[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fhPl8Hv-jPseqyxR7Ky-NOO-_LvzIBQIeP2LDTdV595Q":3,"g5a-risk:CVE-2023-30861":129},{"success":4,"data":5,"meta":126},true,{"cveId":6,"title":7,"description":8,"shortDescription":9,"publishedDate":10,"lastModified":11,"cvssScore":12,"cvssVector":13,"cvssMetrics":14,"epssScore":33,"epssPercentile":26,"epssTimeSeries":34,"severity":35,"affectedProducts":36,"affectedProductsCount":42,"references":43,"referencesCount":74,"weaknesses":75,"weaknessesCount":42,"isActivelyExploited":84,"cisaInfo":26,"otxData":26,"relatedBlogPosts":85,"seoMetadata":86,"configurations":111,"relatedVendorCves":124,"notableEvents":125},"CVE-2023-30861","What is CVE-2023-30861?","Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for one client may be cached and subsequently sent by the proxy to other clients. If the proxy also caches `Set-Cookie` headers, it may send one client's `session` cookie to other clients. The severity depends on the application's use of the session and the proxy's behavior regarding cookies. The risk depends on all these conditions being met.\n\n1. The application must be hosted behind a caching proxy that does not strip cookies or ignore responses with cookies.\n2. The application sets `session.permanent = True`\n3. The application does not access or modify the session at any point during a request.\n4. `SESSION_REFRESH_EACH_REQUEST` enabled (the default).\n5. The application does not set a `Cache-Control` header to indicate that a page is private or should not be cached.\n\nThis happens because vulnerable versions of Flask only set the `Vary: Cookie` header when the session is accessed or modified, not when it is refreshed (re-sent to update the expiration) without being accessed or modified. This issue has been fixed in versions 2.3.2 and 2.2.5.","Flask is a lightweight WSGI web application framework. When all of the following conditions are met, a response containing data intended for one client may b...","2023-05-02T18:15:52.373","2023-08-20T21:15:09.46",7.5,"CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:U\u002FC:H\u002FI:N\u002FA:N",{"CVSSMetricV31":15,"CVSSMetricV30":26,"CVSSMetricV2":26,"CVSSMetricV40":26},[16,29],{"Source":17,"Type":18,"CVSSData":19,"ExploitabilityScore":27,"ImpactScore":28},"nvd@nist.gov","Primary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":25,"IntegrityImpact":23,"AvailabilityImpact":23,"BaseScore":12,"BaseSeverity":25,"ExploitCodeMaturity":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"TemporalSeverity":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":23,"ModifiedAttackVector":26,"ModifiedAttackComplexity":26,"ModifiedPrivilegesRequired":26,"ModifiedUserInteraction":26,"ModifiedScope":26,"ModifiedConfidentialityImpact":26,"ModifiedIntegrityImpact":26,"ModifiedAvailabilityImpact":26,"EnvironmentalScore":26,"EnvironmentalSeverity":26},"3.1","NETWORK","LOW","NONE","UNCHANGED","HIGH",null,3.9,3.6,{"Source":30,"Type":31,"CVSSData":32,"ExploitabilityScore":27,"ImpactScore":28},"security-advisories@github.com","Secondary",{"Version":20,"VectorString":13,"AttackVector":21,"AttackComplexity":22,"PrivilegesRequired":23,"UserInteraction":23,"Scope":24,"ConfidentialityImpact":25,"IntegrityImpact":23,"AvailabilityImpact":23,"BaseScore":12,"BaseSeverity":25,"ExploitCodeMaturity":26,"RemediationLevel":26,"ReportConfidence":26,"TemporalScore":26,"TemporalSeverity":26,"ConfidentialityRequirement":26,"IntegrityRequirement":26,"AvailabilityRequirement":23,"ModifiedAttackVector":26,"ModifiedAttackComplexity":26,"ModifiedPrivilegesRequired":26,"ModifiedUserInteraction":26,"ModifiedScope":26,"ModifiedConfidentialityImpact":26,"ModifiedIntegrityImpact":26,"ModifiedAvailabilityImpact":26,"EnvironmentalScore":26,"EnvironmentalSeverity":26},0.01261,[33,33,33,33,33,33,33],"High",[37],{"vendor":38,"product":39,"version":40,"criteria":41,"vulnerable":4},"palletsprojects","flask","*","cpe:2.3:a:palletsprojects:flask:*:*:*:*:*:*:*:*",1,[44,49,52,56,59,63,67,71],{"url":45,"source":46,"tags":47},"https:\u002F\u002Fgithub.com\u002Fpallets\u002Fflask\u002Fcommit\u002F70f906c51ce49c485f1d355703e9cc3386b1cc2b","GitHub",[48],"Patch",{"url":50,"source":46,"tags":51},"https:\u002F\u002Fgithub.com\u002Fpallets\u002Fflask\u002Fcommit\u002Fafd63b16170b7c047f5758eb910c416511e9c965",[48],{"url":53,"source":46,"tags":54},"https:\u002F\u002Fgithub.com\u002Fpallets\u002Fflask\u002Freleases\u002Ftag\u002F2.2.5",[55],"Release