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CVE-2020-1055

Status: ModifiedMedium (6.1)—

A cross-site-scripting (XSS) vulnerability exists when Active Directory Federation Services (ADFS) does not properly sanitize user inputs. An un-authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected ADFS server. The attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run scripts in the security context of the current user. This security update addresses the vulnerability by ensuring that ADFS properly sanitizes user inputs.

CVSS

Exploitation probability (EPSS)

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).

Affected technologies (3)

Microsoft — Windows 10Microsoft — Windows Server 2016Microsoft — Windows Server 2019

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2020-1055",
  "cveTags": [],
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        "obtainAllPrivilege": false,
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  "published": "2020-05-21T23:15:12.133",
  "references": [
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      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1055",
      "source": "secure@microsoft.com"
    },
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      "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1055",
      "tags": [
        "Patch",
        "Vendor Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
      "description": [
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          "value": "CWE-79"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "A cross-site-scripting (XSS) vulnerability exists when Active Directory Federation Services (ADFS) does not properly sanitize user inputs. An un-authenticated attacker could exploit the vulnerability by sending a specially crafted request to an affected ADFS server.\nThe attacker who successfully exploited the vulnerability could then perform cross-site scripting attacks on affected systems and run scripts in the security context of the current user.\nThis security update addresses the vulnerability by ensuring that ADFS properly sanitizes user inputs."
    },
    {
      "lang": "es",
      "value": "Existe una vulnerabilidad de tipo cross-site-scripting (XSS) cuando Active Directory Federation Services (ADFS) no sanean apropiadamente las entradas de los usuarios, también se conoce como \"Microsoft Active Directory Federation Services Cross-Site Scripting Vulnerability\"."
    }
  ],
  "lastModified": "2026-08-19T17:17:10.260",
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}