CVE-2022-0323 is a medium-severity (CVSS 5.3) CWE-1336 vulnerability in mustache/mustache. 1 public exploit reference exists, so weaponization risk is real. A fix is available for mustache/mustache — see the affected versions and patch details below.
Improper Neutralization of Special Elements Used in a Template Engine in bobthecow/mustache.php
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
CVE-2022-0323 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
mustache/mustacheReal-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
In Mustache.php v2.0.0 through v2.14.0, Sections tag can lead to arbitrary php code execution even if strict_callables is true when section value is controllable.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| 🐘Packagist | mustache/mustache | ≥ 2.0.0&&< 2.14.1 | 2.14.1composer require mustache/mustache:^2.14.1 |
Affected Products
mustachemustache_projectResearch 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 mustache/mustache, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update mustache/mustache to 2.14.1 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2022-0323 is resolved across your whole dependency graph.
Workarounds
Stop passing untrusted input into the interpreter or shell: call the affected binary with an argument array rather than a composed command string, reject anything outside a strict allowlist of expected values, and run the component under an account that cannot reach beyond the work it legitimately does.
Frequently Asked Questions
Is CVE-2022-0323 in your dependencies?
Find it across Packagist, including transitive dependencies.