Notes",{"url":57,"source":46,"tags":58},"https:\u002F\u002Fgithub.com\u002Fpallets\u002Fflask\u002Freleases\u002Ftag\u002F2.3.2",[55],{"url":60,"source":46,"tags":61},"https:\u002F\u002Fgithub.com\u002Fpallets\u002Fflask\u002Fsecurity\u002Fadvisories\u002FGHSA-m2qf-hxjv-5gpq",[62],"Vendor Advisory",{"url":64,"source":65,"tags":66},"https:\u002F\u002Flists.debian.org\u002Fdebian-lts-announce\u002F2023\u002F08\u002Fmsg00024.html","Debian",[],{"url":68,"source":69,"tags":70},"https:\u002F\u002Fsecurity.netapp.com\u002Fadvisory\u002Fntap-20230818-0006\u002F","Netapp",[],{"url":72,"source":65,"tags":73},"https:\u002F\u002Fwww.debian.org\u002Fsecurity\u002F2023\u002Fdsa-5442",[],8,[76],{"id":77,"name":78,"description":79,"extendedDescription":80,"status":81,"abstraction":82,"structure":83},"CWE-539","Use of Persistent Cookies Containing Sensitive Information","The web application uses persistent cookies, but the cookies contain sensitive information.","Cookies are small bits of data that are sent by the web application but stored locally in the browser. This lets the application use the cookie to pass information between pages and store variable information. The web application controls what information is stored in a cookie and how it is used. Typical types of information stored in cookies are session identifiers, personalization and customization information, and in rare cases even usernames to enable automated logins. There are two different types of cookies: session cookies and persistent cookies. Session cookies just live in the browser's memory and are not stored anywhere, but persistent cookies are stored on the browser's hard drive.   This can cause security and privacy issues depending on the information stored in the cookie and how it is accessed.","Incomplete","Variant","Simple",false,[],{"title":87,"metaDescription":88,"keywords":89,"canonicalUrl":90,"structuredData":91},"What is CVE-2023-30861? Vulnerability Analysis | Security Advisory | Precursor Intelligence","Comprehensive analysis of CVE-2023-30861, a high severity cyber security vulnerability from 2023. Flask is a lightweight WSGI web application framework. When...","CVE-2023-30861, CVE-2023-30861 vulnerability, CVE-2023-30861 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research, vulnerability assessment, cyber threats, 2023, CVSS score, exploit, patch, remediation, palletsprojects security, flask vulnerability","\u002Fwhat-is\u002Fcve-2023-30861",{"@context":92,"@type":93,"headline":87,"description":88,"datePublished":10,"dateModified":11,"author":94,"publisher":98,"about":102,"mainEntityOfPage":106,"articleSection":109,"keywords":110},"https:\u002F\u002Fschema.org","TechArticle",{"@type":95,"name":96,"url":97},"Organization","Precursor Intelligence","https:\u002F\u002Fprecursorintelligence.com",{"@type":95,"name":96,"url":97,"logo":99},{"@type":100,"url":101},"ImageObject","https:\u002F\u002Fprecursorintelligence.com\u002Fimg\u002Flogos\u002Feplogo.png",{"@type":103,"name":6,"description":104,"additionalType":105},"Thing","Cybersecurity Vulnerability","https:\u002F\u002Fschema.org\u002FSoftwareBug",{"@type":107,"@id":108},"WebPage","https:\u002F\u002Fprecursorintelligence.com\u002Fwhat-is\u002Fcve-2023-30861","Cybersecurity","CVE-2023-30861, CVE-2023-30861 vulnerability, CVE-2023-30861 security, high severity vulnerability, cybersecurity, vulnerability analysis, security advisory, CVE database, threat intelligence, security research",[112],{"Operator":26,"Negate":26,"Nodes":113},[114],{"Operator":115,"Negate":26,"CPEMatch":116},"OR",[117,120],{"Vulnerable":4,"Criteria":41,"MatchCriteriaID":118,"VersionStartExcluding":26,"VersionStartIncluding":26,"VersionEndExcluding":119,"VersionEndIncluding":26},"D663DAAF-D84C-4510-98CE-D24A4034CF18","2.2.5",{"Vulnerable":4,"Criteria":41,"MatchCriteriaID":121,"VersionStartExcluding":26,"VersionStartIncluding":122,"VersionEndExcluding":123,"VersionEndIncluding":26},"6DE28F1D-750A-445D-8706-17E6F1E20F64","2.3.0","2.3.2",[],[],{"lastModified":11,"cacheTime":127,"version":128},1792283858973,"2.0",{"score":130,"band":131,"action":132,"scoredAt":133},46,"Medium","Plan remediation","2026-10-16T06:57:52.200026+00:00"]