Contest Gallery <= 28.1.6 - Unauthenticated SQL Injection

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Summary

CVECVE-2026-8912
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-19 13:16:20 UTC
Updated2026-05-19 14:38:39 UTC
DescriptionThe Contest Gallery plugin for WordPress is vulnerable to SQL Injection via the 'form_input' parameter in versions up to, and including, 28.1.6. This is due to insufficient escaping on the user supplied parameter and lack of sufficient preparation on the existing SQL query inside the unauthenticated 'post_cg_gallery_form_upload' AJAX action (specifically the 'cb' branch of the included users-upload-check.php, where $f_input_id is concatenated unquoted into 'SELECT Field_Content FROM ... WHERE id = $f_input_id'). The endpoint is gated only by a public frontend nonce ('cg1l_action' / 'cg_nonce') that is exposed in the page source of any public gallery page. This makes it possible for unauthenticated attackers to append additional SQL queries into already existing queries that can be used to extract sensitive information from the database.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.000980000 probability, percentile 0.267210000 (date 2026-05-26)

Problem Types: CWE-89 | CWE-89 CWE-89 Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Contest-gallery Contest Gallery Upload Vote Photos Media Sell With PayPal Stripe affected 28.1.6 semver Not specified

References

ReferenceSourceLinkTags
plugins.trac.wordpress.org/browser/contest-gallery/tags/28.1.5/ajax/ajax-functions-front... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contest-gallery/tags/28.1.5/functions/frontend/cg-gen... [email protected] plugins.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/71f2f8c4-00ee-4ab4-b0e0-9ddac... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/contest-gallery/tags/28.1.5/v10/v10-frontend/user_upl... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/contest-gallery/tags/28.1.5/v10/v10-frontend/user_upl... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Leonid Semenenko (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-05-18T22:31:56.000ZVendor Notified
CNA2026-05-18T00:00:00.000ZDisclosed
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