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CVE-2020-26255

27
FAUCET Score

CVE-2020-26255 is a critical vulnerability affecting Kirby CMS (versions prior to 3.4.5) and Kirby Panel (versions prior to 2.5.14). It allows an authenticated Panel editor with full access to upload and execute a malicious PHP .phar file, leading to server compromise. This vulnerability has a CVSS score of 9.1 (Critical) due to its high impact on confidentiality, integrity, and availability, with low attack complexity and no user interaction required. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.4.5CPE matchmatch criteria
cpe:2.3:a:getkirby:kirby:*:*:*:*:*:*:*:*
< 2.5.14CPE matchmatch criteria
cpe:2.3:a:getkirby:panel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.8MEDIUM

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
HIGH
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
NONE
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.47%
Probability of exploitation in next 30 days
EPSS Percentile
71.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0147 is in the 68th percentile among its peer group of 462 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.7 Bluesky, 0.4 Mastodon, and 1.7 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.4 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

composerpatch availablevia ghsa
Product: getkirby/panelFixed in: 2.5.14
composerpatch availablevia ghsa
Product: getkirby/cmsFixed in: 3.4.5
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-g3h8-cg9x-47qwmedium

Kirby Panel users could upload PHP Phar archives as content files before v2.5.14 and v3.4.5

Dec 8, 2020

References

github.com / getkirby/kirby/commit/db8f371b13036861c9cc5ba3e85e27f73fce5e09
PatchThird Party Advisory
github.com / getkirby/kirby/releases/tag/3.4.5
Release NotesThird Party Advisory
github.com / getkirby/kirby/security/advisories/GHSA-g3h8-cg9x-47qw
Release NotesThird Party Advisory
github.com / getkirby-v2/panel/commit/5a569d4e3ddaea2b6628d7ec1472a3e8bc410881
PatchThird Party Advisory
packagist.org / packages/getkirby/cms
ProductThird Party Advisory
packagist.org / packages/getkirby/panel
ProductThird Party Advisory