Advisory details:
github_osv / GHSA-g8wr-r2v2-vqc6
| Advisory ID | github_osv/GHSA-g8wr-r2v2-vqc6 |
| Aliases |
CVE-2026-54721
|
| Summary | silverstripe/userforms vulnerable to remote code execution via userforms email subject ### Impact The userform email subject field in the CMS is vulnerable to a specially crafted payload being used to run arbitrary code on the server. ### Reported by Jack Wallace from Bastion Security |
| Status | Published |
| Exploitability | 0.5 |
| Weighted Severity | 7.9 |
| Risk | 4.0 |
| Affected and Fixed Packages | Package Details |
| Introduced and Fixed Package Commit Patches | Package Commit Patches Details |
| System | Score | Found at |
|---|---|---|
| cvssv3.1 | 8.8 | https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-g8wr-r2v2-vqc6/GHSA-g8wr-r2v2-vqc6.json |
| generic_textual | HIGH |
No EPSS data available for this advisory.
| Patch URL | |
|---|---|
| There are no known patches. | |
| Attack Vector (AV) | Attack Complexity (AC) | Privileges Required (PR) | User Interaction (UI) | Scope (S) | Confidentiality Impact (C) | Integrity Impact (I) | Availability Impact (A) |
|---|---|---|---|---|---|---|---|
network adjacent_network local physical |
low high |
none low high |
none required |
unchanged changed |
high low none |
high low none |
high low none |
Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-08-28T15:45:52Z/
Decision: Track
Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/54xxx/CVE-2026-54721.json
Source Advisory: vulnrichment/CVE-2026-54721
[{'Exploitation': 'none'},
{'Automatable': 'no'},
{'Technical Impact': 'total'},
{'Mission Prevalence': 'minimal'},
{'Public Well-being Impact': 'material'},
{'Mission & Well-being': 'medium'}]