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VulnerabilityPublished

CVE-2026-44267: enspirit elo · Cross-site Scripting

Affects enspirit eloSource CVE Database V5

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Not known to be exploited · CVSS 9.8 Critical : upgrade to 1.0.1 as a priority.

Data as of 3 Nov 2026, 18:14 UTC

CVSS 3.1 base score
9.8Critical
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 3.19.8
Patch
Available – fixed in 1.0.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 3 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 3 Nov 2026.

What to do

Upgrade elo and enspirit/elo to 1.0.1.

Affected software

ProductAffectedFixed in
enspiriteloAffected
  • <1.0.1
Fixed in
  • 1.0.1
GitHubenspirit/elopkg:github/enspirit/eloOther threatsAffected
  • <1.0.1
Fixed in
  • 1.0.1

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

AI-suggested

Upgrade to Elo version 1.0.1 or later, where this vulnerability is fixed. No other mitigation is required as the fix addresses the root cause by rejecting meta-properties and properly handling the 'constructor' identifier.

Description

CVE-2026-44267 is a critical cross-site scripting (XSS) vulnerability in the Elo expression language used by enspirit. Versions prior to 1.0.1 allow attacker-controlled strings to execute arbitrary JavaScript code via the .constructor.constructor property. This flaw affects the defaultFormats.elo.parse() function, the bin/elo CLI, and the elo-lang.org/try playground, enabling browser script execution and session compromise. It also permits arbitrary Node.js code execution in environments using the library. The issue is fixed in version 1.0.1.

References

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