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Vulnerability details: VCID-xjxr-1fjw-63ca
Vulnerability ID VCID-xjxr-1fjw-63ca
Aliases CVE-2026-42174
GHSA-39cp-6679-8xv2
Summary Kirby is an open-source content management system. Prior to versions 4.9.0 and 5.4.0, user avatar creation, replacement and deletion are not gated by user update permissions. This issue has been patched in versions 4.9.0 and 5.4.0.
Status Published
Exploitability 0.5
Weighted Severity 6.2
Risk 3.1
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-862 Missing Authorization
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-42174
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-42174
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-42174
epss 9e-05 https://api.first.org/data/v1/epss?cve=CVE-2026-42174
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-39cp-6679-8xv2
cvssv4 5.3 https://github.com/getkirby/kirby
generic_textual MODERATE https://github.com/getkirby/kirby
cvssv4 5.3 https://github.com/getkirby/kirby/releases/tag/4.9.0
generic_textual MODERATE https://github.com/getkirby/kirby/releases/tag/4.9.0
ssvc Track https://github.com/getkirby/kirby/releases/tag/4.9.0
cvssv4 5.3 https://github.com/getkirby/kirby/releases/tag/5.4.0
generic_textual MODERATE https://github.com/getkirby/kirby/releases/tag/5.4.0
ssvc Track https://github.com/getkirby/kirby/releases/tag/5.4.0
cvssv3.1_qr MODERATE https://github.com/getkirby/kirby/security/advisories/GHSA-39cp-6679-8xv2
cvssv4 5.3 https://github.com/getkirby/kirby/security/advisories/GHSA-39cp-6679-8xv2
generic_textual MODERATE https://github.com/getkirby/kirby/security/advisories/GHSA-39cp-6679-8xv2
ssvc Track https://github.com/getkirby/kirby/security/advisories/GHSA-39cp-6679-8xv2
cvssv4 5.3 https://nvd.nist.gov/vuln/detail/CVE-2026-42174
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2026-42174
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2026-42174
https://github.com/getkirby/kirby
https://nvd.nist.gov/vuln/detail/CVE-2026-42174
4.9.0 https://github.com/getkirby/kirby/releases/tag/4.9.0
5.4.0 https://github.com/getkirby/kirby/releases/tag/5.4.0
GHSA-39cp-6679-8xv2 https://github.com/advisories/GHSA-39cp-6679-8xv2
GHSA-39cp-6679-8xv2 https://github.com/getkirby/kirby/security/advisories/GHSA-39cp-6679-8xv2
No exploits are available.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/getkirby/kirby
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

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Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/getkirby/kirby/releases/tag/4.9.0
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:41:35Z/ Found at https://github.com/getkirby/kirby/releases/tag/4.9.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/getkirby/kirby/releases/tag/5.4.0
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:41:35Z/ Found at https://github.com/getkirby/kirby/releases/tag/5.4.0
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://github.com/getkirby/kirby/security/advisories/GHSA-39cp-6679-8xv2
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

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Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-11T17:41:35Z/ Found at https://github.com/getkirby/kirby/security/advisories/GHSA-39cp-6679-8xv2
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N Found at https://nvd.nist.gov/vuln/detail/CVE-2026-42174
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

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none

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low

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Exploit Prediction Scoring System (EPSS)
Percentile 0.01032
EPSS Score 9e-05
Published At June 11, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-06-11T16:44:25.314704+00:00 Vulnrichment Import https://github.com/cisagov/vulnrichment/blob/develop/2026/42xxx/CVE-2026-42174.json 38.6.0