Skip to content
Fencer Vulns
medium 4.3

CVE-2026-55499 json

Cloudreve: Broken access control in file event stream leaks activity events for unshared siblings to single-file share recipients

published 2026-07-24 3 mo ago modified 2026-09-08 2 mo ago also EUVD-2026-51393 , GHSA-w8x7-h2px-xmq8 , GO-2026-6102

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 26%
public exploits
0
none known

Summary

Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, a single-file share event-stream subscription resolves the share root to the owner’s parent folder and subscribes to that folder topic, allowing an authenticated share recipient to receive names, paths, rename targets, event types, and hashed identifiers for unshared sibling files and folders. This issue is fixed in version 4.17.0.

Patch / fix

  • go github.com/cloudreve/Cloudreve/v4 4.0.0-20260613030215-0b00dd308f13
  • cloudreve cloudreve 4.17.0
  • govulncheck-vulndb SLES for SAP applications 16.0, SLES 16.0 0.0.20260827T195228-160000.1.1

suse advisories SUSE-SU-2026:23625-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260827T195228-160000.1.1

opensuse advisories openSUSE-SU-2026:21761-1

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/cloudreve/cloudreve/security/advisories/GHSA-w8x7-h2px-xmq8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
GitHub 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem package affected fixed in
go github.com/cloudreve/Cloudreve/v4
<4.0.0-20260613030215-0b00dd308f13
4.0.0-20260613030215-0b00dd308f13
go github.com/cloudreve/Cloudreve/v3
<=3.0.0-20250225100611-da4e44b77af4
all versions
 no fix listed
go github.com/cloudreve/Cloudreve
all versions
 no fix listed

Affected products

  • cloudreve cloudreve

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.