CVE-2023-49792

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.0%, top 40% 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, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

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

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server prior to versions 26.0.9 and 27.1.4; as well as Nextcloud Enterprise Server prior to versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4; when a (reverse) proxy is configured as trusted proxy the server could be tricked into reading a wrong remote address for an attacker, allowing them executing authentication attempts than intended. Nextcloud Server versions 26.0.9 and 27.1.4 and Nextcloud Enterprise Server versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4 contain a patch for this issue. No known workarounds are available.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
60(Track)
EG Risk 60/100SSVC: 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
Severity98% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
60.4%
KEV
Not listed

Published

December 22, 2023

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Jul 5, 2026
Patch available. Sources: github, github_pr.
generic

HackerOne

https://hackerone.com/reports/2230915
github_pr Patch Available

Reverse X-Forwarded-For list to read the correct proxy remote address

Patch available: nextcloud/server v33.0.3rc2 (PR #41526 merged 2023-11-16)

https://github.com/nextcloud/server/pull/41526
github Patch Available

Bruteforce protection can be bypassed with misconfigured proxy · Advisory · nextcloud/security-advisories · GitHub

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-5j2p-q736-hw98

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 51× 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 105 total refreshes for this CVE.

  1. 2026-07-23 14:16 UTCEPSS rescore
  2. 2026-07-23 02:28 UTCEG score recompute
  3. 2026-07-22 23:15 UTCEG score recompute▲ 4.50
  4. 2026-07-22 14:06 UTCEPSS rescore
  5. 2026-07-21 15:23 UTCEPSS rescore
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  7. 2026-07-20 17:06 UTCEPSS rescore
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  13. 2026-07-16 17:01 UTCEPSS rescore
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  16. 2026-07-15 01:59 UTCEPSS rescore
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  18. 2026-07-15 00:10 UTCOSV refresh
  19. 2026-07-13 22:28 UTCEPSS rescore
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  24. 2026-07-11 08:26 UTCEPSS rescore
  25. 2026-07-09 19:08 UTCEPSS rescore
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  1. 2026-07-08 15:13 UTCEPSS rescore
  2. 2026-07-07 13:44 UTCEPSS rescore
  3. 2026-07-07 13:44 UTCEPSS rescore
  4. 2026-07-06 16:26 UTCEPSS rescore
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  6. 2026-07-06 02:22 UTCEPSS rescore
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  10. 2026-07-02 16:59 UTCEPSS rescore
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  12. 2026-06-30 23:21 UTCEPSS rescore
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  17. 2026-06-28 04:55 UTCEPSS rescore
  18. 2026-06-27 03:07 UTCEPSS rescore
  19. 2026-06-27 01:07 UTCOSV refresh
  20. 2026-06-25 13:48 UTCEPSS rescore
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  22. 2026-06-24 14:04 UTCEPSS rescore
  23. 2026-06-24 14:04 UTCEPSS rescore
  24. 2026-06-24 06:35 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  25. 2026-06-23 21:31 UTCEPSS rescore
  26. 2026-06-23 21:31 UTCEPSS rescore
  27. 2026-06-22 14:24 UTCEPSS rescore
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  29. 2026-06-21 14:55 UTCEPSS rescore
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  31. 2026-06-21 01:58 UTCEPSS rescore
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  35. 2026-06-18 17:51 UTCEPSS rescore
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  39. 2026-06-15 17:47 UTCEPSS rescore
  40. 2026-06-14 23:16 UTCEPSS rescore
  41. 2026-06-13 22:59 UTCEPSS rescore
  42. 2026-06-13 22:59 UTCEPSS rescore
  43. 2026-06-12 23:11 UTCEPSS rescore
  44. 2026-06-12 23:10 UTCEPSS rescore
  45. 2026-06-11 13:59 UTCEPSS rescore
  46. 2026-06-10 22:17 UTCEPSS rescore
  47. 2026-06-10 13:21 UTCEPSS rescore
  48. 2026-06-09 11:28 UTCOSV refresh
  49. 2026-06-08 14:16 UTCEPSS rescore
  50. 2026-06-08 14:16 UTCEPSS rescore
  51. 2026-06-07 15:24 UTCEPSS rescore
  52. 2026-06-07 15:23 UTCEPSS rescore
  53. 2026-06-06 13:46 UTCEPSS rescore
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  63. 2026-06-02 20:12 UTCEPSS rescore
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  65. 2026-06-01 13:51 UTCEPSS rescore
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  67. 2026-05-31 22:30 UTCEPSS rescore
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  71. 2026-05-29 13:43 UTCEPSS rescore
  72. 2026-05-28 13:44 UTCEPSS rescore
  73. 2026-05-27 13:39 UTCEPSS rescore
  74. 2026-05-27 13:39 UTCEPSS rescore
  75. 2026-05-26 13:43 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2023-49792?
CVE-2023-49792 is a critical vulnerability published on December 22, 2023. Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. In Nextcloud Server prior to versions 26.0.9 and 27.1.4; as well as Nextcloud Enterprise Server prior to versions 23.0.12.13, 24.0.12.9, 25.0.13.4, 26.0.9, and 27.1.4; when a (reverse) proxy is configured as…
When was CVE-2023-49792 disclosed?
CVE-2023-49792 was first published in the National Vulnerability Database on December 22, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-49792 actively exploited?
CVE-2023-49792 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 60.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-49792?
CVE-2023-49792 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-49792?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-49792, 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.

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