CVE-2020-26255

mediumpriority · track · 37EPSS 0.015 · 74 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.49% (74th) EPSS

CVSS 6.5 · medium

Is it mine?

5 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

Kirby is a CMS. In Kirby CMS (getkirby/cms) before version 3.4.5, and Kirby Panel before version 2.5.14 , an editor with full access to the Kirby Panel can upload a PHP .phar file and execute it on the server. This vulnerability is critical if you might have potential attackers in your group of authenticated Panel users, as they can gain access to the server with such a Phar file. Visitors without Panel access *cannot* use this attack vector. The problem has been patched in Kirby 2.5.14 and Kirby 3.4.5. Please update to one of these or a later version to fix the vulnerability. Note: Kirby 2 reaches end of life on December 31, 2020. We therefore recommend to upgrade your Kirby 2 sites to Kirby 3. If you cannot upgrade, we still recommend to update to Kirby 2.5.14.

cvss

Technical severity, 0–10. One row per scoring source.

9.1

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–critical · 6.5–9.1

v2.06.5mediumAV:N/AC:L/Au:S/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 8 · impact 6.4

v3.19.1criticalCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 2.3 · impact 6

v3.16.8mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:Nsecondary · ENISA EU

v3.16.8mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:Nsecondary · security-advisories@github.comexploitability 2.3 · impact 4

v3.16.8mediumCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:Nsecondary · OSV

v3.18.3highCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-434USprimaryCWE-434US

affected products (5)

Products and version ranges known to be affected.

getkirby kirby≤ < 3.4.5enisa_euvdEU
getkirby kirby< 3.4.5nvdUScpe:2.3:a:getkirby:kirby:*:*:*:*:*:*:*:*
getkirby panel< 2.5.14nvdUScpe:2.3:a:getkirby:panel:*:*:*:*:*:*:*:*
Packagist getkirby/cms3.0.0 → 3.4.5osvUSpkg:composer/getkirby/cms
Packagist getkirby/panel< 2.5.14osvUSpkg:composer/getkirby/panel

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-g3h8-cg9x-47qwKirby Panel users could upload PHP Phar archives as content files before v2.5.14 and v3.4.52020-12-08ghsa · osvUS
### Impact An editor with full access to the Kirby Panel can upload a PHP `.phar` file and execute it on the server. This vulnerability is critical if you might have potential attackers in your group of authenticated Panel users, as they can gain access to the server with such a Phar file. Visitors without Panel access *cannot* use this attack vector. ### Patches The problem has been patched in [Kirby 2.5.14](https://github.com/getkirby-v2/panel/releases/tag/2.5.14) and [Kirby 3.4.5](https://github.com/getkirby/kirby/releases/tag/3.4.5). Please update to one of these or a [later version](https://github.com/getkirby/kirby/releases/) to fix the vulnerability. **Note:** Kirby 2 reaches end of life on December 31, 2020. We therefore recommend to upgrade your Kirby 2 sites to Kirby 3. If you cannot upgrade, we still recommend to update to Kirby 2.5.14. ### Workarounds Kirby 2 sites on older releases can also be patched by applying the [changes from this commit](https://github.com/getkirby-v2/panel/commit/5a569d4e3ddaea2b6628d7ec1472a3e8bc410881). ### Credits Thanks to Thore Imhof of Accenture for reporting the problem.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2020-12-08modified 2026-06-17

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references (19)

External citations — patches, advisories, analysis.

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