CVE-2026-2840 | onlineoptimisation Email Encoder Plugin up to 2.4.4 on WordPress eeb_mailto cross site scripting

VDB-357925 · CVE-2026-2840 · GCVE-0-2026-2840 ONLINEOPTIMISATION EMAIL ENCODER PLUGIN UP TO 2.4.4 ON WORDPRESS EEB_MAILTO CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 4.9 $0-$5k 2.66+ 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. Productinfo Type WordPress Plugin Vendor onlineoptimisation Name Email Encoder Plugin Version 2.4.0 2.4.1 2.4.2 2.4.3 2.4.4 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 Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock 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: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock 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: 99:E98:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