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Fencer Vulns
medium 5.8

CVE-2021-27908 json

Mautic vulnerable to secret data exfiltration via symfony parameters

published 2021-03-23 5 y ago modified 2026-07-08 4 mo ago also GHSA-4hjq-422q-4vpx , EUVD-2021-0756

cvss
5.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 28%
public exploits
0
none known

Summary

In all versions prior to Mautic 3.3.2, secret parameters such as database credentials could be exposed publicly by an authorized admin user through leveraging Symfony parameter syntax in any of the free text fields in Mautic’s configuration that are used in publicly facing parts of the application.

Patch / fix

  • packagist mautic/core 3.3.2
  • Mautic Mautic 3.3.2

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/mautic/mautic/security/advisories/GHSA-4hjq-422q-4vpx referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 5.8 CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L
NVD 3.1 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N
GitHub 3.1 5.8 CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:U/C:H/I:H/A:L

Affected packages

ecosystem package affected fixed in
packagist mautic/core
<3.3.2
3.3.2

Affected products

  • Mautic Mautic

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component
  • CWE-732 Incorrect Permission Assignment for Critical Resource

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.