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CVE-2026-113657Proof of concept (PoC) published · CISA

ApostropheCMS sanitize-html: SMIL animation namespace-prefix bypass allows javascript: URI injection (XSS)

CVSS score

3.7

EPSS probability

—

Risk score

0.4

Published

1 h ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

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Vulnerability description

DayBreach AI Explanation

Verified against sources

ApostropheCMS sanitize-html SMIL Animation Namespace-Prefix Bypass Vulnerability

Sources read

1

Source agreement

Tam uyum

Evidence confidence

%55

Short explanation

An issue in ApostropheCMS sanitize-html allows namespace-prefixed SVG animation elements to bypass SMIL URL protection, resulting in javascript: URI injection (XSS).

Why does it matter?

When configurations permit namespace-prefixed SVG animation elements in affected versions, script execution can occur upon user interaction with the affected link.

What should be done?

  • Upgrade the sanitize-html package following vendor advisories.
  • Review application configurations regarding SVG animations.
Chain of evidence and sources2 verified claims

sanitize-html 2.17.7 ile 2.18.0 sürümleri arasında ad alanı öneki olan SVG animasyon ögeleri SMIL URL korumasını atlayabilir.

S0 · daybreach-canonicalS1 · cvelist

Bu durum, işlenmiş SVG render edildikten sonra bağlantı hedefinin güvensiz bir URI ile değiştirilmesine neden olur.

S0 · daybreach-canonicalS1 · cvelist
Show the technical text from the sources

ApostropheCMS is an open-source Node.js content management system, and sanitize-html provides a simple HTML sanitizer with a clear API. From sanitize-html 2.17.7 until 2.18.0, an application configuration that permits namespace-prefixed SVG animation elements and the relevant URL-targeting attributes can bypass the SMIL URL protection because prefixed tag names do not match the unprefixed animation-element check. The bypass can rewrite a link destination to an unsafe URI after the sanitized SVG is rendered, with script execution occurring when a user activates the affected link; the default sanitizer configuration is not unconditionally affected. This issue is fixed in sanitize-html 2.18.0.

CVSS vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

CWE: CWE-79

This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-113657 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1apostrophecmsapostrophe View
2apostrophecmssanitize-html View
3npmsanitize-html View
Total affected vendors: 2|Products: 3

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
3.7CVSS V3_1LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:NCVE CNA
3.7CVSS V31LOWCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:NNVD
3.7CVSS 3.x—Vector not publishedGitHub Advisory
0.0CVSS 4.0—Vector not publishedGitHub Advisory

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-113657 is associated with the following CWEs:

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-113657 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsLow
UserGerekiyor

Official Sources and Advisories

https://github.com/apostrophecms/apostrophe/security/advisories/GHSA-374f-7chj-9948vendor-advisoryhttps://github.com/apostrophecms/apostrophe/commit/9500b8b0e1d630d5e07fbb5fd2c25ed0943845cevendor-advisoryhttps://github.com/apostrophecms/apostrophe/commit/f84fd41cbf6c22eb8d0008fc9c25df1f7130b350vendor-advisoryhttps://github.com/apostrophecms/apostrophe/releases/tag/sanitize-html@2.18.0vendor-advisoryhttps://github.com/advisories/GHSA-374f-7chj-9948vendor-advisory

CVSS Vector Radar Chart

3.7 / 10
Attack VectorNetworkComplexityHighPrivilegesLowUser Interact.RequiredConfidentialityHighIntegrityLowAvailabilityNone

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N
Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredLow privileges
User Interaction—
Confidentiality (Gizlilik)High
Integrity (Bütünlük)Low
Availability (Erişilebilirlik)None

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

A
apostrophecms logo
apostrophecms
N
npm logo
npm

Weakness Type (CWE & CAPEC)

CWE-79

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CVE-2026-113657 · ApostropheCMS sanitize-html: SMIL…