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Fencer Vulns
high 8.8

CVE-2021-40219 json

Code Injection in Bolt CMS

published 2022-04-11 4 y ago modified 2026-07-09 4 mo ago also GHSA-gprh-7767-cw39 , EUVD-2022-1744

cvss
8.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

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.

Exploit prediction

3.43% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/bolt/core/blob/3b21a73ebf519b76756d3ad2841312d10ef11461/src/Controller/Frontend/TemplateController.php referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/iiSiLvEr/CVEs/tree/main/CVE-2021-40219 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 6.5 AV:N/AC:L/Au:S/C:P/I:P/A:P
GitHub 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
packagist bolt/core
<=4.2
 no fix listed

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.