CVE-2026-52843: CWE-346: Origin Validation Error in lightpanda-io browser
Lightpanda browser versions prior to 0.2.9 have a vulnerability where fetch() and XMLHttpRequest APIs attach session cookies to all HTTP requests regardless of the specified credentials mode. This allows an attacker-controlled origin within a Lightpanda session to perform authenticated cross-origin requests against a victim origin. The issue is fixed in version 0.2.9.
AI Analysis
Technical Summary
CVE-2026-52843 is an origin validation error (CWE-346) in the Lightpanda headless browser. Before version 0.2.9, the browser's fetch() and XMLHttpRequest implementations ignored the credentials mode settings (such as omit, same-origin, include, and withCredentials) and always attached session cookies to outgoing HTTP requests. This behavior enables an attacker controlling an origin within a Lightpanda session to issue authenticated cross-origin requests to a victim origin, potentially leading to unauthorized actions or data exposure. The vulnerability is resolved in Lightpanda version 0.2.9.
Potential Impact
An attacker who can control an origin in a Lightpanda session can exploit this vulnerability to perform authenticated cross-origin requests using the victim's session cookies. This can lead to unauthorized access to sensitive data or actions performed on behalf of the victim origin. The CVSS score of 9.3 indicates a critical impact with high confidentiality and integrity consequences, no privileges required, and user interaction needed.
Mitigation Recommendations
Upgrade Lightpanda to version 0.2.9 or later, where this issue is fixed. No other mitigation is indicated or necessary as the vulnerability is resolved in the official fix.
CVE-2026-52843: CWE-346: Origin Validation Error in lightpanda-io browser
Description
Lightpanda browser versions prior to 0.2.9 have a vulnerability where fetch() and XMLHttpRequest APIs attach session cookies to all HTTP requests regardless of the specified credentials mode. This allows an attacker-controlled origin within a Lightpanda session to perform authenticated cross-origin requests against a victim origin. The issue is fixed in version 0.2.9.
CVSS v3.1
Score 9.3critical
Affected software
pkg:github/lightpanda-io/browserRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-52843 is an origin validation error (CWE-346) in the Lightpanda headless browser. Before version 0.2.9, the browser's fetch() and XMLHttpRequest implementations ignored the credentials mode settings (such as omit, same-origin, include, and withCredentials) and always attached session cookies to outgoing HTTP requests. This behavior enables an attacker controlling an origin within a Lightpanda session to issue authenticated cross-origin requests to a victim origin, potentially leading to unauthorized actions or data exposure. The vulnerability is resolved in Lightpanda version 0.2.9.
Potential Impact
An attacker who can control an origin in a Lightpanda session can exploit this vulnerability to perform authenticated cross-origin requests using the victim's session cookies. This can lead to unauthorized access to sensitive data or actions performed on behalf of the victim origin. The CVSS score of 9.3 indicates a critical impact with high confidentiality and integrity consequences, no privileges required, and user interaction needed.
Mitigation Recommendations
Upgrade Lightpanda to version 0.2.9 or later, where this issue is fixed. No other mitigation is indicated or necessary as the vulnerability is resolved in the official fix.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-06-08T18:41:27.724Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a57b64268715ace430b3857
Added to database: 07/15/2026, 16:33:06 UTC
Last enriched: 07/15/2026, 16:47:32 UTC
Last updated: 07/15/2026, 16:47:32 UTC
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.