CVE-2025-54880Public exploitNetwork attack vector

Cross-site scripting via unsanitized architecture icon text

Published Aug 19, 2025 · Updated Aug 19, 2025

Cross-site scripting in Mermaid 11.1.0 through 11.9.0 allows attackers to execute script through crafted architecture icon text. The architecture renderer passes service iconText directly to d3 html(), which assigns the value to innerHTML without sanitization. A site must render an attacker-supplied architecture diagram without additional sanitization, and a victim must view the result in a browser.

CVSS severity5.1
Medium
EPSS probability0.37%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Mermaid 11.1.0 through 11.9.0 allows attackers to execute script through crafted architecture icon text. The architecture renderer passes service iconText directly to d3 html(), which assigns the value to innerHTML without sanitization. A site must render an attacker-supplied architecture diagram without additional sanitization, and a victim must view the result in a browser.

The record

CVE
CVE-2025-54880
Published
Aug 19, 2025
Updated
Aug 19, 2025
Vendor
Mermaid
Product
Mermaid
Classifications
CWE-79, T1203
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 19, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 19, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 11.1.0, < 11.10.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

Mermaid · Mermaidversion=>= 11.1.0, < 11.10.0

Published CVSS scores

6.1NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.1GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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