CVE-2019-12739 json
lib/Controller/ExtractionController.php in the Extract add-on before 1.2.0 for Nextcloud allows Remote Code Execution via shell metacharact…
published 2019-06-05 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-4328
- cvss
- 9.0
- version 3.0, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.5%
- EPSS 2.5% chance of exploitation in 30 days, percentile 84%
- public exploits
- 0
- none known
Summary
lib/Controller/ExtractionController.php in the Extract add-on before 1.2.0 for Nextcloud allows Remote Code Execution via shell metacharacters in a RAR filename via ajax/extractRar.php (nameOfFile and directory parameters).
Patch / fix
- nextcloud extract 1.2.0
Exploit prediction
2.51% chance of exploitation in the next 30 days, higher than 84% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- hackerone.com https://hackerone.com/reports/546753 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.0 | 9.0 | CVSS:3.0/AC:L/AV:N/A:H/C:H/I:H/PR:L/S:C/UI:R |
| CNA | 3.0 | 9.0 | CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H |
| NVD | 3.0 | 8.8 | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 6.5 | AV:N/AC:L/Au:S/C:P/I:P/A:P |
Classification
- Weakness
-
- CWE-78 Improper Neutralization of Special Elements used in an OS Command
References
-
hackerone.com
/reports/546753
exploit, third-party-advisory
- secsignal.org /news/a-tale-of-rce-nextcloud-extract-app/
Sources
- CVE List CVE-2019-12739
- NVD CVE-2019-12739
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.