CVE-2026-26226
CVE-2026-26226 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.
Key facts
- Severity: Medium (CVSS 4.0 base score 5.3)
- EPSS exploit prediction: 1% (40th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-7382
- Weakness: CWE-79
- Published:
- Last modified:
Description
beautiful-mermaid versions prior to 0.1.3 contain an SVG attribute injection issue that can lead to cross-site scripting (XSS) when rendering attacker-controlled Mermaid diagrams. User-controlled values from Mermaid style and classDef directives are interpolated into SVG attribute values without proper escaping, allowing crafted input to break out of an attribute context and inject arbitrary SVG elements/attributes into the rendered output. When the generated SVG is embedded in a web page, this can result in script execution in the context of the embedding origin.
Frequently asked questions
- What is CVE-2026-26226?
- beautiful-mermaid versions prior to 0.1.3 contain an SVG attribute injection issue that can lead to cross-site scripting (XSS) when rendering attacker-controlled Mermaid diagrams. User-controlled values from Mermaid style and classDef directives are interpolated into SVG attribute values without proper escaping, allowing crafted input to break out of an attribute context and inject arbitrary SVG elements/attributes into the rendered output. When the generated SVG is embedded in a web page, this can result in script execution in the context of the embedding origin.
- How severe is CVE-2026-26226?
- CVE-2026-26226 has a CVSS 4.0 base score of 5.3, rated medium severity.
- Is CVE-2026-26226 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
- How do I fix CVE-2026-26226?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-26226 have an EU (EUVD) identifier?
- Yes. CVE-2026-26226 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-7382.
- When was CVE-2026-26226 published?
- CVE-2026-26226 was published on 2026-02-13 and last updated on 2026-06-17.
References
- https://github.com/lukilabs/beautiful-mermaid/pull/8
- https://github.com/lukilabs/beautiful-mermaid/releases/tag/v0.1.3
- https://neo.projectdiscovery.io/share/cec71dc7-a8eb-417e-b8b4-666644796c1e
- https://www.vulncheck.com/advisories/beautiful-mermaid-svg-attribute-injection
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