Bug 2493377 (CVE-2026-6658)
| Summary: | CVE-2026-6658 nbconvert: nbconvert: Cross-site Scripting via unsanitized Mermaid output in HTML exports | ||
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| Product: | [Other] Security Response | Reporter: | OSIDB Bzimport <bzimport> |
| Component: | vulnerability | Assignee: | Product Security <prodsec-ir-bot> |
| Status: | NEW --- | QA Contact: | |
| Severity: | medium | Docs Contact: | |
| Priority: | medium | ||
| Version: | unspecified | CC: | anthomas, ehelms, ggainey, jkoehler, jpasqual, juwatts, lphiri, mhulan, nmoumoul, osousa, pcreech, rchan, rjohnson, sdawley, smallamp, tmalecek |
| Target Milestone: | --- | Keywords: | Security |
| Target Release: | --- | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | --- | |
| Doc Text: |
A flaw was found in nbconvert. This vulnerability allows a remote attacker to perform Cross-site Scripting (XSS) by injecting arbitrary HTML or JavaScript code. This occurs due to unsanitized `text/vnd.mermaid` output in HTML exports, where the `data_mermaid` block directly renders cell output without proper escaping. Successful exploitation enables attackers to execute arbitrary JavaScript in the context of users viewing the exported HTML notebooks.
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Story Points: | --- |
| Clone Of: | Environment: | ||
| Last Closed: | Type: | --- | |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
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Description
OSIDB Bzimport
2026-06-26 10:01:11 UTC
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