{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2021-25980",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-25980",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2021-11-11T07:10:11.000Z",
    "updatedAt": "2025-04-30T15:46:56.474Z",
    "importedAt": "2026-10-24T01:56:26.894Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "Talkyard - Host-Header Injection Leads to Account Takeover",
      "summary": "In Talkyard, versions v0.04.01 through v0.6.74-WIP-63220cb, v0.2020.22-WIP-b2e97fe0e through v0.2021.02-WIP-879ef3fe1 and tyse-v0.2021.02-879ef3fe1-regular through tyse-v0.2021.28-af66b6905-regular, are vulnerable to Host Header Injection. By luring a victim application-user to click on a link, an unauthenticated attacker can use the “forgot password” functionality to reset the victim’s password and successfully take over their account.",
      "affected": [
        {
          "vendor": "debiki",
          "product": "talkyard",
          "versions": [
            {
              "version": "v0.04.01",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "v0*"
            },
            {
              "version": "v0.2020.22-WIP-b2e97fe0e",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "v0.2020*"
            },
            {
              "version": "v0.2021",
              "status": "affected",
              "versionType": "custom",
              "lessThanOrEqual": "v0.2021.02-WIP-879ef3fe1"
            },
            {
              "version": "tyse-v0.2021.02-879ef3fe1-regular",
              "status": "affected",
              "versionType": "custom",
              "lessThan": "tyse-v0.2021*"
            }
          ]
        }
      ]
    }
  }
}