CVE-2026-55499

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 4.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.3% (23rd percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, secondary
Elevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 4.3Exploit: Elevated riskExposed services: Not assessed

A fix is available — apply it.

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.

CVSS v3
4.3
EG Score
4.3MEDIUMmedium confidence
EG Risk
35
EG Risk 35/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
24th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

July 24, 2026

Last Modified

September 8, 2026

Advisory Details (3)

Auto-updated Jul 31, 2026
Patch available. Sources: github_commit, github_release, github.
githubMentions a patch (unverified)

Broken Access Control in file event stream: a single-file share recipient is subscribed to the owner's parent folder and receives activity events for unshared siblings · Advisory · cloudreve/cloudreve · GitHub

https://github.com/cloudreve/cloudreve/security/advisories/GHSA-w8x7-h2px-xmq8
github_release Patch Available

4.17.0

Patch available: cloudreve/cloudreve 4.17.0

https://github.com/cloudreve/cloudreve/releases/tag/4.17.0
github_commit

commit 0b00dd308f13 (cloudreve/cloudreve)

Fix landed in cloudreve/cloudreve commit 0b00dd308f13 — awaiting tagged release

https://github.com/cloudreve/cloudreve/commit/0b00dd308f132d6e6e8476857ef79f4865600bbc

Vendor Advisories for CVE-2026-55499(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 1 ecosystem)
Go(3)
PackageVulnerable rangeFix by version rangeDependents
github.com/cloudreve/Cloudreve—
  • every version on: no fix on record
—
github.com/cloudreve/Cloudreve/v3—
  • every version through 3.0.0-20250225100611-da4e44b77af4: no fix on record
  • every version on: no fix on record
—
github.com/cloudreve/Cloudreve/v4—
  • every version up to 4.0.0-20260613030215-0b00dd308f13: fixed in 4.0.0-20260613030215-0b00dd308f13
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 8× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-10-10 20:00 UTCEPSS rescore
  2. 2026-10-09 20:07 UTCEPSS rescore
  3. 2026-10-08 17:12 UTCEPSS rescore
  4. 2026-10-07 23:48 UTCEPSS rescore
  5. 2026-10-06 15:18 UTCEPSS rescore
  6. 2026-10-05 17:43 UTCEPSS rescore
  7. 2026-10-04 23:22 UTCEPSS rescore
  8. 2026-10-04 07:42 UTCEG score recompute
  9. 2026-10-03 14:26 UTCEPSS rescore
  10. 2026-10-02 19:44 UTCEG score recompute
  11. 2026-10-02 17:56 UTCEPSS rescore
  12. 2026-10-01 19:50 UTCEPSS rescore
  13. 2026-10-01 05:58 UTCEG score recompute
  14. 2026-09-30 15:03 UTCEPSS rescore
  15. 2026-09-29 15:22 UTCEPSS rescore
  16. 2026-09-28 13:51 UTCEPSS rescore
  17. 2026-09-28 04:26 UTCEG score recompute
  18. 2026-09-27 13:48 UTCEPSS rescore
  19. 2026-09-26 15:59 UTCEPSS rescore
  20. 2026-09-25 10:01 UTCEG score recompute
  21. 2026-09-24 14:04 UTCEPSS rescore
  22. 2026-09-23 22:17 UTCEG score recompute
  23. 2026-09-23 17:54 UTCEPSS rescore
  24. 2026-09-22 22:09 UTCEG score recompute
  25. 2026-09-20 20:16 UTCEPSS rescore
Show 75 more
  1. 2026-09-20 01:39 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 08:07 UTCEG score recompute
  4. 2026-09-17 19:31 UTCEPSS rescore
  5. 2026-09-17 10:03 UTCEG score recompute
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 11:58 UTCEG score recompute
  8. 2026-09-16 05:15 UTCEPSS rescore
  9. 2026-09-15 09:35 UTCEG score recompute
  10. 2026-09-15 03:11 UTCEPSS rescore
  11. 2026-09-14 10:50 UTCEG score recompute
