Case-Themes Case Theme User up to 1.0.3 on WordPress facebook_ajax_login_callback authentication bypass

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.4$0-$5k0.00

Summaryinfo

A vulnerability categorized as critical has been discovered in Case-Themes Case Theme User up to 1.0.3 on WordPress. The impacted element is the function facebook_ajax_login_callback. Executing a manipulation can lead to authentication bypass. This vulnerability is handled as CVE-2025-5821. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability has been found in Case-Themes Case Theme User up to 1.0.3 on WordPress and classified as critical. This vulnerability affects the function facebook_ajax_login_callback. The manipulation with an unknown input leads to a authentication bypass vulnerability. The CWE definition for the vulnerability is CWE-288. A product requires authentication, but the product has an alternate path or channel that does not require authentication. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

The Case Theme User plugin for WordPress is vulnerable to Authentication Bypass in all versions up to, and including, 1.0.3. This is due to the plugin not properly logging a user in with the data that was previously verified through the facebook_ajax_login_callback(). This makes it possible for unauthenticated attackers to log in as administrative users, as long as they have an existing account on the site, and access to the administrative user's email.

The weakness was released by Friderika Baranyai. The advisory is shared for download at wordfence.com. This vulnerability was named CVE-2025-5821 since 06/06/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/23/2025).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-25634). Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 9.8
CNA Vector (Wordfence): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Authentication bypass
CWE: CWE-288 / CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

06/06/2025 CVE reserved
08/23/2025 +78 days Advisory disclosed
08/23/2025 +0 days VulDB entry created
08/23/2025 +0 days VulDB entry last update

Sourcesinfo

Advisory: wordfence.com
Researcher: Friderika Baranyai
Status: Not defined

CVE: CVE-2025-5821 (🔒)
GCVE (CVE): GCVE-0-2025-5821
GCVE (VulDB): GCVE-100-321196
EUVD: 🔒

Entryinfo

Created: 08/23/2025 10:12
Updated: 08/23/2025 14:04
Changes: 08/23/2025 10:12 (65), 08/23/2025 14:04 (1)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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