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CVE-2020-5283

Status: ModifiedLow (3.5)—

ViewVC before versions 1.1.28 and 1.2.1 has a XSS vulnerability in CVS show_subdir_lastmod support. The impact of this vulnerability is mitigated by the need for an attacker to have commit privileges to a CVS repository exposed by an otherwise trusted ViewVC instance that also has the `show_subdir_lastmod` feature enabled. The attack vector involves files with unsafe names (names that, when embedded into an HTML stream, would cause the browser to run unwanted code), which themselves can be challenging to create. This vulnerability is patched in versions 1.2.1 and 1.1.28.

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).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Source: official MITRE CTID mapping (CVE → ATT&CK).

🛡️ ATT&CK mitigations that cover these techniques

User TrainingUser Account ManagementRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationExecution Prevention

Affected technologies (1)

Viewvc — Viewvc

CWEs

References

Raw JSON (NVD)

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{
  "id": "CVE-2020-5283",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 2.1,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:H/Au:S/C:N/I:P/A:N",
          "authentication": "SINGLE",
          "integrityImpact": "PARTIAL",
          "accessComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
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    "cvssMetricV31": [
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        "type": "Secondary",
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        "cvssData": {
          "scope": "UNCHANGED",
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          "baseScore": 3.1,
          "attackVector": "NETWORK",
          "baseSeverity": "LOW",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "HIGH",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 0.5
      },
      {
        "type": "Primary",
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        "cvssData": {
          "scope": "UNCHANGED",
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          "baseScore": 3.5,
          "attackVector": "NETWORK",
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          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "REQUIRED",
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          "availabilityImpact": "NONE",
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          "confidentialityImpact": "LOW"
        },
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        "exploitabilityScore": 0.9
      }
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  },
  "affected": [
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      "affectedData": [
        {
          "vendor": "viewvc",
          "product": "viewvc",
          "versions": [
            {
              "status": "affected",
              "version": "< 1.1.28"
            },
            {
              "status": "affected",
              "version": ">= 1.2.0, < 1.2.1"
            }
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        }
      ]
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  ],
  "published": "2020-04-03T00:15:11.943",
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      "tags": [
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    },
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      "tags": [
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
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      "source": "security-advisories@github.com",
      "description": [
        {
          "lang": "en",
          "value": "CWE-80"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "ViewVC before versions 1.1.28 and 1.2.1 has a XSS vulnerability in CVS show_subdir_lastmod support. The impact of this vulnerability is mitigated by the need for an attacker to have commit privileges to a CVS repository exposed by an otherwise trusted ViewVC instance that also has the `show_subdir_lastmod` feature enabled. The attack vector involves files with unsafe names (names that, when embedded into an HTML stream, would cause the browser to run unwanted code), which themselves can be challenging to create. This vulnerability is patched in versions 1.2.1 and 1.1.28."
    },
    {
      "lang": "es",
      "value": "ViewVC versiones anteriores a 1.1.28 y 1.2.1, presenta una vulnerabilidad de tipo XSS en el soporte show_subdir_lastmod de CVS. El impacto de esta vulnerabilidad está mitigado mediante la necesidad de que un atacante tenga privilegios de commit en un repositorio CVS expuesto por una instancia de ViewVC confiable que también tenga la funcionalidad \"show_subdir_lastmod\" habilitada. El vector de ataque involucra archivos con nombres no seguros (nombres que, cuando se insertan en una secuencia de datos HTML, causarían que el navegador ejecute un código no deseado), que pueden ser en si mismos difíciles de crear. Esta vulnerabilidad está parcheada en las versiones 1.2.1 y 1.1.28."
    }
  ],
  "lastModified": "2026-06-17T03:21:11.940",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
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              "versionEndExcluding": "1.1.28"
            },
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            }
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          "operator": "OR"
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  "sourceIdentifier": "security-advisories@github.com"
}