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CVE-2021-40219

31
FAUCET Score

CVE-2021-40219 is a Remote Code Execution vulnerability affecting Bolt CMS versions 4.2 and earlier. An authenticated attacker can exploit unsafe theme rendering to inject server-side template code, leading to RCE. With a CVSS score of 8.8 (High), this vulnerability has a low attack complexity and allows for full compromise of confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.0CPE matchmatch criteria
cpe:2.3:a:bolt:bolt_cms:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.19%
Probability of exploitation in next 30 days
EPSS Percentile
86.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0319 is in the 86th percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

composerGHSA-gprh-7767-cw39high

Code Injection in Bolt CMS

Apr 12, 2022

References

github.com / bolt/core
Third Party Advisory
github.com / bolt/core/blob/3b21a73ebf519b76756d3ad2841312d10ef11461/src/Controller/Frontend/TemplateController.php
ExploitThird Party Advisory
github.com / iiSiLvEr/CVEs/tree/main/CVE-2021-40219
ExploitThird Party Advisory