FKIE_CVE-2026-27737

Vulnerability from fkie_nvd - Published: 2026-05-18 22:16 - Updated: 2026-06-17 10:27
Severity
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Summary
BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user's input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19.
References
security-advisories@github.comhttps://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1
security-advisories@github.comhttps://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc
security-advisories@github.comhttps://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19
security-advisories@github.comhttps://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv
security-advisories@github.comhttps://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "bigbluebutton",
          "vendor": "bigbluebutton",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 3.0.19"
            }
          ]
        },
        {
          "product": "scalite",
          "vendor": "blindsidenetworks",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 1.7.0"
            }
          ]
        },
        {
          "product": "bbb-playback",
          "vendor": "bigbluebutton",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 5.4.3"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "BigBlueButton is an open-source virtual classroom. In versions prior to 3.0.19, the recording playback (presentation format) was not sanitizing user\u0027s input in public chat. This allowed for a malicious actor to craft and carry out a targeted XSS attack, activated on anyone replaying the recording. This issue has been fixed 3.0.19."
    }
  ],
  "id": "CVE-2026-27737",
  "lastModified": "2026-06-17T10:27:36.137",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-27737",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-05-19T12:11:45.789071Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-05-18T22:16:37.523",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bigbluebutton/bbb-playback/commit/09e89bfe4ff8488b68c3ff040d3081e419dc89b1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bigbluebutton/bigbluebutton/commit/69f45aa1b963dc7d80179d0155acc670aec5c4fc"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bigbluebutton/bigbluebutton/releases/tag/v3.0.19"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/bigbluebutton/bigbluebutton/security/advisories/GHSA-8vv7-vj94-q2pv"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/blindsidenetworks/scalelite/releases/tag/v1.7.0"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-79"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.