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VulnerabilityPublished

CVE-2026-66296: lud oaskit · Cross-site Scripting

Affects lud oaskitSource CVE Database V5

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Not known to be exploited · CVSS 5.1 Medium : upgrade to 0.14.1 when convenient.

Data as of 1 Nov 2026, 22:58 UTC

CVSS 4.0 base score
5.1Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 30% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 0.14.1, b70c6b2eaf0b11bdd0bbb21b8a87dbb3d46918a1
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 Aug 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 1 Nov 2026.

What to do

Upgrade oaskit to 0.14.1; oaskit to b70c6b2eaf0b11bdd0bbb21b8a87dbb3d46918a1.

Affected software

ProductAffectedFixed in
ludoaskitAffected
  • >=0.1.0 <0.14.1
Fixed in
  • 0.14.1
ludoaskitAffected
  • ≥ 552de8ca0ff60617bea58bcafa451892d61a161c, < b70c6b2eaf0b11bdd0bbb21b8a87dbb3d46918a1
Fixed in
  • b70c6b2eaf0b11bdd0bbb21b8a87dbb3d46918a1
Hexoaskitpkg:hex/oaskitOther threatsAffected
  • >=0.1.0 <0.14.1
Fixed in
  • 0.14.1

CPE configurations (1)

  • cpe:2.3:a:lud:oaskit:*:*:*:*:*:elixir:*:*

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

AI-suggested

If you cannot patch yet, consider disabling the default HTML error handler or the :html_errors option in Oaskit.Plugs.ValidateRequest if feasible to prevent rendering of unescaped user input in error pages. Review application usage of oaskit and apply any vendor-provided updates or workarounds once published.

Description

Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in lud oaskit allows reflected cross-site scripting via the default HTML error handler. Oaskit.ErrorHandler.Default.format_reason/4 and Oaskit.ErrorHandler.Default.reason_to_html/1 in lib/oaskit/error_handler/default.ex render request-validation failures as an HTML page whenever the request's Accept header contains html, interpolating request-controlled strings into that page without HTML escaping. The unescaped values are object keys taken from a request body or from an object or deepObject query parameter, which appear in the JSON Schema error's instance path when a schema rejects them (for example under additionalProperties: false), and the raw Content-Type header, reflected in unsupported-media-type errors when it fails to parse. Because browsers send Accept: text/html on ordinary top-level navigation, a crafted GET link is sufficient to trigger the error page; no form submission, custom Content-Type, or attacker-controlled script on the victim's side is required. A payload such as filter[</code></h2><script>alert(document.domain)</script>]=x terminates the enclosing markup and the injected script executes in the origin of the application using oaskit, giving it access to that origin's cookies, session, and same-origin responses. Both HTML error rendering and the vulnerable handler are enabled by default: Oaskit.Plugs.ValidateRequest defaults :html_errors to true and :error_handler to Oaskit.ErrorHandler.Default, so applications following the documented usage are affected without any opt-in. This issue affects oaskit: from 0.1.0 before 0.14.1.

References

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