CVE-2021-40219

HIGHNVD 8.88.8—

8.8

Bolt CMS <= 4.2 is vulnerable to Remote Code Execution. Unsafe theme rendering allows an authenticated attacker to edit theme to inject server-side template injection that leads to remote code execution.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 89.9%
KEV: Not listed

Published

April 11, 2022

Last Modified

November 21, 2024

References (8)

cve@mitrehttp://boltcms.com
cve@mitrehttps://github.com/bolt/core
cve@mitrehttps://github.com/bolt/core/blob/3b21a73ebf519b76756d3ad2841312d10ef11461/src/Controller/Frontend/TemplateController.php
cve@mitrehttps://github.com/iiSiLvEr/CVEs/tree/main/CVE-2021-40219
af854a3a-2127-422b-91ae-364da2661108http://boltcms.com
af854a3a-2127-422b-91ae-364da2661108https://github.com/bolt/core
af854a3a-2127-422b-91ae-364da2661108https://github.com/bolt/core/blob/3b21a73ebf519b76756d3ad2841312d10ef11461/src/Controller/Frontend/TemplateController.php
af854a3a-2127-422b-91ae-364da2661108https://github.com/iiSiLvEr/CVEs/tree/main/CVE-2021-40219

Patch Availability(1)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
composer	bolt/core	—	ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)

Packagist(1)

Package	Vulnerable range	Fixed in	Dependents
bolt/core	1.0.0-alpha1 ... 4.1.9 (116 versions)	—	—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-94Improper Control of Generation of Code (Code Injection)

Data Freshness Timeline

(refreshed 10× in last 7d / 10× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-27 13:39 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 07:17 UTCepss_batch
2026-05-26 00:13 UTCEG score recompute
2026-05-26 00:13 UTCGHSA enrichment
2026-05-24 05:57 UTCOSV refresh

Frequently asked(5)

What is CVE-2021-40219?

CVE-2021-40219 is a high vulnerability published on April 11, 2022. Bolt CMS <= 4.2 is vulnerable to Remote Code Execution. Unsafe theme rendering allows an authenticated attacker to edit theme to inject server-side template injection that leads to remote code execution.

When was CVE-2021-40219 disclosed?

CVE-2021-40219 was first published in the National Vulnerability Database on April 11, 2022, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-40219 actively exploited?

CVE-2021-40219 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 89.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-40219?

CVE-2021-40219 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2021-40219?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-40219, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-40219

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