Summary
@excalidraw/excalidraw Cross-site Scripting vulnerability
Workarounds
No workaround without upgrading unless deployed in environments without untrusted user input.
References
https://security.snyk.io/vuln/SNYK-JS-EXCALIDRAWEXCALIDRAW-5841658
https://github.com/excalidraw/excalidraw/pull/6728
Impact
XSS vulnerability due to improperly sanitizing URLs of links that can be attached on canvas elements. This affects users of the npm package @excalidraw/excalidraw provided it was deployed in environments where untrusted user input in drawings that are then shared with third parties is a concern. If you only hosted the editor in trusted environments, or sharing didn't take place, the impact is minimized.
Untrusted input is rendered as active markup in a victim's browser, which can run script in their session. Typical impact: session or credential theft, and actions taken as the user.
CVE-2023-26140 has a CVSS score of 6.1 (Medium). The vector is network-reachable, no privileges required, and user interaction required. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (0.15.3); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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Patch is available on version 0.15.3 and up (stable), or latest @excalidraw/excalidraw@next (unstable releases).
Frequently Asked Questions
- What is CVE-2023-26140? CVE-2023-26140 is a medium-severity cross-site scripting (XSS) vulnerability in @excalidraw/excalidraw (npm), affecting versions < 0.15.3. It is fixed in 0.15.3. Untrusted input is rendered as active markup in a victim's browser, which can run script in their session.
- How severe is CVE-2023-26140? CVE-2023-26140 has a CVSS score of 6.1 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
- Which versions of @excalidraw/excalidraw are affected by CVE-2023-26140? @excalidraw/excalidraw (npm) versions < 0.15.3 is affected.
- Is there a fix for CVE-2023-26140? Yes. CVE-2023-26140 is fixed in 0.15.3. Upgrade to this version or later.
- Is CVE-2023-26140 exploitable, and should I be worried? Whether CVE-2023-26140 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
- What actually determines whether CVE-2023-26140 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
- How do I fix CVE-2023-26140? Upgrade
@excalidraw/excalidrawto 0.15.3 or later.