CVE-2026-55502

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.2%, top 91% of all CVEs by exploit prediction. 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
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, POST /api/v4/admin/policy/oauth/signin requires only Admin.Read even though GetOauthRedirectService persists caller-supplied OneDrive secret and app_id values, allowing an OAuth token without Admin.Write to modify storage policy credentials. The route is inside the admin group that requires Admin.Read, but it does not add the local Admin.Write guard used by sibling policy mutation routes. Its handler persists attacker-supplied secret and app_id values into the selected OneDrive storage policy before returning an OAuth URL. This issue is fixed in version 4.17.0.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
48(Track)
EG Risk 48/100SSVC: Track

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
Severity71% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
9%
KEV
Not listed

Published

July 24, 2026

Last Modified

July 31, 2026

Advisory Details (1)

Auto-updated Jul 31, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

Cloudreve OAuth Admin.Read scope can update OneDrive storage policy credentials · Advisory · cloudreve/cloudreve · GitHub

https://github.com/cloudreve/cloudreve/security/advisories/GHSA-hq88-5x99-x3gf

Vendor Advisories for CVE-2026-55502(1)

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

Affected Packages

(2 across 1 ecosystem)
Go(2)
PackageVulnerable rangeFixed inDependents
github.com/cloudreve/Cloudreve/v3———
github.com/cloudreve/Cloudreve/v4—4.17.0—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 54× 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.

  1. 2026-08-26 19:52 UTCEG score recompute
  2. 2026-08-26 14:46 UTCEPSS rescore
  3. 2026-08-25 19:02 UTCEG score recompute
  4. 2026-08-25 13:49 UTCEPSS rescore
  5. 2026-08-24 18:05 UTCEG score recompute
  6. 2026-08-23 04:13 UTCEG score recompute
  7. 2026-08-23 00:19 UTCEPSS rescore
  8. 2026-08-22 03:31 UTCEG score recompute
  9. 2026-08-21 23:49 UTCEPSS rescore
  10. 2026-08-21 02:50 UTCEG score recompute
  11. 2026-08-20 22:55 UTCEPSS rescore
  12. 2026-08-20 00:35 UTCEG score recompute
  13. 2026-08-19 17:04 UTCEPSS rescore
  14. 2026-08-18 23:53 UTCEG score recompute
  15. 2026-08-18 13:48 UTCEPSS rescore
  16. 2026-08-17 23:11 UTCEG score recompute
  17. 2026-08-17 13:47 UTCEPSS rescore
  18. 2026-08-16 22:29 UTCEG score recompute
  19. 2026-08-16 14:56 UTCEPSS rescore
  20. 2026-08-16 10:09 UTCEG score recompute
  21. 2026-08-16 02:14 UTCEPSS rescore
  22. 2026-08-15 09:29 UTCEG score recompute
  23. 2026-08-15 01:30 UTCEPSS rescore
  24. 2026-08-14 08:48 UTCEG score recompute
  25. 2026-08-13 22:00 UTCEPSS rescore
Show 31 more
  1. 2026-08-12 19:47 UTCEG score recompute
  2. 2026-08-12 13:51 UTCEPSS rescore
  3. 2026-08-11 19:06 UTCEG score recompute
  4. 2026-08-11 06:39 UTCEG score recompute
  5. 2026-08-11 00:00 UTCEPSS rescore
  6. 2026-08-09 17:38 UTCEG score recompute
  7. 2026-08-09 13:46 UTCEPSS rescore
  8. 2026-08-08 16:58 UTCEG score recompute
  9. 2026-08-08 16:37 UTCEPSS rescore
  10. 2026-08-08 04:37 UTCEG score recompute
  11. 2026-08-06 15:37 UTCEG score recompute
  12. 2026-08-06 13:47 UTCEPSS rescore
  13. 2026-08-06 03:16 UTCEG score recompute
  14. 2026-08-05 19:17 UTCEPSS rescore
  15. 2026-08-05 02:36 UTCEG score recompute
  16. 2026-08-04 15:10 UTCEPSS rescore
  17. 2026-08-04 14:15 UTCEG score recompute
  18. 2026-08-04 10:39 UTCEPSS rescore
  19. 2026-08-03 13:30 UTCEG score recompute
  20. 2026-08-03 10:36 UTCEPSS rescore
  21. 2026-08-02 12:49 UTCEG score recompute
  22. 2026-08-02 02:27 UTCEPSS rescore
  23. 2026-08-01 12:09 UTCEG score recompute
  24. 2026-08-01 04:16 UTCEPSS rescore
  25. 2026-07-31 23:47 UTCEG score recompute
  26. 2026-07-31 11:26 UTCEG score recompute
  27. 2026-07-31 11:15 UTCEG score recompute
  28. 2026-07-31 04:20 UTCEG score recompute
  29. 2026-07-30 12:40 UTCEG score recompute
  30. 2026-07-26 22:05 UTCEG score recompute
  31. 2026-07-24 21:12 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-55502?
CVE-2026-55502 is a high vulnerability published on July 24, 2026. Cloudreve is a self-hosted file management and sharing system. Prior to 4.17.0, POST /api/v4/admin/policy/oauth/signin requires only Admin.Read even though GetOauthRedirectService persists caller-supplied OneDrive secret and appid values, allowing an OAuth token without Admin.Write to modify…
When was CVE-2026-55502 disclosed?
CVE-2026-55502 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on July 31, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55502 actively exploited?
CVE-2026-55502 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 90.8% of all scored CVEs.
What is the CVSS score of CVE-2026-55502?
CVE-2026-55502 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-55502?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55502, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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