---
cve: "CVE-2026-75594"
severity: "HIGH"
cvss: 8.2
epss: "0.5%"
vendor: "getkirby"
kev: false
exploited: false
published: "2026-08-31 21:17:48"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-22T03:07:32+02:00"
---

# CVE-2026-75594

> 8.2 HIGH · 🧪 PoC

## Beschreibung

Kirby is an open-source content management system. Prior to 4.9.5 and 5.5.2, depending on the release line, Kirby's media handler in src/Cms/Media.php allowed Kirby\Cms\Media::thumb() to append a path-bearing filename to a validated parent media directory. On nginx, PHP's built-in server, or Apache with AllowEncodedSlashes enabled, a remote attacker could submit encoded slash characters such as %2f in the filename and traverse outside the parent's media directory. Differences between responses for existing and nonexistent thumbnail configurations disclosed whether an arbitrary .json file existed, and a .json file containing a valid filename key could cause the referenced image to be returned and the job file to be deleted. The related file::version path in src/Filesystem/Asset.php also accepted ../ sequences outside the intended index root. This issue is fixed in versions 4.9.5 and 5.5.2.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |

## Patch verfügbar (OSV)

- 22fbaedb7e6dd61f5def10829ba7bd7e73e0dcc9 (Commit)
- a40808f5c2ee5d42bb597fb6ffbe0de0ce8e4d20 (Commit)

## Referenzen

- <https://github.com/getkirby/kirby/security/advisories/GHSA-9vx2-j98c-p72w>
- <https://github.com/getkirby/kirby/commit/22fbaedb7e6dd61f5def10829ba7bd7e73e0dcc9>
- <https://github.com/getkirby/kirby/commit/a40808f5c2ee5d42bb597fb6ffbe0de0ce8e4d20>
- <https://github.com/getkirby/kirby/commit/cd7abb68d298f3443eafd43fa2d0c7ad0f933d0e>
- <https://github.com/getkirby/kirby/commit/e0dca5f709adc21b36f5549df2c0619bc59da56c>
- <https://github.com/getkirby/kirby/releases/tag/4.9.5>
- <https://github.com/getkirby/kirby/releases/tag/5.5.2>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-75594) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_