Administrator file deletion via unvalidated deckID
Published Sep 9, 2026 · Updated Sep 9, 2026
Path traversal in SiYuan before 3.8.2 allows remote authenticated users with administrator access to delete .deck and .cards files. The removeRiffDeck handler passes an unvalidated deckID to model.RemoveDeck, which appends file extensions and calls filelock.Remove on paths produced by filepath.Join. An administrator token and read-write mode are required; exploitation deletes matching files outside the workspace but does not disclose their contents.
Summary
What happened
Path traversal in SiYuan before 3.8.2 allows remote authenticated users with administrator access to delete .deck and .cards files. The removeRiffDeck handler passes an unvalidated deckID to model.RemoveDeck, which appends file extensions and calls filelock.Remove on paths produced by filepath.Join. An administrator token and read-write mode are required; exploitation deletes matching files outside the workspace but does not disclose their contents.
The record
- CVE
- CVE-2026-87815
- Published
- Sep 9, 2026
- Updated
- Sep 9, 2026
- Vendor
- SiYuan Note
- Product
- SiYuan
- Classifications
- CWE-73, CWE-22, T1485
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Sep 9, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <3.8.2
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Upstream removeRiffDeck HTTP proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo