CVE-2021-40219
CVE-2021-40219 is a high-severity vulnerability in Bolt Bolt Cms with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-94.
Key facts
- Severity: High (CVSS 3.x base score 8.8)
- CVSS v2: 6.5
- EPSS exploit prediction: 3% (87th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-94
- Affected product: Bolt Bolt Cms
- Published:
- Last modified:
Description
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.
Frequently asked questions
- What is CVE-2021-40219?
- 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.
- How severe is CVE-2021-40219?
- CVE-2021-40219 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-40219 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-40219?
- CVE-2021-40219 affects Bolt Bolt Cms. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-40219?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
- When was CVE-2021-40219 published?
- CVE-2021-40219 was published on 2022-04-11 and last updated on 2026-07-05.
References
- https://github.com/bolt/core
- https://github.com/bolt/core/blob/3b21a73ebf519b76756d3ad2841312d10ef11461/src/Controller/Frontend/TemplateController.php
- https://github.com/iiSiLvEr/CVEs/tree/main/CVE-2021-40219
- http://boltcms.com
Affected products (1)
- cpe:2.3:a:bolt:bolt_cms:*:*:*:*:*:*:*:*
More vulnerabilities in Bolt Bolt Cms
- CVE-2022-36532 — High (CVSS 8.8): Bolt CMS contains a vulnerability in version 5.1.12 and below that allows an authenticated user with the ROLE_EDITOR…
- CVE-2018-19933 — Medium (CVSS 6.1): Bolt CMS <3.6.2 allows XSS via text input click preview button as demonstrated by the Title field of a Configured and…
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Other CWE-94 (Code Injection) vulnerabilities
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- CVE-2026-53576 — Critical (CVSS 10.0): Kestra is an open-source, event-driven orchestration platform. Prior to 1.0.45 and 1.3.21, the authentication filter…
- CVE-2026-10561 — Critical (CVSS 10.0): IBM Langflow OSS 1.0.0 through 1.9.3 has an vulnerability due to an improper isolation of Python execution combined…
- CVE-2026-25470 — Critical (CVSS 10.0): Improper Control of Generation of Code ('Code Injection') vulnerability in ACPT ACPT (Pro) - Custom Post Types Plugin…
- CVE-2026-48836 — Critical (CVSS 10.0): Unauthenticated Remote Code Execution (RCE) in Easy Invoice <= 2.1.19 versions.