CVE-2026-21883

{"id": "CVE-2026-21883", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21883", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-01-08T16:41:08.716654Z"}}], "cvssMetricV31": [{"type": "Primary", "source": "nvd@nist.gov", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.4, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "impactScore": 2.5, "exploitabilityScore": 2.8}], "cvssMetricV40": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"Safety": "NOT_DEFINED", "version": "4.0", "Recovery": "NOT_DEFINED", "baseScore": 4.5, "Automatable": "NOT_DEFINED", "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "exploitMaturity": "UNREPORTED", "providerUrgency": "NOT_DEFINED", "userInteraction": "ACTIVE", "attackComplexity": "LOW", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "subIntegrityImpact": "NONE", "vulnIntegrityImpact": "HIGH", "integrityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "subAvailabilityImpact": "NONE", "vulnAvailabilityImpact": "NONE", "availabilityRequirement": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "subConfidentialityImpact": "NONE", "vulnConfidentialityImpact": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED"}}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "bokeh", "product": "bokeh", "versions": [{"status": "affected", "version": "< 3.8.2"}]}]}], "published": "2026-01-08T02:15:53.950", "references": [{"url": "https://github.com/bokeh/bokeh/commit/cedd113b0e271b439dce768671685cf5f861812e", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/bokeh/bokeh/security/advisories/GHSA-793v-589g-574v", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://aydinnyunus.github.io/2026/01/24/bokeh-websocket-hijacking-cve-2026-21883/", "tags": ["Exploit", "Mitigation", "Third Party Advisory"], "source": "af854a3a-2127-422b-91ae-364da2661108"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-1385"}]}], "descriptions": [{"lang": "en", "value": "Bokeh is an interactive visualization library written in Python. In versions 3.8.1 and below, if a server is configured with an allowlist (e.g., dashboard.corp), an attacker can register a domain like dashboard.corp.attacker.com (or use a subdomain if applicable) and lure a victim to visit it. The malicious site can then initiate a WebSocket connection to the vulnerable Bokeh server. Since the Origin header (e.g., http://dashboard.corp.attacker.com/) matches the allowlist according to the flawed logic, the connection is accepted. Once connected, the attacker can interact with the Bokeh server on behalf of the victim, potentially accessing sensitive data, or modifying visualizations. This issue is fixed in version 3.8.2."}, {"lang": "es", "value": "Bokeh es una biblioteca de visualizaci\u00f3n interactiva escrita en Python. En las versiones 3.8.1 e inferiores, si un servidor est\u00e1 configurado con una lista de permitidos (por ejemplo, dashboard.corp), un atacante puede registrar un dominio como dashboard.corp.attacker.com (o usar un subdominio si corresponde) y atraer a una v\u00edctima para que lo visite. El sitio malicioso puede entonces iniciar una conexi\u00f3n WebSocket al servidor Bokeh vulnerable. Dado que el encabezado Origin (por ejemplo, HTTP://dashboard.corp.attacker.com/) coincide con la lista de permitidos seg\u00fan la l\u00f3gica defectuosa, la conexi\u00f3n es aceptada. Una vez conectado, el atacante puede interactuar con el servidor Bokeh en nombre de la v\u00edctima, potencialmente accediendo a datos sensibles o modificando visualizaciones. Este problema est\u00e1 solucionado en la versi\u00f3n 3.8.2."}], "lastModified": "2026-06-17T10:19:05.170", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:bokeh:bokeh:*:*:*:*:*:python:*:*", "vulnerable": true, "matchCriteriaId": "9F5AC308-2F7D-4567-894B-E7417523D04B", "versionEndExcluding": "3.8.2"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}