CVE-2026-52771

Status: DeferredHigh (8.3)—

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.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
Base score: 8.3

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.51%
Percentile among all scored CVEs: 42
Score date: 10/6/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1210 Exploitation of Remote Serviceslateral movement85 %
Primary impactT1005 Data from Local Systemcollection90 %
Secondary impactT1059 Command and Scripting Interpreterexecution70 %
Secondary impactT1565.001 Stored Data Manipulationimpact85 %

SQL injection (CWE-89) en API remota que requiere autenticación (PR:L) permite exfiltración de datos y manipulación de la BD; inyección de fragmentos SQL sin escape en consulta DELETE.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Privileged Account Management Disable or Remove Feature or Program Vulnerability Scanning Threat Intelligence Program Restrict Web-Based Content Restrict File and Directory Permissions

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Yeswiki — Yeswiki^AI

CWEs

CWE-89

References

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-52771",
  "cveTags": [],
  "metrics": {
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          "id": "CVE-2026-52771",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-09-08T16:41:16.858942Z"
        }
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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  "affected": [
    {
      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "YesWiki",
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          "versions": [
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              "version": ">= 4.2.0, < 4.6.6"
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  "published": "2026-09-05T00:17:19.963",
  "references": [
    {
      "url": "https://github.com/YesWiki/yeswiki/commit/23d3cc124613b9428ab963b31807c08879a9c631",
      "source": "security-advisories@github.com"
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    {
      "url": "https://github.com/YesWiki/yeswiki/releases/tag/v4.6.6",
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      "url": "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-8f2v-2qhj-gfwg",
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      "lang": "en",
      "value": "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."
    }
  ],
  "lastModified": "2026-09-08T21:05:26.920",
  "sourceIdentifier": "security-advisories@github.com"
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