CVE-2021-47746Public exploitNetwork attack vector

Arbitrary file overwrite via traversal-controlled upload path

Published Jan 21, 2026 · Updated Jan 21, 2026

Path traversal in NodeBB Plugin Emoji 3.2.1 allows remote authenticated users to overwrite arbitrary files through its emoji upload API. The /api/admin/plugins/emoji/upload endpoint uses the attacker-controlled fileName field as a destination path without confining traversal sequences to the emoji directory. Administrative access is required, and files are written with the NodeBB process's filesystem permissions.

CVSS severity8.6
High
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in NodeBB Plugin Emoji 3.2.1 allows remote authenticated users to overwrite arbitrary files through its emoji upload API. The /api/admin/plugins/emoji/upload endpoint uses the attacker-controlled fileName field as a destination path without confining traversal sequences to the emoji directory. Administrative access is required, and files are written with the NodeBB process's filesystem permissions.

The record

CVE
CVE-2021-47746
Published
Jan 21, 2026
Updated
Jan 21, 2026
Vendor
NodeBB
Product
NodeBB Plugin Emoji
Classifications
CWE-73, T1098.004
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jan 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

NodeBB · NodeBB Plugin Emojiversion=3.2.1

Published CVSS scores

7.5VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
8.6VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-73External Control of File Name or Path
T1098.004Account Manipulation: SSH Authorized Keys

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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