GHSA-9436-3gmp-4f53 · Severity: high · Ecosystem: composer — grav Server-side Template Injection (SSTI) mitigation bypass
Grav is a file-based Web-platform built in PHP. Grav is subject to a server side template injection (SSTI) vulnerability. The fix for another SSTI vulnerability using `|map`, `|filter` and `|reduce` twigs implemented in the commit `71bbed1` introduces bypass of the denylist due to incorrect return value from `isDangerousFunction()`, which allows to execute the payload prepending double backslash (`\\`). The `isDangerousFunction()` check in version 1.7.42 and onwards retuns `false` value instead of `true` when the `\` symbol is found in the `$name`. This vulnerability can be exploited if the attacker has access to: 1. an Administrator account, or 2. a non-administrator, user account that has Admin panel access and Create/Update page permissions. A fix for this vulnerability has been introduced in commit `b4c6210` and is included in release version `1.7.42.2`. Users are advised to upgrade. There are no known workarounds for this vulnerability.
Conclusion & alert: CVE-2023-37897 is rated High Exploit Risk (74.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.26%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +2.16% over the last day, indicating growing attacker interest. Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 0.10% | 2.26% | +2.16% |
| 2 | 2025-11-21 | 0.60% | 0.10% | -0.50% |
| 3 | 2025-11-18 | — | 0.60% | — |
Full EPSS history (12 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 7.2 | 3.1 | HIGH |
|
1.2 | 5.9 | [email protected] |
| 8.8 | 3.1 | HIGH |
|
2.8 | 5.9 | [email protected] |
GHSA-9436-3gmp-4f53 · Severity: high · Ecosystem: composer — grav Server-side Template Injection (SSTI) mitigation bypass
| URL | Tags |
|---|---|
| https://github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b | Product |
| https://github.com/getgrav/grav/commit/b4c62101a43051fc7f5349c7d0a5b6085375c1d7 | Patch |
| https://github.com/getgrav/grav/security/advisories/GHSA-9436-3gmp-4f53 | Exploit Mitigation Vendor Advisory |