CVE-2026-49978: cure53 dompurify Cross-site Scripting
CVSS: 6.3v4.0MediumAnalyzed
AliasesUBUNTU-CVE-2026-49978DEBIAN-CVE-2026-49978CGA-6852-w6cx-whmgCGA-9j7j-rfj7-j3qpCGA-fq8h-4hx4-jfwpCGA-g8fx-jp2j-q9p5CGA-gcpm-mfq2-fqm6CGA-h7q7-hhpp-h259CGA-j34v-6w3x-56j9CGA-mcqp-wgpf-8qwvCGA-xwmj-c8jf-r8c2GHSA-rp9w-3fw7-7cwqCGA-27g4-6qmg-48qfCGA-2hc4-7gr6-f3fgCGA-2j73-2h7p-9858CGA-2jgx-25hq-wcmrCGA-2wj7-6jw2-7q5fCGA-3282-wv2c-6j8rCGA-35p4-hvp3-xcw5CGA-364v-h3h4-2896CGA-38p7-j44r-5gpwCGA-39wr-4vhf-3x2rCGA-3g67-rpw2-fhc9CGA-3vrj-v994-jxh7CGA-435w-qxmv-p753CGA-4462-8fpq-3v7vCGA-44gj-2gp4-q493CGA-47fh-v3pg-8m3pCGA-4c8w-3m96-x55qCGA-4x6c-3fjw-f9grCGA-54c7-5f56-6m8mCGA-54j5-p9w7-pwx4CGA-56mv-fg5h-c9f8CGA-5jc4-mrwh-2g7gCGA-5v74-5q3f-vgmxCGA-668p-888m-gcwpCGA-68c8-52gq-p25pCGA-696w-583p-92h8CGA-6fwj-g4cx-gc97CGA-6w46-v368-4rpvCGA-6x4g-m695-7779CGA-72qq-29g2-8256CGA-78fm-43qx-p9ffCGA-78qv-8p46-7mpmCGA-7f66-cx57-pj73CGA-7pgm-gg4j-w4g9CGA-7xwg-288h-g5r6CGA-83vw-4rxj-m378CGA-84h8-3fhq-hwcgCGA-874g-v638-54q3CGA-8cfh-3357-93prCGA-8gr4-hfwr-3gp5CGA-9cmv-mxjm-hmh7CGA-9j2r-6737-8wj9CGA-9qp8-r7f8-cgfjCGA-9qqp-g922-ffg4CGA-c26v-3xc5-qw55CGA-c3rr-4483-f59jCGA-c5fq-8fpm-5jwwCGA-c7f5-w5h6-h4gwCGA-cc33-vc7j-6xmgCGA-cq5w-h5r8-m7x7CGA-cw8j-x6rr-3xf9CGA-f234-rjhf-4cv9CGA-f27f-gj9w-w59hCGA-g226-vc9c-f96xCGA-g242-9cfh-5ff4CGA-g5vp-558f-g45wCGA-g9qr-83jq-93mfCGA-gg92-c867-fcvxCGA-gp34-575w-cg3cCGA-gq3v-xfmh-9crhCGA-gr92-x8mv-jj6gCGA-grvw-2r2v-q53xCGA-gx3q-c646-xvv2CGA-h5gm-7c5c-53pxCGA-hjhp-c899-3hpgCGA-hmwm-c888-6jg8CGA-hpjf-776c-5xxqCGA-j2v7-9rff-8wc2CGA-j8pm-97rj-ffm8CGA-jw8f-5377-9fccCGA-jwmx-3pvh-hfxqCGA-m4mf-2v2h-rjhrCGA-m75g-9p5m-gg7gCGA-m862-rrq9-jjx3CGA-mh75-3whf-3h7wCGA-mq3m-7p8g-c76jCGA-mw6f-v69v-99fhCGA-p66x-43vw-qfv9CGA-p8fv-8hw3-5c9pCGA-pc9v-h2w5-w4mcCGA-q675-pvxh-9697CGA-qp6q-rvqx-h5qqCGA-qrcp-h89v-69wrCGA-r8vv-f85v-vwhjCGA-rc9g-xmw5-pvrjCGA-rgq6-6mf6-f66jCGA-rjq6-cwc4-gf86CGA-rmww-6fqc-vp2fCGA-rp4p-2m4v-c7r7CGA-rqcf-6rv6-jfmvCGA-vffg-9f2p-3wcwCGA-w6g7-38fw-fj5xCGA-wc2h-6pvx-j5h6CGA-wgww-ffp4-4gjwCGA-wpfm-vm5p-249fCGA-x457-x94g-632gCGA-x9j3-h5px-9jx4CGA-x9xp-jq5w-rx8jCGA-xm58-c24f-g5ffCGA-xq4f-533p-6fhrCGA-xrqr-r8pm-cx99CGA-xwmq-v7x5-gcv5
Published 14-07-2026Last modified 21-07-2026
Vulnerability summary
CVE-2026-49978 is a medium (CVSS 6.3) Cross-site Scripting vulnerability in cure53 dompurify. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 33.2% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
6.3/10
010
Medium · v4.0 (CVE.org)EPSS score
0.40%
0%100%
Low · +0.07 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1github
Advisory lineage
Upstream 0 · Downstream 1 · Related 1Timeline
- 14-07-2026PublishedVulnerability first disclosed.
- 21-07-2026Last modifiedVulnerability information updated.
