Sydney <= 2.56 - Missing Authorization to Authenticated (Subscriber+) Limited Theme Options Update

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Summary

CVECVE-2025-8999
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-17 12:15:38 UTC
Updated2026-04-08 18:25:23 UTC
DescriptionThe Sydney theme for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'activate_modules' function in all versions up to, and including, 2.56. This makes it possible for authenticated attackers, with Subscriber-level access and above, to activate or deactivate various theme modules.

Risk And Classification

Primary CVSS: v3.1 5.3 MEDIUM from [email protected]

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

EPSS: 0.000420000 probability, percentile 0.127300000 (date 2026-04-08)

Problem Types: CWE-862 | CWE-862 CWE-862 Missing Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Athemes Sydney affected 2.56 semver Not specified

References

ReferenceSourceLinkTags
research.cleantalk.org/cve-2025-8999 [email protected] research.cleantalk.org
themes.trac.wordpress.org/browser/sydney/2.55/inc/classes/class-sydney-modules.php [email protected] themes.trac.wordpress.org
www.wordfence.com/threat-intel/vulnerabilities/id/965582c6-a52e-4f88-81ef-b5dd7... [email protected] www.wordfence.com
themes.trac.wordpress.org/browser/sydney/2.55/inc/modules/class-sydney-modules.php [email protected] themes.trac.wordpress.org
themes.trac.wordpress.org/changeset/288374 [email protected] themes.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: Dmitrii Ignatyev (en)

Additional Advisory Data

SourceTimeEvent
CNA2025-08-15T15:11:05.000ZVendor Notified
CNA2025-09-16T00:00:00.000ZDisclosed
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