CVE-2023-49792
A public proof of concept exists; no exploitation attested.
- Published2023-12-22
- Fixed in27.1.4 · 26.0.9 · 25.0.13.4 · 24.0.12.9 · 23.0.12.13
- WeaknessCWE-307
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
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.
Timeline
dates in UTC- 2023-12-2217:15CVE publishedNVD
- 2026-10-2319:23First public proof of conceptPoC-in-GitHub
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-49792?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-49792?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 27.x | ≥ 27.0.0, < 27.1.4 | 27.1.4 | NVD |
| 26.0 | ≥ 26.0.0, < 26.0.9 | 26.0.9 | NVD |
| 25.0 | ≥ 25.0.0, < 25.0.13.4 | 25.0.13.4 | NVD |
| 24.0 | ≥ 24.0.0, < 24.0.12.9 | 24.0.12.9 | NVD |
| 23.0 | ≥ 23.0.0, < 23.0.12.13 | 23.0.12.13 | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- Update Nextcloud nextcloud server to 27.1.4 · 26.0.9 · 25.0.13.4 · 24.0.12.9 · 23.0.12.13
Advisories and patches
- github.comVendor Advisory
- github.comPatch
Detection
read 2026-10-23 19:23 UTC- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- 1 repository, unverifiedCStockdale1/nextcloud-cve-2023-49792-research PoC-in-GitHub
Sources
- CISA-ADPSSVC decisionnone2024-08-27
- OpenCVESSVC decisionnone—
- CNACVSS 3.15.3read 2026-10-23
- NVDCVSS 3.19.8read 2026-10-23
- CNAweakness (CWE)CWE-307read 2026-10-23
- FIRST EPSSEPSS score1.0 %2026-10-23
- PoC-in-GitHubproof of concept1read 2026-10-23
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- 2023-12-22
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2023-49792?
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Related vulnerabilities
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