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CVE-2026-81827— Flowintel Login Email Validation Bypass Allows Log Injection via Crafted Email Input

Quick assessment

Affected
flowintel flowintel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

flowintel是flowintel团队开源的一款威胁情报与威胁分析管理平台。 flowintel 3.3.0及之前版本存在输入验证错误漏洞，该漏洞源于调用Email(email)校验登录邮箱地址时未正确执行WTForms字段验证，导致格式错误的邮箱输入通过登录流程并写入安全日志，且未转义CR/LF字符，可能允许未经身份验证的攻击者注入日志行或伪造误导性日志条目。

CVSS 6.9 · Medium EPSS 0.43% · P36

Possible ATT&CK Techniques 1 AI

T1120 · Peripheral Device Discovery

Affected Version Matrix 1

VendorProduct Version RangeStatus
flowintel flowintel ≤ 3.3.0 affected
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I. Basic Information for CVE-2026-81827

Vulnerability Information
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Vulnerability Title
Flowintel Login Email Validation Bypass Allows Log Injection via Crafted Email Input
Source: CVE Program / CVE List V5
Vulnerability Description
Affected versions of Flowintel incorrectly attempted to validate login email addresses by calling Email(email). That does not perform WTForms field validation; it merely constructs a validator object. Consequently, malformed attacker-controlled email input could continue through the login process and be written to security-relevant logs. The vulnerable code inserted the supplied email into both a warning log and the custom audit logger. Since CR/LF characters were not escaped, an unauthenticated attacker could potentially inject additional physical log lines or forge misleading log entries. The patch corrects the validation call to Email()(form, form.email), changes the standard logging call to parameterized logging, and introduces _sanitize_log_fragment() so carriage returns and line feeds are encoded instead of creating new records. Version impacted >=3.3.0
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
flowintel 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
flowintel是flowintel团队开源的一款威胁情报与威胁分析管理平台。 flowintel 3.3.0及之前版本存在输入验证错误漏洞，该漏洞源于调用Email(email)校验登录邮箱地址时未正确执行WTForms字段验证，导致格式错误的邮箱输入通过登录流程并写入安全日志，且未转义CR/LF字符，可能允许未经身份验证的攻击者注入日志行或伪造误导性日志条目。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
flowintel flowintel 0 ~ 3.3.0 -

II. Public POCs for CVE-2026-81827

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III. Intelligence Information for CVE-2026-81827

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Patches & Fixes for CVE-2026-81827 (1)

Same Patch Batch · flowintel · 2026-08-27 · 11 CVEs total

CVE-2026-81826 9.1 CRITICAL Flowintel Fails to Invalidate Active Sessions After Password Change
CVE-2026-81662 8.6 HIGH Flowintel Alert Settings Configuration Allows Remote Code Execution via Arbitrary Configur
CVE-2026-81818 8.6 HIGH Flowintel Organization Administrator Can Reset Full Administrator Password and Escalate Pr
CVE-2026-81743 7.5 HIGH Flowintel Arbitrary Log File Path Allows Remote Code Execution via Template Injection
CVE-2026-81817 7.2 HIGH Flowintel Missing Task-to-Case Authorization Allows Cross-Case Task Modification
CVE-2026-81659 7.1 HIGH Flowintel Note PDF Export Allows Arbitrary Local File Read via Pandoc/XeLaTeX Processing
CVE-2026-81819 5.3 MEDIUM Flowintel Missing Authorization Allows Regular API Users to View Other Users’ Task Assignm
CVE-2026-81814 5.1 MEDIUM Flowintel Stored XSS in Calendar via Malicious Case Title
CVE-2026-81753 5.1 MEDIUM Flowintel Stored XSS in Case Notes via Malicious Mermaid Diagram Content
CVE-2026-81820 5.1 MEDIUM Flowintel HTML Injection in MISP Case History Timeline via Crafted Object Attributes

IV. Related Vulnerabilities

Same product: flowintel
Same vendor: flowintel
Same weakness: CWE-20

V. Comments for CVE-2026-81827

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