devsabbirahmed Firebase Support & Chat Management Plugin up to 3.1.1 on WordPress POST Parameter acb_firebase_auth user_email privileges management

Summaryinfo

A vulnerability was found in devsabbirahmed Firebase Support & Chat Management Plugin up to 3.1.1 on WordPress. It has been rated as critical. Affected by this issue is the function acb_firebase_auth of the component POST Parameter Handler. Performing a manipulation of the argument user_email results in privileges management. This vulnerability was named CVE-2026-8787. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in devsabbirahmed Firebase Support & Chat Management Plugin up to 3.1.1 on WordPress. It has been classified as critical. This affects the function acb_firebase_auth of the component POST Parameter Handler. The manipulation of the argument user_email with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

The Firebase Support & Chat Management plugin for WordPress is vulnerable to privilege escalation in all versions up to, and including, 3.1.1. This is due to the `firebase_auth()` function authenticating the request as the WordPress user whose email is supplied in the `user_email` POST parameter without verifying ownership of that email (no Firebase ID token signature/issuer/audience verification). This makes it possible for authenticated attackers, with Subscriber-level access and above, to log in as an arbitrary existing user — including an Administrator — by submitting that user's email address to the `acb_firebase_auth` AJAX action, resulting in full account takeover.

The weakness was presented by Farrukh Ziyaev. It is possible to read the advisory at wordfence.com. This vulnerability is uniquely identified as CVE-2026-8787 since 05/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 05/27/2026). The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

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

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Chat Software

Vendor

• devsabbirahmed

Name

• Firebase Support & Chat Management Plugin

Version

• 3.1.0
• 3.1.1

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Discussion