CVE-2021-27915 | XSS Cross-site Scripting Stored (XSS) - Description field

Prior to the patched version, there is an XSS vulnerability in the description fields within the Mautic application which could be exploited by a logged in user of Mautic with the appropriate permissions. This could lead to the user having elevated access to the system.

Published: 2024-09-17 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-27915 is rated Moderate Risk (46/100): CVSS High severity, with low exploitation likelihood (EPSS 0.59%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-27915

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.19% 0.59% +0.40%
2 2026-02-06 0.14% 0.19% +0.05%
3 2025-11-21 — 0.14% —

Full EPSS history (8 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-27915

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.6 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 2.1 5.5 [email protected]
9.0 3.1 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.3 6.0 [email protected]

Weakness enumeration for CVE-2021-27915

GitHub Security Advisory for CVE-2021-27915

GHSA-2rc5-2755-v422 · Severity: high · Ecosystem: composer — Mautic vulnerable to stored cross-site scripting in description field

Affected software / configurations for CVE-2021-27915

Vendor Product Version Raw CPE
acquia mautic >= 1.0.0, < 4.4.12 cpe:2.3:a:acquia:mautic:*:*:*:*:*:*:*:*
acquia mautic 1.0.0 cpe:2.3:a:acquia:mautic:1.0.0:-:*:*:*:*:*:*
acquia mautic 1.0.0 cpe:2.3:a:acquia:mautic:1.0.0:beta2:*:*:*:*:*:*
acquia mautic 1.0.0 cpe:2.3:a:acquia:mautic:1.0.0:beta3:*:*:*:*:*:*
acquia mautic 1.0.0 cpe:2.3:a:acquia:mautic:1.0.0:beta4:*:*:*:*:*:*
acquia mautic 1.0.0 cpe:2.3:a:acquia:mautic:1.0.0:rc1:*:*:*:*:*:*
acquia mautic 1.0.0 cpe:2.3:a:acquia:mautic:1.0.0:rc2:*:*:*:*:*:*
acquia mautic 1.0.0 cpe:2.3:a:acquia:mautic:1.0.0:rc3:*:*:*:*:*:*
acquia mautic 1.0.0 cpe:2.3:a:acquia:mautic:1.0.0:rc4:*:*:*:*:*:*

References for CVE-2021-27915

cvelogic Threat Intelligence