CVE-2026-41148

MEDIUMPre-NVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.3%, top 74% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:github_m, epss
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Versions 10.9.5 and prior, in addition to 11.0.0-alpha.1 through 11.12.0 are vulnerable to CSS injection through improper sanitization. The state diagram (and any other diagram type that routes user-controlled style strings through the createCssStyles parser) captures classDef values using an unrestricted regex that matches everything up to a newline. That value then flows unsanitized through addStyleClass() into createCssStyles() and is assigned to style.innerHTML, so a closing brace (}) in the value terminates the generated CSS selector and turns everything after it into a new CSS rule on the page. This enables page defacement, user tracking via url() callbacks, and DOM attribute exfiltration. This issue has been fixed in versions 10.9.6 and 11.15.0. If developers are unable to immediately upgrade, they can work around this issue by setting "securityLevel": "sandbox", which prevents the issue by rendering the mermaid diagram in a sandboxed .

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
25.9%
KEV
Not listed

Published

May 22, 2026

Last Modified

May 27, 2026

Advisory Details (6)

Auto-updated Jun 15, 2026
🔬 Proof of concept available. Patch available. Sources: github, github_commit, github_release.
generic

Mermaid Config Schema | Mermaid

https://mermaid.js.org/config/schema-docs/config.html#securitylevel
github_release Patch Available

v10.9.6

Patch available: mermaid-js/mermaid v10.9.6

https://github.com/mermaid-js/mermaid/releases/tag/v10.9.6
github_release Patch Available

[email protected]

Patch available: mermaid-js/mermaid [email protected]

https://github.com/mermaid-js/mermaid/releases/tag/mermaid%4011.15.0
github_commit Patch Available

commit e9b0f34d8d82 (mermaid-js/mermaid)

Patch available: mermaid-js/mermaid [email protected] (contains commit e9b0f34d8d82)

https://github.com/mermaid-js/mermaid/commit/e9b0f34d8d82a6260077764ee45e1d7d90957a0f
github_commit Patch Available

commit 8fead23c5916 (mermaid-js/mermaid)

Patch available: mermaid-js/mermaid v10.9.6 (contains commit 8fead23c5916)

https://github.com/mermaid-js/mermaid/commit/8fead23c59166b7bab6a39eac81acebee2859102
github Patch Available🟡 PoC Available

Improper sanitization of `classDefs` in diagrams leads to CSS injection · Advisory · mermaid-js/mermaid · GitHub

https://github.com/mermaid-js/mermaid/security/advisories/GHSA-xcj9-5m2h-648r

Vendor Advisories for CVE-2026-41148(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFixed inDependents
mermaid—10.9.6—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 41× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-16 17:03 UTCEPSS rescore
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Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-41148?
CVE-2026-41148 is a medium vulnerability published on May 22, 2026. Mermaid is a JavaScript tool that uses Markdown-inspired text to create and modify diagrams and charts. Versions 10.9.5 and prior, in addition to 11.0.0-alpha.1 through 11.12.0 are vulnerable to CSS injection through improper sanitization. The state diagram (and any other diagram type that routes…
When was CVE-2026-41148 disclosed?
CVE-2026-41148 was first published in the National Vulnerability Database on May 22, 2026, with the most recent update on May 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-41148 actively exploited?
CVE-2026-41148 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 25.9% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-41148?
CVE-2026-41148 has a CVSS v4.0 base score of 5.3 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-41148?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-41148, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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