[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fni0ok8daWfSUyJHn4qjMKMZG4c4qHOaz9eM62l29YQA":3,"g5a-risk:CVE-2020-26250":122},{"success":4,"data":5,"meta":120},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":44,"epssPercentile":27,"epssTimeSeries":45,"severity":46,"affectedProducts":47,"affectedProductsCount":53,"references":54,"referencesCount":29,"weaknesses":72,"weaknessesCount":53,"isActivelyExploited":81,"cisaInfo":27,"otxData":27,"relatedBlogPosts":82,"seoMetadata":83,"configurations":108,"relatedVendorCves":118,"notableEvents":119},"CVE-2020-26250","What is CVE-2020-26250?","OAuthenticator is an OAuth login mechanism for JupyterHub. In oauthenticator from version 0.12.0 and before 0.12.2, the deprecated (in jupyterhub 1.2) configuration `Authenticator.whitelist`, which should be transparently mapped to `Authenticator.allowed_users` with a warning, is instead ignored by OAuthenticator classes, resulting in the same behavior as if this configuration has not been set. If this is the only mechanism of authorization restriction (i.e. no group or team restrictions in configuration) then all authenticated users will be allowed. Provider-based restrictions, including deprecated values such as `GitHubOAuthenticator.org_whitelist` are **not** affected. All users of OAuthenticator 0.12.0 and 0.12.1 with JupyterHub 1.2 (JupyterHub Helm chart 0.10.0-0.10.5) who use the `admin.whitelist.users` configuration in the jupyterhub helm chart or the `c.Authenticator.whitelist` configuration directly. Users of other deprecated configuration, e.g. `c.GitHubOAuthenticator.team_whitelist` are **not** affected. If you see a log line like this and expect a specific list of allowed usernames: \"[I 2020-11-27 16:51:54.528 JupyterHub app:1717] Not using allowed_users. Any authenticated user will be allowed.\" you are likely affected. Updating oauthenticator to 0.12.2 is recommended. A workaround is to replace the deprecated `c.Authenticator.whitelist = ...` with `c.Authenticator.allowed_users = ...`. If any users have been authorized during this time who should not have been, they must be deleted via the API or admin interface, per the referenced documentation.","OAuthenticator is an OAuth login mechanism for JupyterHub. In oauthenticator from version 0.12.0 and before 0.12.2, the deprecated (in jupyterhub 1.2) config...","2020-12-01T21:15:14.317","2020-12-08T17:50:24.337",6.3,"CVSS:3.1\u002FAV:N\u002FAC:H\u002FPR:L\u002FUI:N\u002FS:C\u002FC:H\u002FI:N\u002FA:N",{"CVSSMetricV31":15,"CVSSMetricV30":27,"CVSSMetricV2":34,"CVSSMetricV40":27},[16,30],{"Source":17,"Type":18,"CVSSData":19,"ExploitabilityScore":28,"ImpactScore":29},"nvd@nist.gov","Primary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":24,"Scope":25,"ConfidentialityImpact":22,"IntegrityImpact":24,"AvailabilityImpact":24,"BaseScore":12,"BaseSeverity":26,"ExploitCodeMaturity":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"TemporalSeverity":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":24,"ModifiedAttackVector":27,"ModifiedAttackComplexity":27,"ModifiedPrivilegesRequired":27,"ModifiedUserInteraction":27,"ModifiedScope":27,"ModifiedConfidentialityImpact":27,"ModifiedIntegrityImpact":27,"ModifiedAvailabilityImpact":27,"EnvironmentalScore":27,"EnvironmentalSeverity":27},"3.1","NETWORK","HIGH","LOW","NONE","CHANGED","MEDIUM",null,1.8,4,{"Source":31,"Type":32,"CVSSData":33,"ExploitabilityScore":28,"ImpactScore":29},"security-advisories@github.com","Secondary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":24,"Scope":25,"ConfidentialityImpact":22,"IntegrityImpact":24,"AvailabilityImpact":24,"BaseScore":12,"BaseSeverity":26,"ExploitCodeMaturity":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"TemporalSeverity":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":24,"ModifiedAttackVector":27,"ModifiedAttackComplexity":27,"ModifiedPrivilegesRequired":27,"ModifiedUserInteraction":27,"ModifiedScope":27,"ModifiedConfidentialityImpact":27,"ModifiedIntegrityImpact":27,"ModifiedAvailabilityImpact":27,"EnvironmentalScore":27,"EnvironmentalSeverity":27},[35],{"Source":17,"Type":18,"CVSSData":36,"BaseSeverity":23,"ExploitabilityScore":42,"ImpactScore":43,"ACInsufInfo":27,"ObtainAllPrivilege":27,"ObtainUserPrivilege":27,"ObtainOtherPrivilege":27,"UserInteractionRequired":27},{"Version":37,"VectorString":38,"AccessVector":21,"AccessComplexity":26,"Authentication":39,"ConfidentialityImpact":40,"IntegrityImpact":24,"AvailabilityImpact":24,"BaseScore":41,"BaseSeverity":27,"Exploitability":27,"RemediationLevel":27,"ReportConfidence":27,"TemporalScore":27,"CollateralDamagePotential":27,"TargetDistribution":27,"ConfidentialityRequirement":27,"IntegrityRequirement":27,"AvailabilityRequirement":27,"EnvironmentalScore":27},"2.0","AV:N\u002FAC:M\u002FAu:S\u002FC:P\u002FI:N\u002FA:N","SINGLE","PARTIAL",3.5,6.8,2.9,0.01132,[44,44,44,44,44,44,44],"Medium",[48],{"vendor":49,"product":50,"version":51,"criteria":52,"vulnerable":4},"jupyter","oauthenticator","*","cpe:2.3:a:jupyter:oauthenticator:*:*:*:*:*:*:*:*",1,[55,61,65,68],{"url":56,"source":57,"tags":58},"https:\u002F\u002Fgithub.com\u002Fjupyterhub\u002Foauthenticator\u002Fblob\u002Fmaster\u002Fdocs\u002Fsource\u002Fchangelog.md#0122---2020-11-30","GitHub",[59,60],"Release Notes","Third Party Advisory",{"url":62,"source":57,"tags":63},"https:\u002F\u002Fgithub.com\u002Fjupyterhub\u002Foauthenticator\u002Fcommit\u002Fa4aac191c16cf6281f3d346615aefa75702b02d7",[64,60],"Patch",{"url":66,"source":57,"tags":67},"https:\u002F\u002Fgithub.com\u002Fjupyterhub\u002Foauthenticator\u002Fsecurity\u002Fadvisories\u002FGHSA-384w-5v3f-q499",[60],{"url":69,"source":70,"tags":71},"https:\u002F\u002Fjupyterhub.readthedocs.io\u002Fen\u002F1.2.2\u002Fgetting-started\u002Fauthenticators-users-basics.html#add-or-remove-users-from-the-hub","Readthedocs",[60],[73],{"id":74,"name":75,"description":76,"extendedDescription":77,"status":78,"abstraction":79,"structure":80},"CWE-863","Incorrect Authorization","The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions.","Assuming a user with a given identity, authorization is the process of determining whether that user can access a given resource, based on the user's privileges and any permissions or other access-control specifications that apply to the resource.\nWhen access control checks are incorrectly applied, users are able to access data or perform actions that they should not be allowed to perform. This can lead to a wide range of problems, including information exposures, denial of service, and arbitrary code execution.","Incomplete","Class","Simple",false,[],{"title":84,"metaDescription":85,"keywords":86,"canonicalUrl":87,"structuredData":88},"What is CVE-2020-26250? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2020-26250, a medium severity cyber security vulnerability from 2020. OAuthenticator is an OAuth login mechanism for JupyterHub...","CVE-2020-26250, CVE-2020-26250 vulnerability, CVE-2020-26250 security, medium severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research, vulnerability assessment, cyber threats, 2020, CVSS score, exploit, patch, remediation, jupyter security, oauthenticator vulnerability","\u002Fwhat-is\u002Fcve-2020-26250",{"@context":89,"@type":90,"headline":84,"description":85,"datePublished":10,"dateModified":11,"author":91,"publisher":95,"about":99,"mainEntityOfPage":103,"articleSection":106,"keywords":107},"https:\u002F\u002Fschema.org","TechArticle",{"@type":92,"name":93,"url":94},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":92,"name":93,"url":94,"logo":96},{"@type":97,"url":98},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":100,"name":6,"description":101,"additionalType":102},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":104,"@id":105},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2020-26250","Cybersecurity","CVE-2020-26250, CVE-2020-26250 vulnerability, CVE-2020-26250 security, medium severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[109],{"Operator":27,"Negate":27,"Nodes":110},[111],{"Operator":112,"Negate":27,"CPEMatch":113},"OR",[114],{"Vulnerable":4,"Criteria":52,"MatchCriteriaID":115,"VersionStartExcluding":27,"VersionStartIncluding":116,"VersionEndExcluding":117,"VersionEndIncluding":27},"B843F30F-EB2C-4C27-8CB8-7DEF4FDA3B0A","0.12.0","0.12.2",[],[],{"lastModified":11,"cacheTime":121,"version":37},1792370485871,{"score":123,"band":124,"action":125,"scoredAt":126},21,"Low","Monitor","2026-10-16T06:49:57.946131+00:00"]