CVE-2026-54066
Exploitation confirmed. First attested on 2026-08-03 by GCVE · kevintel, GCVE · shadowserver.
- Published2026-06-24
- Fixed in0.0.0-20260628153353-2d5d72223df4
- WeaknessCWE-1188 · CWE-22 · CWE-23
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
SiYuan is an open-source personal knowledge management system. Prior to 3.7.0, the patch for CVE-2026-41894 ("Path Traversal via Double URL Encoding") sanitized the /export/ route but the identical root cause remains in the /assets/*path route. In publish mode (anonymous read-only HTTP endpoint, default port 6808), an unauthenticated remote attacker can read arbitrary files inside WorkspaceDir — including conf/conf.json (which contains the AccessAuthCode SHA256 hash, API token, and sync keys), temp/siyuan.db, temp/blocktree.db, and siyuan.log — by double-URL-encoding .. segments. This vulnerability is fixed in 3.7.0.
Timeline
dates in UTC- 2026-06-2422:16CVE publishedNVD
- 2026-08-03Listed as exploited by GCVEGCVE
- 2026-08-03Exploitation first reportedGCVE
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-54066?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-54066?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
OSV| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 0.0 | < 0.0.0-20260628153353-2d5d72223df4 | 0.0.0-20260628153353-2d5d72223df4 | OSV |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update siyuan-note/siyuan/kernel to 0.0.0-20260628153353-2d5d72223df4
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
- Published
- 2026-06-24
- Last Modified
- 2026-06-25
- NVD status
- Deferred
Frequently asked questions
What is CVE-2026-54066?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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