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CVE-2021-27370

28
FAUCET Score

CVE-2021-27370 describes a stored Cross-Site Scripting (XSS) vulnerability in Monica 2.19.1, specifically within the Contact page via the Last Name field. This medium-severity vulnerability (CVSS 5.4) requires user interaction and low privileges to exploit, potentially leading to limited impact on confidentiality and integrity. While not actively exploited in the wild and lacking Metasploit/Nuclei modules, a public exploit is available on ExploitDB, though community discussion and media coverage remain minimal.

Impacted Technologies

VendorProductVersion(s)CPE
2.19.1CPE matchmatch criteria
cpe:2.3:a:monicahq:monica:2.19.1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.4MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.3
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.27%
Probability of exploitation in next 30 days
EPSS Percentile
87.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-49582 · Feb 23, 2021
This CVE's current EPSS score of 0.0327 is in the 99th percentile among its peer group of 15,239 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/161501/Monica-2.19.1-Cross-Site-Scripting.html
ExploitThird Party AdvisoryVDB Entry
github.com / monicahq/monica/issues/4888
ExploitIssue TrackingThird Party Advisory
github.com / monicahq/monica/pull/4543
ExploitThird Party Advisory
huntr.dev / bounties/2-other-monica
ExploitThird Party Advisory