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CVE-2025-46341

Estado: AnalizadaAlta (7.1)—

FreshRSS is a self-hosted RSS feed aggregator. Prior to version 1.26.2, when the server is using HTTP auth via reverse proxy, it's possible to impersonate any user either via the `Remote-User` header or the `X-WebAuth-User` header by making specially crafted requests via the add feed functionality and obtaining the CSRF token via XPath scraping. The attacker has to know the IP address of the proxied FreshRSS instance and the admin's username, while also having an account on the instance. An attacker can send specially crafted requests in order to gain unauthorized access to internal services.

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This can also lead to privilege escalation like in the demonstrated scenario, although users that have setup OIDC are not affected by privilege escalation. Version 1.26.2 contains a patch for the issue.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

FreshRSS requiere autenticación (PR:L) y red local/adyacente para explotar headers de proxy HTTP. El atacante impersona usuarios y escalada de privilegios a admin manipulando headers remotos en servicios internos (CWE-918: SSRF).

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramApplication Isolation and SandboxingExploit ProtectionUpdate SoftwareVulnerability ScanningPrivileged Account Management

Tecnologías afectadas (1)

Freshrss — Freshrss

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2025-46341",
  "cveTags": [],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-46341",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-06-04T20:49:25.381466Z"
        }
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          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 7.1,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
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        "exploitabilityScore": 1.8
      }
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      "source": "security-advisories@github.com",
      "affectedData": [
        {
          "vendor": "FreshRSS",
          "product": "FreshRSS",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.26.2"
            }
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  "published": "2025-06-04T21:15:39.937",
  "references": [
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      "url": "https://github.com/FreshRSS/FreshRSS/commit/6bb8680ae0051b9a2ff344f17814f4fa5d844628",
      "tags": [
        "Patch"
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      "url": "https://github.com/FreshRSS/FreshRSS/security/advisories/GHSA-w3m8-wcf4-h8vm",
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      "description": [
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "FreshRSS is a self-hosted RSS feed aggregator. Prior to version 1.26.2, when the server is using HTTP auth via reverse proxy, it's possible to impersonate any user either via the `Remote-User` header or the `X-WebAuth-User` header by making specially crafted requests via the add feed functionality and obtaining the CSRF token via XPath scraping. The attacker has to know the IP address of the proxied FreshRSS instance and the admin's username, while also having an account on the instance. An attacker can send specially crafted requests in order to gain unauthorized access to internal services. This can also lead to privilege escalation like in the demonstrated scenario, although users that have setup OIDC are not affected by privilege escalation. Version 1.26.2 contains a patch for the issue."
    },
    {
      "lang": "es",
      "value": "FreshRSS es un agregador de feeds RSS autoalojado. Antes de la versión 1.26.2, cuando el servidor utiliza autenticación HTTP mediante proxy inverso, era posible suplantar la identidad de cualquier usuario mediante el encabezado `Remote-User` o `X-WebAuth-User`, realizando solicitudes personalizadas mediante la función para agregar feeds y obteniendo el token CSRF mediante el raspado de XPath. El atacante debe conocer la dirección IP de la instancia de FreshRSS con proxy y el nombre de usuario del administrador, además de tener una cuenta en la instancia. Un atacante puede enviar solicitudes personalizadas para obtener acceso no autorizado a servicios internos. Esto también puede provocar una escalada de privilegios, como en el caso mostrado, aunque los usuarios con OIDC configurado no se ven afectados. La versión 1.26.2 incluye un parche para este problema."
    }
  ],
  "lastModified": "2026-06-17T09:26:16.053",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "vulnerable": true,
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              "versionEndExcluding": "1.26.2"
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