CVE-2021-23673Public exploitNetwork attack vector

Cross-site scripting via unescaped upload filename rendering

Published Nov 22, 2021 · Updated Sep 17, 2024

Cross-site scripting in Pekebyte pekeUpload 2.1.1 and earlier allows remote attackers to execute JavaScript via a crafted upload filename. The upload queue's updateList function concatenates file.name into a span within an HTML string without encoding it, causing filename markup to become DOM content. Exploitation requires a user to select the attacker-supplied file, after which the browser executes the filename's script in the page context.

CVSS severity6.1
Medium
EPSS probability0.84%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Cross-site scripting in Pekebyte pekeUpload 2.1.1 and earlier allows remote attackers to execute JavaScript via a crafted upload filename. The upload queue's updateList function concatenates file.name into a span within an HTML string without encoding it, causing filename markup to become DOM content. Exploitation requires a user to select the attacker-supplied file, after which the browser executes the filename's script in the page context.

The record

CVE
CVE-2021-23673
Published
Nov 22, 2021
Updated
Sep 17, 2024
Vendor
Pekebyte
Product
pekeUpload
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0 <unspecified

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Pekebyte · pekeUploadversion=0 <unspecified

Published CVSS scores

5.4SnykCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A: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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

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

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo