onlineoptimisation Email Encoder Plugin up to 2.4.4 on WordPress eeb_mailto cross site scripting

CVSS Meta Temp Score
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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.
4.9$0-$5k4.90-

Summaryinfo

A vulnerability, which was classified as problematic, has been found in onlineoptimisation Email Encoder Plugin up to 2.4.4 on WordPress. The impacted element is the function eeb_mailto. This manipulation causes cross site scripting. This vulnerability is registered as CVE-2026-2840. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability has been found in onlineoptimisation Email Encoder Plugin up to 2.4.4 on WordPress and classified as problematic. Affected by this vulnerability is the function eeb_mailto. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

The Email Encoder – Protect Email Addresses and Phone Numbers plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'eeb_mailto' shortcode in all versions up to, and including, 2.4.4 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

The weakness was published by Athiwat Tiprasaharn. The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-2840 since 02/19/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

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

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Productinfo

Type

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.9

VulDB Base Score: 3.5
VulDB Temp Score: 3.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.4
CNA Vector (Wordfence): 🔒

CVSSv2info

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

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
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

02/19/2026 CVE reserved
04/16/2026 +55 days Advisory disclosed
04/16/2026 +0 days VulDB entry created
04/16/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: wordfence.com
Researcher: Athiwat Tiprasaharn
Status: Not defined

CVE: CVE-2026-2840 (🔒)
GCVE (CVE): GCVE-0-2026-2840
GCVE (VulDB): GCVE-100-357925

Entryinfo

Created: 04/16/2026 16:47
Changes: 04/16/2026 16:47 (65)
Complete: 🔍
Cache ID: 216::103

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