CVE-2021-32812Network attack vector

Reflected XSS via unescaped error URL

Published Aug 2, 2021 · Updated Aug 3, 2024

Reflected XSS in TekMonks Monkshu 2.90 and earlier allows remote attackers to run script in a victim's browser via a crafted URL. In frontend/server/server.js, two _sendFile error handlers insert req.url into a 500 response without escaping when a file stream fails. Exploitation requires user interaction and a request that triggers the otherwise unspecified stream error; the consequence is script execution in the response's browser context.

CVSS severity4.6
Medium
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in TekMonks Monkshu 2.90 and earlier allows remote attackers to run script in a victim's browser via a crafted URL. In frontend/server/server.js, two _sendFile error handlers insert req.url into a 500 response without escaping when a file stream fails. Exploitation requires user interaction and a request that triggers the otherwise unspecified stream error; the consequence is script execution in the response's browser context.

The record

CVE
CVE-2021-32812
Published
Aug 2, 2021
Updated
Aug 3, 2024
Vendor
TekMonks
Product
Monkshu
Classifications
CWE-79, CWE-116, T1204.001
Attack vector
network
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 2, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record 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=< 2.95

What conditions does exploitation require?

Attack vectornetwork
Required privilegesUnavailable in this record.

What is affected?

TekMonks · Monkshuversion=< 2.95

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.6GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CWE-116Improper Encoding or Escaping of Output
T1204.001Malicious Link

Public exploit references

No public exploit references are available in this record.

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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