Description
DOMPurify is a DOM-only cross-site scripting sanitizer for HTML, MathML, and SVG. Prior to 3.4.7, DOMPurify IN_PLACE sanitization could skip shadow contents attached to an element inside <template>.content, allowing attacker-controlled markup such as event handlers, JavaScript URLs, or scripts to survive and execute when an application cloned and inserted the sanitized template. This issue is fixed in version 3.4.7.
CVSS metrics
9 scores · 7 sources · 2 versionsMedium 6.3Preferred score · CVE.org (CNA)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:NSources6 sources · 5.1–6.3
- OSV · UbuntuEcosystem advisory · calculated6.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
- OSV · WolfiEcosystem advisory · calculated6.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
- OSV · NpmEcosystem advisory · calculated5.1MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:NDiffers
- OSV · ChainguardEcosystem advisory · calculated6.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/SA:N
- NVDNIST6.3MediumCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:H/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
Medium 6.1Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NSourcesAll 3 agree
- OSV · DebianEcosystem advisory · calculated6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- NVDNIST6.1MediumCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
EPSS trend
Probability
0.40%
Chance of exploitation in the next 30 days
Percentile
33%
Versus all other CVEs
30-day change
+0.07 pp
From 0.33% on 20-09-2026
20-09-202620-10-2026
EPSS score0.40%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundDompurify
Maturity: poc
Weaknesses
CWE · root causeAffected systems
Chainguard50 products
- airflow-2All versions (No fix recorded)
- airflow-core-2All versions (No fix recorded)
- gitlab-rails-ce-18.1All versions (No fix recorded)
- gitlab-rails-ce-18.10All versions (No fix recorded)
- gitlab-rails-ce-18.11All versions (No fix recorded)
Wolfi4 products
- langfuse-3-compat< 3.225.7-r6
- langfuse-3-worker< 3.191.0-r0
- nextcloud-server-32< 32.0.12-r0
- nextcloud-server-33< 33.0.6-r0
Ubuntu2 products
- dompurify.jsAll versions (No fix recorded)
- node-dompurifyAll versions (No fix recorded)
Cure531 product
- dompurify< 3.4.6 | < 3.4.7
Debian1 product
- node-dompurifyAll versions (No fix recorded) | < 3.4.12+dfsg-1
Npm1 product
- dompurify< 3.4.7
6 vendors · 59 products
References
9 links- github.com/cure53/DOMPurify/security/advisories/GHSA-rp9w-3fw7-7cwqX Refsource CONFIRMREPORTAdvisoryWEBVendor AdvisoryExploit
- github.com/cure53/DOMPurify/commit/ca30f070c360df162a3e3848e80e6fd3c9e74bffX Refsource MISCREPORTFIXPatch
- github.com/cure53/DOMPurifyPACKAGE