CVE-2020-26138 json
FormField with square brackets in field name skips validation
published 2021-06-08 5 y ago modified 2026-06-17 4 mo ago also BIT-silverstripe-2020-26138 , EUVD-2022-1362 , GHSA-7mv4-4xpg-xq44
- cvss
- 5.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.3%
- EPSS 1.3% chance of exploitation in 30 days, percentile 71%
- public exploits
- 0
- none known
Summary
In SilverStripe through 4.6.0-rc1, a FormField with square brackets in the field name skips validation.
Patch / fix
- packagist silverstripe/framework 4.7.4
- bitnami silverstripe 4.6.0
- silverstripe silverstripe 4.6.0
Exploit prediction
1.34% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- silverstripe.org https://www.silverstripe.org/download/security-releases/cve-2020-26138 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| GitHub | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:N/I:P/A:N |
| OSV | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | silverstripe/framework | >=3.0.0, <4.7.4 |
4.7.4 |
| bitnami | silverstripe | <4.6.0 >=4.6.0-rc1, <=4.6.0-rc1 |
4.6.0 |
Classification
- Weakness
-
- CWE-20 Improper Input Validation
References
-
silverstripe.org
/download/security-releases/cve-2020-26138
web, exploit, vendor-advisory
-
silverstripe.org
/download/security-releases/
vendor-advisory, web
-
silverstripe.org
/blog/tag/release
release-notes, vendor-advisory, web
-
forum.silverstripe.org
/c/releases
release-notes, vendor-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2020-26138
advisory
-
github.com
/FriendsOfPHP/security-advisories/blob/master/silverstripe/framework/CVE-2020-26138.yaml
web
Sources
- CVE List CVE-2020-26138
- GitHub Advisory GHSA-7mv4-4xpg-xq44
- NVD CVE-2020-26138
- OSV BIT-silverstripe-2020-26138
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.