CVE-2026-5429 | Amazon AWS Kiro IDE up to 0.8.139 Kiro Agent Webview cross site scripting

VDB-355028 · CVE-2026-5429 · EUVD-2026-18519 AMAZON AWS KIRO IDE UP TO 0.8.139 KIRO AGENT WEBVIEW CROSS SITE SCRIPTING HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 5.5 $0-$5k 1.10 Summaryinfo A vulnerability, which was classified as problematic, was found in Amazon AWS Kiro IDE up to 0.8.139. This vulnerability affects unknown code of the component Kiro Agent Webview. Such manipulation leads to cross site scripting. This vulnerability is listed as CVE-2026-5429. The attack must be carried out locally. There is no available exploit. You should upgrade the affected component. Detailsinfo A vulnerability was found in Amazon AWS Kiro IDE up to 0.8.139 and classified as problematic. Affected by this issue is some unknown functionality of the component Kiro Agent Webview. 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. CVE summarizes: Unsanitized input during web page generation in the Kiro Agent webview in Kiro IDE before version 0.8.140 allows a remote unauthenticated threat actor to execute arbitrary code via a potentially damaging crafted color theme name when a local user opens the workspace. This issue requires the user to trust the workspace when prompted. To remediate this issue, users should upgrade to version 0.8.140. The advisory is shared for download at aws.amazon.com. This vulnerability is handled as CVE-2026-5429 since 04/02/2026. The exploitation is known to be easy. The attack needs to be approached locally. No form of authentication is required for exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1059.007. Upgrading to version 0.8.140 eliminates this vulnerability. The upgrade is hosted for download at kiro.dev. The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-18519). Productinfo Vendor Amazon Name AWS Kiro IDE Version 0.8.139 License commercial 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: 5.5 VulDB Meta Temp Score: 5.5 VulDB Base Score: 3.3 VulDB Temp Score: 3.2 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 7.8 CNA Vector (AMZN): 🔒 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: Partially Local: Yes Remote: Partially 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: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: AWS Kiro IDE 0.8.140 Timelineinfo 04/02/2026 CVE reserved 04/02/2026 +0 days VulDB entry created 04/03/2026 +0 days Advisory disclosed 04/03/2026 +0 days VulDB entry last update Sourcesinfo Advisory: aws.amazon.com Status: Confirmed CVE: CVE-2026-5429 (🔒) GCVE (CVE): GCVE-0-2026-5429 GCVE (VulDB): GCVE-100-355028 EUVD: 🔒 Entryinfo Created: 04/03/2026 00:06 Updated: 04/03/2026 01:54 Changes: 04/03/2026 00:06 (77), 04/03/2026 01:54 (1) Complete: 🔍 Cache ID: 99:F8F:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