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Fencer Intel
medium 6.1

CVE-2016-10547 json

Cross-Site Scripting in nunjucks

published 2018-05-31 8 y ago modified 2026-06-17 4 mo ago also GHSA-f7ph-p5rv-phw2 , EUVD-2018-0746

cvss
6.1
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.4%
EPSS 1.4% chance of exploitation in 30 days, percentile 72%
public exploits
0
none known

Summary

Nunjucks is a full featured templating engine for JavaScript. Versions 2.4.2 and lower have a cross site scripting (XSS) vulnerability in autoescape mode. In autoescape mode, all template vars should automatically be escaped. By using an array for the keys, such as `name[]=<script>alert(1)</script>`, it is possible to bypass autoescaping and inject content into the DOM.

Patch / fix

  • npm nunjucks 2.4.3

Exploit prediction

1.39% chance of exploitation in the next 30 days, higher than 72% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/mozilla/nunjucks/issues/835 referenced PoC, tagged "exploit" by a source, unverified
  • nodesecurity.io https://nodesecurity.io/advisories/147 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/matt-/nunjucks_test referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 6.1 CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected packages

ecosystem package affected fixed in
npm nunjucks
<2.4.3
2.4.3

Affected products

  • HackerOne nunjucks node module

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.