CVE-2026-44429

Что произошло

The MCP Registry provides MCP clients with a list of MCP servers, like an app store for MCP servers. Prior to 1.7.7, the public catalogue UI served at GET / (file internal/api/handlers/v0/ui_index.html) is vulnerable to stored cross-site scripting via the server.websiteUrl field of any published server.json. Server-side validation in internal/validators/validators.go (validateWebsiteURL) only checks that the URL parses, is absolute, and uses the https scheme; it does not reject quote characters. Client-side, the value is interpolated into a double-quoted href attribute via innerHTML, using a homegrown escapeHtml helper that performs the standard textContent → innerHTML round-trip. Per the HTML serialisation algorithm, that round-trip encodes only &, and U+00A0 inside text nodes — it does not encode " or '. A literal " in websiteUrl therefore breaks out of the href attribute, allowing arbitrary on* event handlers to be appended to the same element. The Content-Security-Policy on / is script-src 'self' 'unsafe-inline' https://cdn.tailwindcss.com, so the injected event handlers execute. Any user able to obtain a publish token (e.g. via POST /v0/auth/github-at with their own GitHub account, or POST /v0/auth/none on a deployment that has anonymous auth enabled) can plant a poisoned record visible to every visitor of the registry homepage. This vulnerability is fixed in 1.7.7.

Что делать

dpkg-query -W -f='${Package}	${Version}\n'

rpm -qa --qf '%{NAME}\t%{VERSION}-%{RELEASE}\n'

Get-HotFix | Select-Object HotFixID, InstalledOn

Продукты и затронутые версии

{
  "status": "affected",
  "version": "< 1.7.7"
}

{
  "status": "affected",
  "version": "*",
  "versionEndExcluding": "1.7.7"
}

cpe:2.3:a:lfprojects:mcp_registry:*:*:*:*:*:*:*:*

CVSS: оценки и векторы

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

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:N/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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

Источники и ссылки

{
  "cwes": [
    "cve",
    "nvd"
  ],
  "epss": {
    "source": "epss",
    "received_at": "2026-11-04T21:17:21.931623+00:00"
  },
  "title": {
    "source": "cve",
    "received_at": "2026-10-28T19:31:46.453319+00:00"
  },
  "scores": [
    "cve",
    "nvd"
  ],
  "status": {
    "source": "cve",
    "received_at": "2026-10-28T19:31:46.453319+00:00"
  },
  "affected": [
    "cve",
    "nvd"
  ],
  "published": {
    "source": "cve",
    "received_at": "2026-10-28T19:31:46.453319+00:00"
  },
  "solutions": [],
  "percentile": {
    "source": "epss",
    "received_at": "2026-11-04T21:17:21.931623+00:00"
  },
  "references": [
    "cve",
    "nvd"
  ],
  "description": {
    "source": "cve",
    "received_at": "2026-10-28T19:31:46.453319+00:00"
  },
  "workarounds": [],
  "configurations": [
    "nvd"
  ]
}

Хронология записи

1. Данные обновлены05.11.2026, 00:17
2. Данные обновлены04.11.2026, 00:13
3. Данные обновлены03.11.2026, 00:12
4. Данные обновлены02.11.2026, 00:11
5. Данные обновлены31.10.2026, 11:58
6. Данные обновлены28.10.2026, 22:31
7. Данные обновлены28.10.2026, 18:06
8. Появилась ссылка на PoC28.10.2026, 15:14

Личная заметка и статус

Другие CVE того же продукта