SiYuan 2.1.0 before 3.8.9 contains a flaw where the loginAuth CAPTCHA challenge lives in a signed client-side cookie, allowing reuse of a solved challenge. Attackers can replay the original signed siyuan cookie with distinct wrong access codes to brute-force the code and gain an administrator session.
Advisories
No advisories yet.
Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
Fri, 13 Nov 2026 09:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | SiYuan 2.1.0 before 3.8.9 contains a flaw where the loginAuth CAPTCHA challenge lives in a signed client-side cookie, allowing reuse of a solved challenge. Attackers can replay the original signed siyuan cookie with distinct wrong access codes to brute-force the code and gain an administrator session. | |
| Title | SiYuan 2.1.0 before 3.8.9 CAPTCHA Bypass via Stale Login Cookie | |
| First Time appeared |
B3log
B3log siyuan |
|
| Weaknesses | CWE-307 | |
| CPEs | cpe:2.3:a:b3log:siyuan:*:*:*:*:*:*:*:* | |
| Vendors & Products |
B3log
B3log siyuan |
|
| References |
| |
| Metrics |
cvssV3_1
|
Projects
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Status: PUBLISHED
Assigner: VulnCheck
Published:
Updated: 2026-11-13T09:36:50.432Z
Reserved: 2026-11-10T20:13:22.556Z
Link: CVE-2026-126265
No data.
Status : Deferred
Published: 2026-11-13T10:17:29.003
Modified: 2026-11-13T10:17:29.133
Link: CVE-2026-126265
No data.
OpenCVE Enrichment
No data.
Weaknesses