CVE-2021-39165 is a medium-severity (CVSS 6.5) SQL Injection vulnerability in cachethq/cachet. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. The records list no fixed version yet; check the vendor advisory below and apply the mitigations in the meantime.
Unauthenticated SQL Injection in Cachet
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
Where this sits among everything scored
Real-World Exposure
cachethq/cachetReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.
Description
Impact
In Cachet versions through 2.3.18, there is a SQL injection which is in the SearchableTrait#scopeSearch(). Attackers without authentication can utilize this vulnerability to exfiltrate sensitive data from the database such as administrator's password and session.
Patches
The original repository of https://github.com/CachetHQ/Cachet is not active, the stable version 2.3.18 and it's developing 2.4 branch is affected.
Update to version 2.5 or later in the https://github.com/fiveai/Cachet fork to fix this vulnerability.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | cachethq/cachet | all versions | No fix |
Affected Products
cachetchachethqResearch use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.
Detection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for cachethq/cachet, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Remediation status
The records we use list no patched version of cachethq/cachet for CVE-2021-39165. Check the maintainer's advisory, and where your build allows, override or pin the dependency away from the vulnerable range.
Mitigate without a patch
Until you can upgrade, make sure every query built from user input uses parameterised statements or a prepared-statement API rather than string concatenation, and reduce the database account's privileges so an injected query cannot read or alter data beyond what the feature needs.
How to detect CVE-2021-39165
A community-maintained Nuclei template exists for this CVE. You can scan for it directly:
nuclei -id cve-2021-39165 -u https://target- Template
- Cachet <=2.3.18 - SQL Injection
- Severity
- medium
- Impact
- Successful exploitation of this vulnerability could allow an attacker to execute arbitrary SQL queries, potentially leading to unauthorized access, data leakage, or data manipulation.
- Remediation
- Upgrade Cachet to a version higher than 2.3.18 or apply the necessary patches provided by the vendor.
Template by ProjectDiscovery nuclei-templates (tess), MIT licensed. View the full template. Scan only systems you are authorised to test.
Frequently Asked Questions
Is CVE-2021-39165 in your dependencies?
Find it across Packagist, including transitive dependencies.