CVE-2023-2142 | Nunjucks autoescape bypass leads to cross site scripting

In Nunjucks versions prior to version 3.2.4, it was possible to bypass the restrictions which are provided by the autoescape functionality. If there are two user-controlled parameters on the same line used in the views, it was possible to inject cross site scripting payloads using the backslash \ character.

Published: 2024-11-26 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2023-2142 is rated Low Risk (34.1/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.36%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2023-2142

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.22% 0.36% +0.14%
2 2026-05-29 0.28% 0.22% -0.07%
3 2026-05-27 — 0.28% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2023-2142

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2023-2142

GitHub Security Advisory for CVE-2023-2142

GHSA-x77j-w7wf-fjmw · Severity: medium · Ecosystem: npm — Nunjucks autoescape bypass leads to cross site scripting

OS Trackers for CVE-2023-2142

vendor priority summary link
debian not yet assigned CVE-2023-2142 not yet assigned priority: Debian including 1 source packages (node-nunjucks), 4 status rows across 4 suites (bookworm, forky, sid, trixie): resolved 3, open 1. https://security-tracker.debian.org/tracker/CVE-2023-2142
redhat medium — https://access.redhat.com/security/cve/CVE-2023-2142
ubuntu medium CVE-2023-2142 medium priority: Ubuntu including 1 source packages (node-nunjucks), 7 status rows across 7 suites (focal, jammy, noble, oracular, plucky, questing, upstream): needs-triage 3, DNE 2, ignored 2. https://ubuntu.com/security/CVE-2023-2142

Affected software / configurations for CVE-2023-2142

Vendor Product Version Raw CPE
mozilla nunjucks < 3.2.4 cpe:2.3:a:mozilla:nunjucks:*:*:*:*:*:*:*:*

References for CVE-2023-2142

cvelogic Threat Intelligence