
https://github.com/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2f
x_refsource_CONFIRM
https://github.com/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af47
x_refsource_MISC
https://github.com/getkirby/kirby/releases/tag/5.2.2
x_refsource_MISC
Hyperlink: https://github.com/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2f
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af47
Resource:
x_refsource_MISC
Hyperlink: https://github.com/getkirby/kirby/releases/tag/5.2.2
Resource:
x_refsource_MISC
â–¼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions

Configurations

Workarounds

Exploits

Credits

Timeline
EventDate
Replaced By

Rejected Reason

References
HyperlinkResource
Information is not available yet
â–¼National Vulnerability Database (NVD)
nvd.nist.gov
Source:security-advisories@github.com
Published At:08 Jan, 2026 | 18:15
Updated At:02 Feb, 2026 | 19:02

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 issue has been patched in version 5.2.2.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.05.8MEDIUM
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Primary3.15.7MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
Type: Secondary
Version: 4.0
Base score: 5.8
Base severity: MEDIUM
Vector:
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Type: Primary
Version: 3.1
Base score: 5.7
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:H/A:N
CPE Matches

getkirby
getkirby
>>kirby>>Versions from 5.0.0(inclusive) to 5.2.2(exclusive)
cpe:2.3:a:getkirby:kirby:*:*:*:*:*:*:*:*
Weaknesses
CWE IDTypeSource
CWE-863Primarysecurity-advisories@github.com
CWE ID: CWE-863
Type: Primary
Source: security-advisories@github.com
Evaluator Description

Evaluator Impact

Evaluator Solution

Vendor Statements

References
HyperlinkSourceResource
https://github.com/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af47security-advisories@github.com
Patch
https://github.com/getkirby/kirby/releases/tag/5.2.2security-advisories@github.com
Product
Release Notes
https://github.com/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2fsecurity-advisories@github.com
Patch
Vendor Advisory
Hyperlink: https://github.com/getkirby/kirby/commit/f5ce1347b427b819bf193acf11fd0da232f7af47
Source: security-advisories@github.com
Resource:
Patch
Hyperlink: https://github.com/getkirby/kirby/releases/tag/5.2.2
Source: security-advisories@github.com
Resource:
Product
Release Notes
Hyperlink: https://github.com/getkirby/kirby/security/advisories/GHSA-4j78-4xrm-cr2f
Source: security-advisories@github.com
Resource:
Patch
Vendor Advisory

Change History

0
Information is not available yet

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