CVE-2026-42150: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in WeblateOrg wlc
CVE-2026-42150 is a cross-site scripting (XSS) vulnerability in the Weblate command-line client (wlc) prior to version 2.0.0. The vulnerability arises because the HTML output format embeds API response data into HTML without proper escaping, which can lead to XSS when the output is viewed in a browser. This issue has been addressed in version 2.0.0 of wlc. The vulnerability has a medium severity with a CVSS score of 5.1.
AI Analysis
Technical Summary
The wlc tool, a command-line client for Weblate's REST API, prior to version 2.0.0, improperly neutralizes input when generating HTML output. Specifically, it embeds API response data directly into HTML without escaping, resulting in a cross-site scripting (CWE-79) vulnerability. This can allow an attacker to inject malicious scripts that execute when the HTML output is rendered in a browser. The vulnerability was fixed in wlc version 2.0.0.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the user's browser when viewing the HTML output generated by wlc. This could lead to limited confidentiality, integrity, and availability impacts as indicated by the CVSS vector (C:L/I:L/A:L). However, exploitation requires user interaction (rendering the HTML output in a browser) and high privileges to run the client with user interaction, reducing the attack surface.
Mitigation Recommendations
Upgrade wlc to version 2.0.0 or later, where the vulnerability has been patched. Since the vendor advisory confirms the fix in version 2.0.0, applying this update fully mitigates the issue. No additional mitigations are specifically recommended beyond upgrading.
CVE-2026-42150: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in WeblateOrg wlc
Description
CVE-2026-42150 is a cross-site scripting (XSS) vulnerability in the Weblate command-line client (wlc) prior to version 2.0.0. The vulnerability arises because the HTML output format embeds API response data into HTML without proper escaping, which can lead to XSS when the output is viewed in a browser. This issue has been addressed in version 2.0.0 of wlc. The vulnerability has a medium severity with a CVSS score of 5.1.
CVSS v3.1
Score 5.1medium
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The wlc tool, a command-line client for Weblate's REST API, prior to version 2.0.0, improperly neutralizes input when generating HTML output. Specifically, it embeds API response data directly into HTML without escaping, resulting in a cross-site scripting (CWE-79) vulnerability. This can allow an attacker to inject malicious scripts that execute when the HTML output is rendered in a browser. The vulnerability was fixed in wlc version 2.0.0.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary scripts in the context of the user's browser when viewing the HTML output generated by wlc. This could lead to limited confidentiality, integrity, and availability impacts as indicated by the CVSS vector (C:L/I:L/A:L). However, exploitation requires user interaction (rendering the HTML output in a browser) and high privileges to run the client with user interaction, reducing the attack surface.
Mitigation Recommendations
Upgrade wlc to version 2.0.0 or later, where the vulnerability has been patched. Since the vendor advisory confirms the fix in version 2.0.0, applying this update fully mitigates the issue. No additional mitigations are specifically recommended beyond upgrading.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-24T17:15:21.835Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69fd5dbdcbff5d86108b6451
Added to database: 05/08/2026, 03:51:25 UTC
Last enriched: 05/15/2026, 10:53:08 UTC
Last updated: 07/31/2026, 19:22:58 UTC
Views: 63
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