CVE-2026-124492
SunEditor before 3.4.0 Stored XSS via Link Modal Bookmark List
SunEditor before 3.4.0 contains a stored cross-site scripting vulnerability in ModalAnchorEditor's #createBookmarkList, which inserts entity-decoded h1-h6 header textContent into the bookmark list via innerHTML without escaping. Attackers can store HTML-encoded payloads in editor headers that execute JavaScript when a victim opens the link modal and types # in the URL input.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| suneditor JiHong88 |
≥ 0; < 3.4.0 (affected, semver) 3.4.0 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 8.3 high |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N | CNA: VulnCheck |
| 3.1 / 7.6 high |
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N | CNA: VulnCheck |
| 4.0 / 8.3 high |
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD: [email protected] |
| 3.1 / 7.6 high |
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N | NVD: [email protected] |
Exploit evidence
- https://github.com/JiHong88/suneditor/security/advisories/GHSA-5pp5-5qrp-vq56
exploit · ADP: CISA-ADP
References
- https://github.com/JiHong88/suneditor/security/advisories/GHSA-5pp5-5qrp-vq56CNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/suneditor-before-3.4.0-stored-xss-via-link-modal-bookmark-listCNA: VulnCheck · third-party-advisory
- https://github.com/JiHong88/suneditor/security/advisories/GHSA-5pp5-5qrp-vq56ADP: CISA-ADP · exploit
- https://github.com/JiHong88/suneditor/security/advisories/GHSA-5pp5-5qrp-vq56[email protected]
- https://www.vulncheck.com/advisories/suneditor-before-3.4.0-stored-xss-via-link-modal-bookmark-list[email protected]
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