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CVE-2020-16270

Status: ModifiedMedium (6.1)—PoC
Severity6.1Medium · CVSS 3.1
Exploitation probability13 %higher than 96% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitAvailableProof of concept on GitHub (unverified)

OLIMPOKS under 3.3.39 allows Auth/Admin ErrorMessage XSS. Remote Attacker can use discovered vulnerability to inject malicious JavaScript payload to victim’s browsers in context of vulnerable applications. Executed code can be used to steal administrator’s cookies, influence HTML content of targeted application and perform phishing-related attacks. Vulnerable application used in more than 3000 organizations in different sectors from retail to industries.

CVSS

Base score
6.1
Version
3.1
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
13 %
Percentile among all scored CVEs
96
Score date
10/28/2026

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).

Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Olimpoks — Olimpok

CWEs

References

Show 6 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2020-16270",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 4.3,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:M/Au:N/C:N/I:P/A:N",
          "authentication": "NONE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "MEDIUM",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "MEDIUM",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 8.6,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "CHANGED",
          "version": "3.1",
          "baseScore": 6.1,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.7,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "cve@mitre.org",
      "affectedData": [
        {
          "vendor": "n/a",
          "product": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ]
    }
  ],
  "published": "2020-10-16T14:15:11.720",
  "references": [
    {
      "url": "https://bdu.fstec.ru/vul/2020-04623",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://github.com/Security-AVS/CVE-2020-16270",
      "tags": [
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      "source": "cve@mitre.org"
    },
    {
      "url": "https://olimpoks.ru/oks/forum/olimpoks5.php",
      "tags": [
        "Product",
        "Vendor Advisory"
      ],
      "source": "cve@mitre.org"
    },
    {
      "url": "https://bdu.fstec.ru/vul/2020-04623",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/Security-AVS/CVE-2020-16270",
      "tags": [
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://olimpoks.ru/oks/forum/olimpoks5.php",
      "tags": [
        "Product",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "OLIMPOKS under 3.3.39 allows Auth/Admin ErrorMessage XSS. Remote Attacker can use discovered vulnerability to inject malicious JavaScript payload to victim’s browsers in context of vulnerable applications. Executed code can be used to steal administrator’s cookies, influence HTML content of targeted application and perform phishing-related attacks. Vulnerable application used in more than 3000 organizations in different sectors from retail to industries."
    },
    {
      "lang": "es",
      "value": "OLIMPOKS en 3.3.39 permite Auth/Admin ErrorMessage XSS. El Atacante Remoto puede usar la vulnerabilidad descubierta para inyectar carga útil JavaScript maliciosa a los navegadores de las víctimas en el contexto de aplicaciones vulnerables. El código ejecutado puede utilizarse para robar las cookies del administrador, influir en el contenido HTML de la aplicación objetivo y realizar ataques relacionados con la suplantación de identidad (phishing). Aplicación vulnerable utilizada en más de 3000 organizaciones de diferentes sectores, desde el comercio minorista hasta las industrias"
    }
  ],
  "lastModified": "2026-06-17T02:57:58.443",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:olimpoks:olimpok:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "9083ABB4-800D-459B-BB6F-32CB55756A21",
              "versionEndExcluding": "3.3.39"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "cve@mitre.org"
}