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CVE-2023-2142

Nunjucks autoescape bypass leads to cross site scripting

MEDIUM
6.1
CVSS Score
Published: November 26, 2024 at 11:24 AM UTC
Updated: June 17, 2026 at 05:51 AM UTC
1 product affected across 1 vendorNunjucks

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Severity
MEDIUM6.1
Exploit prediction
EPSS 0.4%
SSVC
PoC

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Nunjucks· Mozilla
95%
v < 3.2.4
Affected range stops below 3.2.4, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

Issue TrackingPermissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1825980
Vendor Advisory
Source: [email protected]
https://github.com/mozilla/nunjucks/security/advisories/GHSA-x77j-w7wf-fjmw

SSVC — Action Prioritization

SSVCPoCNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.1MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-79

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