CVE-2026-55499: 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 a

mediumCVSS 4.3CVE-2026-55499

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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 4.3
Published: 2026-07-31
Last updated: 2026-08-01
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-55499

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-554990.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-55499	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

mediumGHSA-w8x7-h2px-xmq8: Cloudreve: Broken Access Control in file event stream: a single-file share recipient is s…ghsa

Recent advisories for Cloudreve is a

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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mediumCVE-2026-55497: Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, the built-in t…nvd · 2026-07-31
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mediumCVE-2026-55495: Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, the WOPI PUT_R…nvd · 2026-07-31
mediumGHSA-v6w6-358x-2433: Cloudreve Admin.Read OAuth tokens can trigger server-side node test requestsghsa · 2026-07-24