CVE-2024-29921Network attack vector

Administrator-level stored XSS via unfiltered gallery captions

Published Mar 27, 2024 · Updated May 11, 2026

Stored XSS in gallery captions in Photo Gallery by Supsystic 1.15.16 and earlier allows remote authenticated users to run scripts. Administrator-supplied caption values pass into Twig gallery output without stripping executable markup, allowing stored script injection. Administrator access is required, and the script runs when another user views the affected gallery; the vulnerable path is limited to multisite installations or sites with unfiltered_html disabled.

CVSS severity4.8
Medium
EPSS probability0.34%
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 gallery captions in Photo Gallery by Supsystic 1.15.16 and earlier allows remote authenticated users to run scripts. Administrator-supplied caption values pass into Twig gallery output without stripping executable markup, allowing stored script injection. Administrator access is required, and the script runs when another user views the affected gallery; the vulnerable path is limited to multisite installations or sites with unfiltered_html disabled.

The record

CVE
CVE-2024-29921
Published
Mar 27, 2024
Updated
May 11, 2026
Vendor
Supsystic
Product
Photo Gallery by Supsystic
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 27, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=0 <=1.15.16 changes=[{"at":"1.15.17","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Supsystic · Photo Gallery by Supsysticversion=0 <=1.15.16 changes=[{"at":"1.15.17","status":"unaffected"}]

Published CVSS scores

5.9PatchstackCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
4.8NVDCVSS:3.1/AV:N/AC:L/PR:H/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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007JavaScript/JScript

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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