Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-103655— MISP TOTP Code Replay Allows Duplicate Authentication Within Validity Period

Quick assessment

Affected
MISP MISP
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 在其双因素认证（TOTP）验证流程中存在一个漏洞，允许有效的一次性验证码在其基于时间的有效期内被多次接受。 该问题存在于用户登录流程中，其中 TOTP 代码作为第二认证因子进行验证。由于系统未记录某个特定的 TOTP 时间窗口是否已被使用过，同一验证码在其整个有效时间窗口内（通常为 30 秒）保持有效。攻击者如果在用户合法登录过程中截获了有效的验证码，可以重放该代码以冒充该用户认证第二个会话。 前提条件： 目标用户已启用基于 TOTP 的双因素认证。 攻击者能够观察或拦截用户在合法登录过程中输入的 TOT

CVSS 9.3 · Critical

Possible ATT&CK Techniques 1 AI

T1567.002 · Exfiltration to Cloud Storage
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-103655

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
MISP TOTP Code Replay Allows Duplicate Authentication Within Validity Period
Source: CVE Program / CVE List V5
Vulnerability Description
MISP contains a vulnerability in its two-factor authentication (TOTP) verification process that permits a valid one-time code to be accepted more than once within its time-based validity window. The issue exists in the user login flow where a TOTP code is verified as a second authentication factor. Because the system did not record whether a given TOTP period had already been consumed, the same code remained valid for its entire time window (typically 30 seconds). An attacker who captures a legitimate code during a user's login could replay it to authenticate a second session as that user. Preconditions: - The target user has TOTP-based two-factor authentication enabled. - The attacker is in a position to observe or intercept the TOTP code during a legitimate login (e.g., network-level interception, shoulder surfing, or a compromised client). - The replay must occur within the TOTP validity period. Security impact: - Unauthorized account access by replaying a captured one-time code. - Potential compromise of threat-intelligence data and administrative functions accessible to the targeted user. Affected versions: <v2.5.48.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
MISP MISP 0 ~ 2.5.48 cpe:2.3:a:misp:misp:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-103655

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-103655

请登录查看更多情报信息。

Other References for CVE-2026-103655 (1)

Same Patch Batch · MISP · 2026-10-01 · 6 CVEs total

CVE-2026-103651 7.6 HIGH MISP HOTP Token Replay via Stale Session-Cached Counter Allows Second-Factor Authenticatio
CVE-2026-103659 7.1 HIGH MISP: Object Distribution ACL Bypass via Event Flattening Exposes Organisation-Only Attrib
CVE-2026-103858 5.3 MEDIUM MISP Incomplete Thread Authorization Allows Unauthorized Read and Post Access to Discussio
CVE-2026-103662 5.1 MEDIUM MISP Reflected XSS in Taxonomy Tag Confirmation Forms
CVE-2026-103664 4.8 MEDIUM MISP Reflected Cross-Site Scripting via Unsanitized Analyst Data Seed Parameter

IV. Related Vulnerabilities

Same product: MISP
Same vendor: MISP
Same weakness: CWE-294

V. Comments for CVE-2026-103655

No comments yet

Leave a comment