  12. 2026-09-13 16:47 UTCEPSS rescore
  13. 2026-09-13 12:44 UTCEG score recompute
  14. 2026-09-11 16:36 UTCEG score recompute
  15. 2026-09-11 14:53 UTCEPSS rescore
  16. 2026-09-10 13:34 UTCEG score recompute
  17. 2026-09-10 09:35 UTCEPSS rescore
  18. 2026-09-08 22:01 UTCEPSS rescore
  19. 2026-09-07 21:23 UTCEG score recompute
  20. 2026-09-07 16:01 UTCEPSS rescore
  21. 2026-09-06 17:27 UTCEG score recompute
  22. 2026-09-06 13:47 UTCEPSS rescore
  23. 2026-09-05 19:22 UTCEG score recompute
  24. 2026-09-04 12:48 UTCEG score recompute
  25. 2026-09-04 05:06 UTCEPSS rescore
  26. 2026-09-02 14:12 UTCEPSS rescore
  27. 2026-09-01 23:15 UTCEG score recompute
  28. 2026-09-01 13:54 UTCEPSS rescore
  29. 2026-09-01 04:40 UTCEPSS rescore
  30. 2026-08-30 22:19 UTCEG score recompute
  31. 2026-08-30 19:17 UTCEPSS rescore
  32. 2026-08-30 01:22 UTCEPSS rescore
  33. 2026-08-30 00:15 UTCEG score recompute
  34. 2026-08-28 21:41 UTCEPSS rescore
  35. 2026-08-26 19:52 UTCEG score recompute
  36. 2026-08-26 14:46 UTCEPSS rescore
  37. 2026-08-24 22:19 UTCEG score recompute
  38. 2026-08-23 02:11 UTCEG score recompute
  39. 2026-08-23 00:19 UTCEPSS rescore
  40. 2026-08-22 04:06 UTCEG score recompute
  41. 2026-08-21 23:49 UTCEPSS rescore
  42. 2026-08-21 06:02 UTCEG score recompute
  43. 2026-08-20 22:55 UTCEPSS rescore
  44. 2026-08-20 07:57 UTCEG score recompute
  45. 2026-08-19 17:04 UTCEPSS rescore
  46. 2026-08-19 09:53 UTCEG score recompute
  47. 2026-08-18 13:48 UTCEPSS rescore
  48. 2026-08-18 11:49 UTCEG score recompute
  49. 2026-08-17 13:47 UTCEPSS rescore
  50. 2026-08-16 15:41 UTCEG score recompute
  51. 2026-08-16 14:56 UTCEPSS rescore
  52. 2026-08-16 02:14 UTCEPSS rescore
  53. 2026-08-15 17:37 UTCEG score recompute
  54. 2026-08-15 01:30 UTCEPSS rescore
  55. 2026-08-14 19:32 UTCEG score recompute
  56. 2026-08-13 22:00 UTCEPSS rescore
  57. 2026-08-12 23:25 UTCEG score recompute
  58. 2026-08-12 13:51 UTCEPSS rescore
  59. 2026-08-12 01:21 UTCEG score recompute
  60. 2026-08-11 03:17 UTCEG score recompute
  61. 2026-08-11 00:00 UTCEPSS rescore
  62. 2026-08-10 05:14 UTCEG score recompute
  63. 2026-08-09 13:46 UTCEPSS rescore
  64. 2026-08-09 07:10 UTCEG score recompute
  65. 2026-08-08 16:37 UTCEPSS rescore
  66. 2026-08-08 09:06 UTCEG score recompute
  67. 2026-08-07 11:03 UTCEG score recompute
  68. 2026-08-06 13:47 UTCEPSS rescore
  69. 2026-08-06 12:58 UTCEG score recompute
  70. 2026-08-05 19:17 UTCEPSS rescore
  71. 2026-08-04 16:50 UTCEG score recompute
  72. 2026-08-04 15:10 UTCEPSS rescore
  73. 2026-08-04 10:39 UTCEPSS rescore
  74. 2026-08-02 20:42 UTCEG score recompute
  75. 2026-08-02 02:27 UTCEPSS rescore

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-55499?
CVE-2026-55499 is a medium vulnerability published on July 24, 2026. 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,…
When was CVE-2026-55499 disclosed?
CVE-2026-55499 was first published on July 24, 2026, with the most recent update on September 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55499 actively exploited?
CVE-2026-55499 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (24th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55499?
CVE-2026-55499 has a CVSS base score of 4.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55499?
A fix for CVE-2026-55499 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55499 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-55499

Explore →

Is Your Infrastructure Affected by CVE-2026-55499?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs