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VulnerabilityPublished

CVE-2026-126070: Action View · Possible XSS vulnerability in strip_tags

Affects actionviewSource GCVE Database

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Authoritative record:CVE-2026-126070· Medium 6.1

Not known to be exploited · CVSS 6.1 Medium : upgrade to 8.1.4.1 when convenient.

Data as of 13 Nov 2026, 00:06 UTC

CVSS 3.1 base score
6.1Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.16.1
Patch
Available – fixed in 8.1.4.1, 8.0.5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 10 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: 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 12 Nov 2026.

What to do

Upgrade actionview to 8.1.4.1; actionview to 8.0.5.2.

Affected software

ProductAffectedFixed in
RubyGemsactionviewAffected
  • >=8.1.0.beta1 <8.1.4.1
Fixed in
  • 8.1.4.1
RubyGemsactionviewAffected
  • <8.0.5.2
Fixed in
  • 8.0.5.2

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

Description

### Impact `strip_tags` in Action View returns its sanitized output marked `html_safe`, but the underlying sanitizer encodes only `&`, `<` and `>`, leaving `"` and `'` unencoded. Because ERB does not escape a string marked `html_safe`, untrusted input passed through `strip_tags` and rendered inside a quoted HTML attribute value could close the attribute and add new attributes, possibly leading to XSS. Applications that render `strip_tags` output from untrusted input inside an HTML attribute, for example in a `title` attribute or a `<meta content>` tag, are affected. Output rendered as element content is not affected. ### Details `strip_tags` now encodes `"` and `'` in its output, as well as `&`, `<` and `>`, without double-encoding existing entities. Applications that use `strip_tags` output outside HTML, such as in a text template or JSON, now see `&quot;` and `&#39;` where they saw `"` and `'`; `CGI.unescapeHTML` decodes them. See the Action View CHANGELOG. ### Workarounds Pass `strip_tags` output to an attribute through a tag helper, which escapes attribute values, for example `tag.a(title: strip_tags(user_input))`. ### Releases The fixed releases are available at the normal locations. Patches for those who cannot upgrade at once: - 8.1: https://github.com/rails/rails/commit/568b19cb860322885593e308a7f27aceb779e9d7.patch - 8.0: https://github.com/rails/rails/commit/c3772a10f405f9644125cbb484adfd2aa7a25a59.patch ### Credit This issue was responsibly reported by HackerOne researcher [lucasluitjes](https://hackerone.com/lucasluitjes).

References

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