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VulnerabilityPublished

CVE-2026-113657: apostrophecms apostrophe · Cross-site Scripting

Affects apostrophecms apostropheSource CVE Database V5

0

Not known to be exploited · CVSS 3.7 Low : upgrade to 4.33.0 when convenient.

Data as of 26 Oct 2026, 13:47 UTC

CVSS 3.1 base score
3.7Low
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 23% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.33.0, 2.18.0
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 20 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade apostrophe to 4.33.0; sanitize-html to 2.18.0; sanitize-html to 4.33.0 or 2.18.0.

Affected software

ProductAffectedFixed in
apostrophecmsapostropheAffected
  • <4.33.0
Fixed in
  • 4.33.0
apostrophecmssanitize-htmlAffected
  • >=2.17.7 <2.18.0
Fixed in
  • 2.18.0
npmsanitize-htmlpkg:npm/sanitize-htmlOther threatsAffected
  • <2.18.0
  • <4.33.0
  • >=2.17.7 <2.18.0
Fixed in
  • 2.18.0
  • 4.33.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade sanitize-html to version 2.18.0 or later, where this vulnerability is fixed. Review application configurations that permit namespace-prefixed SVG animation elements and URL-targeting attributes to ensure they do not allow unsafe URIs. Since the default sanitizer configuration is not unconditionally affected, verify if your configuration is impacted and adjust accordingly.

Description

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.

References

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