Expand intel coverage and refresh monitoring
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---
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title: "Flask session does not add `Vary: Cookie` header when accessed in some ways"
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system_id: "flask"
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category: "frameworks"
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advisory_mode: "core"
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published_date: "2026-02-19T20:45:41Z"
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updated_date: "2026-02-23T23:43:45.778179Z"
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severity: "medium"
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exploit_status: "unknown"
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source_confidence: "official"
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verification_status: "triage-manual"
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verification_mode: "synthetic"
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artifact_mode: "synthetic"
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last_run_id: ""
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target_types:
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- "lab-local"
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- "lab-public"
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- "authorized-third-party"
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allow_public_validation: "yes, with ownership or explicit authorization"
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authorization_prerequisite: "asset ownership proof or explicit written authorization"
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minimal_validation: "read-only probe, controlled payload, reversible test"
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aliases:
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- "CVE-2026-27205"
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- "GHSA-68rp-wp8r-4726"
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affected_versions:
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- "0.1"
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- "0.10"
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- "0.10.1"
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- "0.11"
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- "0.11.1"
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- "0.12"
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- "0.12.1"
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- "0.12.2"
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- "0.12.3"
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- "0.12.4"
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- "0.12.5"
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- "0.2"
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- "0.3"
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- "0.3.1"
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- "0.4"
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- "0.5"
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- "0.5.1"
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- "0.5.2"
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- "0.6"
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- "0.6.1"
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fixed_versions:
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- "3.1.3"
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secure_code_topics:
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- "xss-output-encoding"
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- "ssrf-url-validation"
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- "token-cookie-storage"
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- "proxy-trust-boundary"
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primary_source: "https://github.com/pallets/flask/security/advisories/GHSA-68rp-wp8r-4726"
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---
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# Flask session does not add `Vary: Cookie` header when accessed in some ways
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## 本地实证状态
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- 实证状态: `triage-manual`
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- 实证方式: `synthetic`
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- Artifact 模式: `synthetic`
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- 最近运行: `-`
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- 浏览器证据: `missing`
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- Run Bundle: `-`
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## 事件层
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- Canonical ID: `flask--CVE-2026-27205`
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- 系统: `flask`
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- 严重度: `medium`
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- 来源置信度: `official`
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- 官方主源: https://github.com/pallets/flask/security/advisories/GHSA-68rp-wp8r-4726
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- 影响版本: `0.1, 0.10, 0.10.1, 0.11, 0.11.1, 0.12, 0.12.1, 0.12.2, 0.12.3, 0.12.4`
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- 修复版本: `3.1.3`
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## 其他来源
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- https://nvd.nist.gov/vuln/detail/CVE-2026-27205
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- https://github.com/pallets/flask/commit/089cb86dd22bff589a4eafb7ab8e42dc357623b4
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- https://github.com/pallets/flask
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- https://github.com/pallets/flask/releases/tag/3.1.3
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## 实验层
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- 仅用于自有资产、测试环境或已明确授权目标。
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- 允许公网可达目标，但必须满足资产归属或明确授权前提。
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- 最小化验证方式: 最小化验证、只读探测、可审计回显、受控注入。
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- 若该案例涉及插件、模块或扩展，应同时检查供应链与升级策略。
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- 禁止场景: 无归属证明或无明确授权的公网目标；知名公共网站或与测试无关的第三方资产；会造成持久破坏、数据越权下载或不可回滚影响的动作
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## 修复示例
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- [javascript-typescript:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/javascript-typescript/xss-output-encoding.md)
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- [nodejs:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/nodejs/xss-output-encoding.md)
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- [java:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/java/xss-output-encoding.md)
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- [php:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/php/xss-output-encoding.md)
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- [python:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/python/xss-output-encoding.md)
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- [ruby:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/ruby/xss-output-encoding.md)
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- [csharp:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/csharp/xss-output-encoding.md)
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- [go:xss-output-encoding](/Users/x/websafe/05-defense/secure-code/go/xss-output-encoding.md)
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- [javascript-typescript:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/javascript-typescript/ssrf-url-validation.md)
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- [nodejs:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/nodejs/ssrf-url-validation.md)
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- [java:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/java/ssrf-url-validation.md)
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- [php:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/php/ssrf-url-validation.md)
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- [python:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/python/ssrf-url-validation.md)
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- [ruby:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/ruby/ssrf-url-validation.md)
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- [csharp:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/csharp/ssrf-url-validation.md)
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- [go:ssrf-url-validation](/Users/x/websafe/05-defense/secure-code/go/ssrf-url-validation.md)
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- [javascript-typescript:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/javascript-typescript/token-cookie-storage.md)
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- [nodejs:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/nodejs/token-cookie-storage.md)
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- [java:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/java/token-cookie-storage.md)
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- [php:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/php/token-cookie-storage.md)
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- [python:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/python/token-cookie-storage.md)
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- [ruby:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/ruby/token-cookie-storage.md)
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- [csharp:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/csharp/token-cookie-storage.md)
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- [go:token-cookie-storage](/Users/x/websafe/05-defense/secure-code/go/token-cookie-storage.md)
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- [javascript-typescript:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/javascript-typescript/proxy-trust-boundary.md)
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- [nodejs:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/nodejs/proxy-trust-boundary.md)
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- [java:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/java/proxy-trust-boundary.md)
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- [php:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/php/proxy-trust-boundary.md)
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- [python:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/python/proxy-trust-boundary.md)
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- [ruby:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/ruby/proxy-trust-boundary.md)
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- [csharp:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/csharp/proxy-trust-boundary.md)
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- [go:proxy-trust-boundary](/Users/x/websafe/05-defense/secure-code/go/proxy-trust-boundary.md)
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