CVE-2024-56529

Status: DeferredHigh (7.1)—

Mailcow through 2024-11b has a session fixation vulnerability in the web panel. It allows remote attackers to set a session identifier when HSTS is disabled on a victim's browser. After a user logs in, they are authenticated and the session identifier is valid. Then, a remote attacker can access the victim's web panel with the same session identifier.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N
Base score: 7.1

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.42%
Percentile among all scored CVEs: 34
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.

ExploitationT1203 Exploitation for Client Executionexecution75 %
Primary impactT1078.001 Default Accountsstealth · persistence · privilege escalation · initial access80 %
Secondary impactT1005 Data from Local Systemcollection60 %

UI:R (requiere interacción del usuario al hacer login) y vector N/AV:N dictan T1203. La fijación de sesión permite acceso a cuenta válida (T1078.001) y lectura de datos del panel (C:L en CVSS).

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

Password Policies Multi-factor Authentication Application Isolation and Sandboxing Exploit Protection Update Software Data Loss Prevention

Affected technologies (1)

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

Mailcow — Mailcow^AI

CWEs

CWE-384

References

https://github.com/mailcow/mailcow-dockerized/security/advisories/GHSA-23c8-4wwr-g3c6

Raw JSON (NVD)

Show

{
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  "cveTags": [],
  "metrics": {
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          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2025-01-29T14:27:14.024324Z"
        }
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          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
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        "impactScore": 4.2,
        "exploitabilityScore": 2.8
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  "affected": [
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      "affectedData": [
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  "published": "2025-01-28T23:15:07.947",
  "references": [
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      "value": "Mailcow through 2024-11b has a session fixation vulnerability in the web panel. It allows remote attackers to set a session identifier when HSTS is disabled on a victim's browser. After a user logs in, they are authenticated and the session identifier is valid. Then, a remote attacker can access the victim's web panel with the same session identifier."
    },
    {
      "lang": "es",
      "value": "Mailcow hasta 2024-11b tiene una vulnerabilidad de fijación de sesión en el panel web. Permite a atacantes remotos establecer un identificador de sesión cuando HSTS está deshabilitado en el navegador de la víctima. Después de que un usuario inicia sesión, se autentica y el identificador de sesión es válido. Luego, un atacante remoto puede acceder al panel web de la víctima con el mismo identificador de sesión."
    }
  ],
  "lastModified": "2026-06-17T08:12:18.900",
  "sourceIdentifier": "cve@mitre.org"
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