CVE-2023-28784Network attack vector

Unauthenticated script execution via reflected input

Published Jun 22, 2023 · Updated Apr 28, 2026

Reflected XSS in Contest Gallery 21.1.2 and earlier allows remote attackers to execute scripts through a crafted request opened by a user. Public advisories do not identify the affected parameter or code locus; they attribute the reflected output to insufficient input sanitization and output escaping. Exploitation requires a user to open the attacker-crafted URL, after which script code runs in that user's browser context.

CVSS severity7.1
High
EPSS probability0.38%
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

Reflected XSS in Contest Gallery 21.1.2 and earlier allows remote attackers to execute scripts through a crafted request opened by a user. Public advisories do not identify the affected parameter or code locus; they attribute the reflected output to insufficient input sanitization and output escaping. Exploitation requires a user to open the attacker-crafted URL, after which script code runs in that user's browser context.

The record

CVE
CVE-2023-28784
Published
Jun 22, 2023
Updated
Apr 28, 2026
Vendor
Wasiliy Strecker / ContestGallery developer
Product
Contest Gallery
Classifications
CWE-79, CAPEC-591, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 22, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 2026Record 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=n/a <=21.1.2 changes=[{"at":"21.1.2.1","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Wasiliy Strecker / ContestGallery developer · Contest Galleryversion=n/a <=21.1.2 changes=[{"at":"21.1.2.1","status":"unaffected"}]

Published CVSS scores

7.1PatchstackCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-591Reflected XSS
T1189Drive-by Compromise

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

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