CVE-2021-36440 json
Unrestricted File Upload in ShowDoc v2.9.5
published 2021-09-08 5 y ago modified 2026-06-17 4 mo ago also GHSA-c442-3278-rhrg , EUVD-2021-2032
- cvss
- 9.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 4.8%
- EPSS 4.8% chance of exploitation in 30 days, percentile 91%
- public exploits
- 0
- none known
Summary
Unrestricted File Upload in ShowDoc v2.9.5 allows remote attackers to execute arbitrary code via the 'file_url' parameter in the component AdminUpdateController.class.php'.
Patch / fix
Exploit prediction
4.76% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/star7th/showdoc/issues/1406 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | showdoc/showdoc | <2.9.6 |
2.9.6 |
Classification
- Weakness
-
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
-
github.com
/star7th/showdoc/commit/49b992d4c548c8c615a92b6efe8a50c8f1083abf
web
-
github.com
/star7th/showdoc/issues/1406
web, exploit, issue-tracking, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2021-36440
advisory
-
github.com
/star7th/showdoc
package
Sources
- CVE List CVE-2021-36440
- GitHub Advisory GHSA-c442-3278-rhrg
- NVD CVE-2021-36440
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.