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CVE-2026-73155— cti-transmute Missing Authorization Allows Reactions to Private Comments

Quick assessment

Affected
MISP cti-transmute
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.

MISP cti-transmute是MISP组织的一款威胁情报数据格式转换工具。 MISP cti-transmute 1.4.0及之前版本存在授权问题漏洞，该漏洞源于未正确实施访问控制，react()处理程序在仅验证comment_id语法和表情符号允许后，未检查用户是否有权查看目标评论，将攻击者控制的comment_id直接传递给comments_repo.toggle_reaction()，导致用户可修改私有或不可访问评论的反应状态。

CVSS 5.3 · Medium EPSS 0.35% · P28

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token

Affected Version Matrix 1

VendorProduct Version RangeStatus
MISP cti-transmute ≤ 1.4.0 affected
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I. Basic Information for CVE-2026-73155

Vulnerability Information
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Vulnerability Title
cti-transmute Missing Authorization Allows Reactions to Private Comments
Source: CVE Program / CVE List V5
Vulnerability Description
Affected versions of cti-transmute allow authenticated users to add or remove emoji reactions on comments without first checking whether those users are authorized to view the target comment. The vulnerable react() handler passed an attacker-controlled comment_id directly to comments_repo.toggle_reaction() after only validating that the ID existed syntactically and that the requested emoji was permitted. Because comment-level visibility was not enforced, a user who could identify the ID of a private or otherwise inaccessible comment could modify reaction state on that comment despite lacking permission to access it. The fix retrieves the target comment, rejects missing or deleted comments, retrieves its associated conversion, and enforces access.can_see_comment(current_user, comment, conversion). Unauthorized requests now receive HTTP 403.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
MISP cti-transmute 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MISP cti-transmute是MISP组织的一款威胁情报数据格式转换工具。 MISP cti-transmute 1.4.0及之前版本存在授权问题漏洞，该漏洞源于未正确实施访问控制，react()处理程序在仅验证comment_id语法和表情符号允许后，未检查用户是否有权查看目标评论，将攻击者控制的comment_id直接传递给comments_repo.toggle_reaction()，导致用户可修改私有或不可访问评论的反应状态。
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
MISP cti-transmute 0 ~ 1.4.0 -

II. Public POCs for CVE-2026-73155

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III. Intelligence Information for CVE-2026-73155

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Same Patch Batch · MISP · 2026-08-11 · 9 CVEs total

CVE-2026-73160 8.7 HIGH cti-transmute Unauthenticated SSRF via Hostnames Resolving to Internal IP Addresses
CVE-2026-73140 5.3 MEDIUM cti-transmute Evaluation Report Exports Expose Private Comments and Author Information
CVE-2026-73156 5.3 MEDIUM cti-transmute Sunburst and Treemap Tooltips Allow Cross-Site Scripting via Crafted Convers
CVE-2026-73162 5.3 MEDIUM cti-transmute CSRF Allows Unauthorized Follow and Notification State Changes
CVE-2026-73158 5.1 MEDIUM cti-transmute Saved Graph Configuration Allows Stored Cross-Site Scripting via svgIcon
CVE-2026-73159 5.1 MEDIUM cti-transmute Stored XSS via Crafted Tag Icon on Admin Triage Interface
CVE-2026-73161 5.1 MEDIUM cti-transmute Conversion Table Allows XSS via Unescaped Cell Content During Search Highlig
CVE-2026-73157 2.3 LOW cti-transmute Remote MISP Event Browser Allows Cross-Site Scripting via Malicious Event Me

IV. Related Vulnerabilities

Same product: cti-transmute
Same vendor: MISP
Same weakness: CWE-862