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Response snapshot Oct 26, 2026, 22:09 UTC

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VulnerabilityCVE-2026-113654

ApostropheCMS sanitize-html: nonTextTags discard region ends early on an implied close, letting <noscript> content render

`sanitize-html` discards the *content* of every element in `nonTextTags`. It delimits that region using htmlparser2's close events, and ignores the `isImplied` flag htmlparser2 passes it.

Published Updated

At a glance

Exploited
Not known
Severity
5.3 Medium (CVSS 4.0)
Chance of exploitation
0.3% in the next 30 days
Sources
1 source

What to do

GitHub lists first patched versions: sanitize-html: 2.18.0. Confirm the affected range and upgrade guidance in the exact advisory.

Read GitHub-reviewed advisory GHSA-x3q4-9hxx-gx8m (opens a new tab)

What happened

## Summary

`sanitize-html` discards the *content* of every element in `nonTextTags`. It delimits that region using htmlparser2's close events, and ignores the `isImplied` flag htmlparser2 passes it. Closing a still-open **ancestor** from inside a ` ` makes htmlparser2 unwind its stack past the `noscript`; the synthetic implied close it emits on the way ends the discard region early, and everything after it is treated as ordinary body content.

A browser with scripting enabled parses ` ` content as **raw text**, so the same markup renders as inert text there. The sanitizer therefore emits elements the page itself would not have.

## Reproduction

Continue reading

```js const sanitizeHtml = require("sanitize-html");

sanitizeHtml('

', { allowedTags: ["div", "img"], allowedAttributes: { img: ["src"] }, nonTextTags: ["script", "style", "textarea", "option", "noscript"], }); // => '

' ```

Chrome, given the same input, renders **no** ` ` — the whole payload is raw text inside the unclosed ` `. Verified with Playwright, `srcdoc` into an iframe so the scripting flag is on.

A ` Hi

]]> Reset your password ```

htmlparser2 runs a CDATA token to `]]>`; Chrome ends a bogus comment at the first `>`, so the ` ` after it is real to the browser and invisible to the parser.

## Where the behaviour is

`index.js`:

- `:154` — `nonTextTagsArray` (the default list, `['script','style','textarea','option','xmp']`). - `:638` — `onclosetag: function (name, isImplied)` — receives the flag. - `:644` — `skipTextDepth--` — decrements without consulting `isImplied`.

## Suggested fix

Do not end a discard region on an implied close. htmlparser2 already distinguishes them; the flag is passed and discarded. Something close to:

```js onclosetag: function (name, isImplied) { if (skipText) { if (isImplied) return; // an implied close must not end the region skipTextDepth--; … ```

Affected package ranges reported by GitHub: sanitize-html: < 2.18.0

Scores and how they were measured

CVSS base severity

5.3

Version 4.0As of

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Measurement source (opens a new tab)

How bad it is if exploited. Not a prediction of exploitation or proof you are exposed.

EPSS probability

0.3%

Scored Percentile 28.2%

Model and measurement source (opens a new tab)

A model's estimate of exploitation in the next 30 days, not certainty or your own risk.

Related technology

Sources

  1. Primary source

    GitHub-reviewed advisory GHSA-x3q4-9hxx-gx8m (opens a new tab)

    The public advisory supplies the description, affected package/version ranges, and any listed CVSS metric. GitHub review is not local review.

    Published Checked

  2. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-x3q4-9hxx-gx8m, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  3. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-x3q4-9hxx-gx8m, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  4. Primary source

    GitHub public advisory API page (opens a new tab)

    The API page supplied GHSA-x3q4-9hxx-gx8m, its actual identifiers, source dates, and structured metrics.

    Published Date not suppliedChecked

  5. Primary source

    FIRST measured EPSS score (opens a new tab)

    Measured EPSS probability and percentile for CVE-2026-113654, scored 2026-10-26. This is a model estimate, not proof of exposure.

    Published Checked

Cite this record

For factual claims, cite the primary sources above; cite KEVWire for its compilation, dates, and classifications.

APA

KEVWire. (2026, October 20). ApostropheCMS sanitize-html: nonTextTags discard region ends early on an implied close, letting <noscript> content render (CVE-2026-113654). https://kevwire.com/record/CVE-2026-113654

MLA

"ApostropheCMS sanitize-html: nonTextTags discard region ends early on an implied close, letting <noscript> content render (CVE-2026-113654)." KEVWire, 20 Oct. 2026, kevwire.com/record/CVE-2026-113654.

Chicago

KEVWire. "ApostropheCMS sanitize-html: nonTextTags discard region ends early on an implied close, letting <noscript> content render (CVE-2026-113654)." Last modified October 20, 2026. https://kevwire.com/record/CVE-2026-113654.

Evidence summary (plain text)

ApostropheCMS sanitize-html: nonTextTags discard region ends early on an implied close, letting <noscript> content render (Oct 20, 2026).
`sanitize-html` discards the *content* of every element in `nonTextTags`. It delimits that region
using htmlparser2's close events, and ignores the `isImplied` flag htmlparser2 passes it. Closing a
still-open **ancestor** from inside a ` ` makes htmlparser2 unwind its stack past the
`noscript`; the synthetic implied close it emits on the way ends the discard region early, and
everything after it is treated as ordinary body content.

A browser with scripting enabled parses ` ` content as **raw text**, so the same markup
renders as inert text there. The sanitizer therefore emits elements the page itself would not have.
CVSS 5.3 (version 4.0; evidence as of Oct 20, 2026; https://github.com/advisories/GHSA-x3q4-9hxx-gx8m).
EPSS 0.3% for the following 30 days, scored Oct 26, 2026 (https://api.first.org/data/v1/epss?cve=CVE-2026-113654&date=2026-10-26).
Sources:
GitHub-reviewed advisory GHSA-x3q4-9hxx-gx8m: https://github.com/advisories/GHSA-x3q4-9hxx-gx8m
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yMVQyMDo0NTowN1rOAAfvzQ%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yMVQyMDozMDoyNlrOAAfvxw%3D%3D
GitHub public advisory API page: https://api.github.com/advisories?type=reviewed&per_page=100&sort=updated&direction=desc&after=Y3Vyc29yOnYyOpK0MjAyNi0xMC0yMVQyMDowMzo1N1rOAAfvxQ%3D%3D
FIRST measured EPSS score: https://api.first.org/data/v1/epss?cve=CVE-2026-113654&date=2026-10-26
Record ID: CVE-2026-113654.
Record origin: Ingested record.
AI evidence: Not assessed.
Known exploitation: Not assessed.
Zero-day status: Not assessed. KEV membership alone does not establish zero-day status.
About this data

This record was ingested from a data source. Retrieved: Oct 26, 2026, 19:40 UTC. Ingestion is not an independent editorial investigation.

A CISA KEV listing documents known exploitation, not necessarily a zero-day; absence from the catalog does not prove a vulnerability has never been exploited.

Technology tags indicate possible relevance, not verified exposure. Confirm the affected product, version, and configuration against your own inventory; KEVWire does not scan your systems.

A personal reading checklist on this device, not verified remediation.

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