---
cve: "CVE-2026-52771"
severity: "HIGH"
cvss: 8.3
epss: "0.5%"
vendor: "YesWiki"
kev: false
exploited: false
published: "2026-09-04 23:41:34"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-10-29T15:32:17+01:00"
---

# CVE-2026-52771

> 8.3 HIGH · 🧪 PoC

## Beschreibung

YesWiki is a wiki system written in PHP. From version 4.2.0 to before version 4.6.6, ApiController::deletePage() interpolates a page tag retrieved from the database into a DELETE FROM …_links WHERE to_tag = '$tag' query without escaping. The page tag is attacker-controlled — the POST /api/pages/{tag} API accepts arbitrary URL-encoded values, including single quotes, and stores them. A low-privilege authenticated user can therefore create a page whose tag is a SQL fragment, make the page non-orphaned via the standard {{include page="…"}} link mechanism, and then invoke the delete endpoint to execute arbitrary SQL inside the wiki database - including time-based blind data exfiltration from any table. This issue has been patched in version 4.6.6.

## CNA-Record (Kanon, cvelistV5)

- CNA: **GitHub_M**
- State: PUBLISHED
- Stand: 2026-09-08 16:56:23
- CNA-CVSS: **8.3** (`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L`)

## CISA-Anreicherung (vulnrichment/ADP)

- CISA-SSVC (Coordinator, v2.0.3):
  - Exploitation: **none**
  - Automatable: **no**
  - Technical Impact: **total**

## CVSS-Vektor

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

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Hoch | bad |
| I Integrität | Hoch | bad |
| A Verfügbarkeit | Gering | warn |

## Schwachstellen-Klasse

- **CWE-89** — Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')
  The product constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component. Without sufficient removal or quoting of SQL syntax in user-controllable inputs, the generated SQL query can cause those inputs to be interpreted as…

## Angriffsmuster (CAPEC)

- [CAPEC-7 — Blind SQL Injection](https://capec.mitre.org/data/definitions/7.html) _(Severity: High)_
- [CAPEC-66 — SQL Injection](https://capec.mitre.org/data/definitions/66.html) _(Severity: High)_
- [CAPEC-108 — Command Line Execution through SQL Injection](https://capec.mitre.org/data/definitions/108.html) _(Severity: Very High)_
- [CAPEC-109 — Object Relational Mapping Injection](https://capec.mitre.org/data/definitions/109.html) _(Severity: High)_
- [CAPEC-110 — SQL Injection through SOAP Parameter Tampering](https://capec.mitre.org/data/definitions/110.html) _(Severity: Very High)_
- [CAPEC-470 — Expanding Control over the Operating System from the Database](https://capec.mitre.org/data/definitions/470.html) _(Severity: Very High)_

## Patch verfügbar (OSV)

- fa81922f4103630911cbea98ead3c4b7bc786e19 (Commit)
- 23d3cc124613b9428ab963b31807c08879a9c631 (Commit)

## Referenzen

- <https://github.com/YesWiki/yeswiki/security/advisories/GHSA-8f2v-2qhj-gfwg>
- <https://github.com/YesWiki/yeswiki/commit/23d3cc124613b9428ab963b31807c08879a9c631>
- <https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/sicherheitsluecken/cve-2026-52771/) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI WID (CSAF)_