CVE-2026-40451 | DeepL Chrome Browser Extension 1.22.x cross site scripting (GHSA-4x2r-q3p9-xhx4 / EUVD-2026-24605)

VDB-358757 · CVE-2026-40451 · GHSA-4X2R-Q3P9-XHX4 DEEPL CHROME BROWSER EXTENSION 1.22.X CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.1 $0-$5k 2.32+ Summaryinfo A vulnerability was found in DeepL Chrome Browser Extension 1.22.x. It has been rated as problematic. This vulnerability affects unknown code. The manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-40451. The attack is possible to be carried out remotely. No exploit exists. Detailsinfo A vulnerability was found in DeepL Chrome Browser Extension 1.22.x. It has been rated as problematic. This issue affects an unknown function. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to 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. Impacted is integrity. The summary by CVE is: DeepL Chrome browser extension versions from v1.22.0 to v.1.23.0 contain a cross-site scripting vulnerability, which allows an attacker to execute arbitrary script in a user's browser, and inject malicious HTML into web pages viewed by the user. The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-40451 since 04/13/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly 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. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-24605). Productinfo Vendor DeepL Name Chrome Browser Extension Version 1.22.x CPE 2.3info 🔒 CPE 2.2info 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA CVSS-B Score: 🔒 CNA CVSS-BT Score: 🔒 CNA Vector: 🔒 CVSSv3info VulDB Meta Base Score: 5.2 VulDB Meta Temp Score: 5.1 VulDB Base Score: 4.3 VulDB Temp Score: 4.2 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 6.1 CNA Vector (jpcert): 🔒 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 04/13/2026 CVE reserved 04/22/2026 +9 days Advisory disclosed 04/22/2026 +0 days VulDB entry created 04/22/2026 +0 days VulDB entry last update Sourcesinfo Advisory: GHSA-4x2r-q3p9-xhx4 Status: Not defined CVE: CVE-2026-40451 (🔒) GCVE (CVE): GCVE-0-2026-40451 GCVE (VulDB): GCVE-100-358757 EUVD: 🔒 Entryinfo Created: 04/22/2026 07:30 Updated: 04/22/2026 09:06 Changes: 04/22/2026 07:30 (74), 04/22/2026 09:06 (1) Complete: 🔍 Cache ID: 99:E97:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