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CVE-2021-35513

21
FAUCET Score

CVE-2021-35513 is a medium-severity cross-site scripting (XSS) vulnerability affecting Mermaid versions prior to 8.11.0 when the antiscript feature is enabled. An unauthenticated attacker could exploit this with low attack complexity via a network vector, requiring user interaction, to achieve partial confidentiality and integrity impacts. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 8.11.0CPE matchmatch criteria
cpe:2.3:a:mermaid_project:mermaid:*:*:*:*:*:node.js:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.02%
Probability of exploitation in next 30 days
EPSS Percentile
59.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0102 is in the 72nd percentile among its peer group of 26,221 CVEs.

Social Chatter

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

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: mermaidFixed in: 8.11.0

Vendor Advisories (1)

npmGHSA-4f6x-49g2-99fmmedium

Cross-site Scripting in Mermaid

Dec 10, 2021

References

github.com / mermaid-js/mermaid/issues/2122
Third Party Advisory
github.com / mermaid-js/mermaid/pull/2123
PatchThird Party Advisory
github.com / mermaid-js/mermaid/releases/tag/8.11.0-rc2
Release NotesThird Party Advisory