SunEditor before 3.4.0 Stored XSS via Link Modal Bookmark List
SunEditor versions before 3.4.0 are affected in the default configuration, with no special options needed. Fixed in 3.4.0.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 3.4.0
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. SunEditor versions before 3.4.0 are affected Default configuration; no special options needed A victim must open the link modal and type # in the URL input
- Last modified
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 16/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Specific setups only
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Unknown. No tracked technology or package matched
- Severity8.3/10CVSS 8.3
- No patch0/5No signal
What would change the score
- Would score about 66 if added to CISA KEV
- Would score about 61 if CISA's SSVC rates exploitation active
- Would score about 23 if CISA's SSVC rates it automatable
What to do
Check whether your setup matches what the bug needs.
SunEditor versions before 3.4.0 are affected Default configuration; no special options needed A victim must open the link modal and type # in the URL inputUpgrade to a fixed version: 3.4.0.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- JiHong88 suneditor
fixed in 3.4.0
Evidence 2
- Advisory
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-124492
Is CVE-2026-124492 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
SunEditor stores attacker-supplied JavaScript that runs in the browser of a user who opens the link modal and types # in the URL input. That script can steal session cookies and perform actions as the victim.Source: vulncheck.com, github.com
Which versions are affected by CVE-2026-124492?
suneditor: before 3.4.0.Source: cve.now feed data
Am I affected, and how do I check?
SunEditor versions before 3.4.0 are affected, and the default configuration is included, with no special options needed. To check, look at the SunEditor version in the project's package.json or installed dependency list.Source: vulncheck.com, github.com
How do I fix CVE-2026-124492?
Upgrade SunEditor to 3.4.0 or later, which is the fixed version. The facts list no workaround.Source: vulncheck.com, github.com