CVE-2021-24903Public exploitNetwork attack vector

Stored XSS via unescaped Back Button Text

Published Feb 28, 2022 · Updated Aug 3, 2024

Stored XSS in CodeEasily GRAND FlaGallery 6.1.2 and earlier allows remote authenticated users to execute script in a viewer's browser. The Back Button Text gallery setting accepts and stores markup without sanitization, then renders it without escaping in the settings view and pages containing the gallery. High-privilege gallery access is required to plant the payload, and script execution occurs when a user views an affected settings or gallery page.

CVSS severity4.8
Medium
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in CodeEasily GRAND FlaGallery 6.1.2 and earlier allows remote authenticated users to execute script in a viewer's browser. The Back Button Text gallery setting accepts and stores markup without sanitization, then renders it without escaping in the settings view and pages containing the gallery. High-privilege gallery access is required to plant the payload, and script execution occurs when a user views an affected settings or gallery page.

The record

CVE
CVE-2021-24903
Published
Feb 28, 2022
Updated
Aug 3, 2024
Vendor
CodeEasily
Product
GRAND FlaGallery
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Feb 28, 2022CVE 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=6.1.2 <=6.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

CodeEasily · GRAND FlaGalleryversion=6.1.2 <=6.1.2

Published CVSS scores

4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
3.5NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
5.5WordfenceCVSS:3.1/AV:N/AC:L/PR:H/UI:N/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript

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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