6.1

CVE-2026-116802: DOMPurify before 3.4.17 XSS via SMIL attributeName Guard Bypass in XHTML Mode

Awaiting analysis
AliasesGHSA-c6gr-qvv4-5v3fDEBIAN-CVE-2026-116802UBUNTU-CVE-2026-116802
Published 26-10-2026Last modified 26-10-2026

Vulnerability summary

CVE-2026-116802 is a medium (CVSS 6.1) vulnerability in cure53 dompurify. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 12.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.1, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
6.1/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.22%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 26-10-2026
    PublishedVulnerability first disclosed.

Description

DOMPurify before 3.4.17 contains a cross-site scripting vulnerability that allows attackers to bypass the SMIL attributeName=href guard when PARSER_MEDIA_TYPE is application/xhtml+xml, because transformCaseFunc does not lowercase attribute names. Attackers can submit SVG with an animate or set element using attributeName="href" and a javascript: entry in values to execute script when users click the sanitized link.

CVSS metrics

7 scores · 4 sources · 2 versions

EPSS trend

Probability

0.22%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

27-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Cure531 product
Debian1 product
  • node-dompurifyAll versions (No fix recorded) | < 3.4.17+dfsg-1
Npm1 product
  • dompurify< 3.4.17
Ubuntu1 product
  • node-dompurifyAll versions (No fix recorded)

4 vendors · 4 products

References

9 links