Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Cloudreve versions below 4.0.0-20260613023150-7968e50429ef are affected by a path traversal flaw in the WOPI PUT_RELATIVE handler, which lets a file be created outside the directory of the file the WOPI token was issued for. An attacker holding a WOPI access token, such as a malicious or compromised integration or a leaked token, can create files elsewhere in the same user's account and, in some cases, overwrite them. Upgrade Cloudreve v4 to 4.0.0-20260613023150-7968e50429ef or later. The Cloudreve v3 module has no fixed version listed.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 4.3 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0038, the 32nd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:51 UTC First seen by agentprime
- 31 Oct 2026, 14:51 UTC Confirmed by OSV