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CVE-2021-25981

Estado: ModificadaCrítica (9.8)—

In Talkyard, regular versions v0.2021.20 through v0.2021.33 and dev versions v0.2021.20 through v0.2021.34, are vulnerable to Insufficient Session Expiration. This may allow an attacker to reuse the admin’s still-valid session token even when logged-out, to gain admin privileges, given the attacker is able to obtain that token (via other, hypothetical attacks)

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).

Tecnologías afectadas (1)

Talkyard — Talkyard

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2021-25981",
  "cveTags": [],
  "metrics": {
    "cvssMetricV2": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "version": "2.0",
          "baseScore": 10,
          "accessVector": "NETWORK",
          "vectorString": "AV:N/AC:L/Au:N/C:C/I:C/A:C",
          "authentication": "NONE",
          "integrityImpact": "COMPLETE",
          "accessComplexity": "LOW",
          "availabilityImpact": "COMPLETE",
          "confidentialityImpact": "COMPLETE"
        },
        "acInsufInfo": false,
        "impactScore": 10,
        "baseSeverity": "HIGH",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 10,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "vulnerabilitylab@mend.io",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      },
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 9.8,
          "attackVector": "NETWORK",
          "baseSeverity": "CRITICAL",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "affected": [
    {
      "source": "vulnerabilitylab@mend.io",
      "affectedData": [
        {
          "vendor": "debiki",
          "product": "talkyard",
          "versions": [
            {
              "status": "affected",
              "version": "v0.2021.20",
              "lessThan": "unspecified",
              "versionType": "custom"
            },
            {
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom",
              "lessThanOrEqual": "v0.2021.34"
            }
          ]
        }
      ]
    }
  ],
  "published": "2022-01-03T07:15:06.943",
  "references": [
    {
      "url": "https://github.com/debiki/talkyard/commit/b0310df019887f3464895529c773bc7d85ddcf34",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "vulnerabilitylab@mend.io"
    },
    {
      "url": "https://github.com/debiki/talkyard/commit/b0712915d8a22a20b09a129924e8a29c25ae5761",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "vulnerabilitylab@mend.io"
    },
    {
      "url": "https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25981",
      "tags": [
        "Patch",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "vulnerabilitylab@mend.io"
    },
    {
      "url": "https://github.com/debiki/talkyard/commit/b0310df019887f3464895529c773bc7d85ddcf34",
      "tags": [
        "Patch",
        "Third Party Advisory"
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      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://github.com/debiki/talkyard/commit/b0712915d8a22a20b09a129924e8a29c25ae5761",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    },
    {
      "url": "https://www.whitesourcesoftware.com/vulnerability-database/CVE-2021-25981",
      "tags": [
        "Patch",
        "Third Party Advisory",
        "VDB Entry"
      ],
      "source": "af854a3a-2127-422b-91ae-364da2661108"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Secondary",
      "source": "vulnerabilitylab@mend.io",
      "description": [
        {
          "lang": "en",
          "value": "CWE-613"
        }
      ]
    },
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-613"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In Talkyard, regular versions v0.2021.20 through v0.2021.33 and dev versions v0.2021.20 through v0.2021.34, are vulnerable to Insufficient Session Expiration. This may allow an attacker to reuse the admin’s still-valid session token even when logged-out, to gain admin privileges, given the attacker is able to obtain that token (via other, hypothetical attacks)"
    },
    {
      "lang": "es",
      "value": "En Talkyard, versiones regulares v0.2021.20 hasta v0.2021.33 y versiones dev v0.2021.20 hasta v0.2021.34, son vulnerables a una Expiración de Sesión Insuficiente. Esto puede permitir a un atacante reusar el token de sesión aún válido del administrador, incluso cuando ha cerrado la sesión, para alcanzar privilegios de administrador, dado que el atacante es capaz de obtener ese token (por medio de otros ataques hipotéticos)"
    }
  ],
  "lastModified": "2026-06-17T03:42:43.460",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:talkyard:talkyard:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D8DD8DF0-01D7-4BF4-845A-91A486F67A39",
              "versionEndExcluding": "0.2021.35",
              "versionStartIncluding": "0.2021.20"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "vulnerabilitylab@mend.io"
}