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

Goal: 1000 CNY · Raised: 1359 CNY

100%

Buy Us a Coffee

CVE-2026-123521— Vikunja before 2.7.1 Password Brute-Force via TOTP Disable Endpoint

Quick assessment

Affected

go-vikunja vikunja

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.

Vikunja 2.7.1 之前的版本存在“对过度认证尝试限制不当”的漏洞，允许持有会话的攻击者通过未实施速率限制的重新认证端点，对账户密码进行暴力破解。攻击者若窃取了有效会话，即可利用端点尝试猜测密码，且不会触发账户锁定机制；在成功猜解密码后，攻击者无需提供 TOTP 验证码即可禁用双因素认证，从而实现持久性的账户接管。

CVSS 5.9 · Medium Updated Nov 08, 2026

Possible ATT&CK Techniques 2 AI

T1550 · Use Alternate Authentication Material T1110.001 · Password Guessing

Get alerts for future matching vulnerabilities Log in to subscribe

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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

Vikunja before 2.7.1 Password Brute-Force via TOTP Disable Endpoint

Source: CVE Program / CVE List V5

Vulnerability Description

Vikunja before 2.7.1 contains an improper restriction of excessive authentication attempts vulnerability that allows session holders to brute-force account passwords via unthrottled re-authentication endpoints. Attackers with a stolen session can guess the password via /user/settings/totp/disable without lockout, then disable TOTP without a code for persistent account takeover.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N

Source: CVE Program / CVE List V5

Vulnerability Type

过多认证尝试的限制不恰当

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
go-vikunja	vikunja	0 ~ 2.7.1	-

II. Public POCs for CVE-2026-123521

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-123521

请登录查看更多情报信息。

Other References for CVE-2026-123521 (2)

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-49pj-52x6-8gpj vendor-advisory
https://www.vulncheck.com/advisories/vikunja-before-2.7.1-password-brute-force-via-totp-disable-endpoint third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-123521

Same Patch Batch · go-vikunja · 2026-11-08 · 39 CVEs total

CVE-2026-123531	8.8 HIGH	Vikunja 1.0.0 before 2.7.1 Pagination Limit Bypass via page=0 Parameter
CVE-2026-123522	7.1 HIGH	Vikunja before 2.7.1 Task Information Disclosure via Kanban Bucket Move Webhook
CVE-2026-123520	7.1 HIGH	Vikunja 0.18.0 before 2.7.1 Privilege Escalation via Account Deletion
CVE-2026-123497	6.8 MEDIUM	Vikunja veans before 2.7.1 HTTPS to HTTP Downgrade in Server Discovery
CVE-2026-123528	6.8 MEDIUM	Vikunja before 2.7.1 Insufficient Session Expiration via HTTP Token Middleware
CVE-2026-123513	6.8 MEDIUM	Vikunja before 2.7.1 Auth Token Leak via API URL Change
CVE-2026-123523	6.5 MEDIUM	Vikunja before 2.7.1 Memory Exhaustion via Unbounded Avatar Size Cache
CVE-2026-123519	6.5 MEDIUM	Vikunja before 2.7.1 Memory Exhaustion DoS via WeKan and Vikunja-File Imports
CVE-2026-123525	6.5 MEDIUM	Vikunja before 2.7.1 Memory Exhaustion DoS via Trello, Todoist and Microsoft To Do Migrati
CVE-2026-123501	6.5 MEDIUM	Vikunja before 2.7.1 Memory Exhaustion DoS via Unbounded Image Decodes
CVE-2026-123500	6.2 MEDIUM	Vikunja before 2.7.1 Insecure Permissions on Dump Archive via vikunja dump
CVE-2026-123512	6.1 MEDIUM	Vikunja before 2.7.1 Sensitive Token Exposure via URL Query in Access Logs
CVE-2026-123499	5.9 MEDIUM	Vikunja veans before 2.7.1 Credential Leak via Repo-Controlled .veans.yml Server
CVE-2026-123530	5.9 MEDIUM	Vikunja before 2.7.1 Missing Step-Up Authentication via TOTP Enrollment Endpoints
CVE-2026-123524	5.7 MEDIUM	Vikunja 0.23.0 before 2.7.1 Information Disclosure via Webhook related_tasks Payload
CVE-2026-123505	5.5 MEDIUM	Vikunja before 2.7.1 World-Readable Local File Storage and SQLite Database
CVE-2026-123526	5.4 MEDIUM	Vikunja before 2.7.1 Mass Assignment via Team external_id Field
CVE-2026-123506	5.4 MEDIUM	Vikunja 2.2.0 before 2.7.1 Token Scope Bypass via Project Webhook Endpoints
CVE-2026-123493	5.4 MEDIUM	Vikunja from 2.4.0 before 2.7.1 Authentication Bypass via Bot API Tokens
CVE-2026-123503	5.4 MEDIUM	Vikunja before 2.7.1 Improper Authorization in Kanban Bucket Deletion

Showing top 20 of 39 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: vikunja

Same vendor: go-vikunja

Same weakness: CWE-307