CVE-2026-42188: CWE-918: Server-Side Request Forgery (SSRF) in GeyserMC Geyser
A server-side request forgery (SSRF) vulnerability exists in GeyserMC Geyser versions prior to 2. 9. 3. This flaw allows an attacker to supply a crafted Base64-encoded skin texture URL via the /give command, causing the server to make arbitrary HTTP GET requests to attacker-controlled or internal endpoints. The vulnerability arises from improper URL validation in handling Bedrock player head texture data. It is fixed in version 2. 9. 3. The CVSS score is low (2. 4), indicating limited impact.
AI Analysis
Technical Summary
GeyserMC Geyser, a bridge between Minecraft: Bedrock Edition and Java Edition, has an SSRF vulnerability (CWE-918) in versions before 2.9.3. The issue occurs because the server processes a Base64-encoded skin texture URL from the /give command without proper validation, enabling an attacker to trigger arbitrary HTTP GET requests from the server to external or internal endpoints. This vulnerability is resolved in version 2.9.3. The CVSS 3.1 base score is 2.4, reflecting low severity with limited confidentiality impact and no integrity or availability impact.
Potential Impact
An attacker with high privileges and user interaction can cause the server to make arbitrary HTTP GET requests, potentially exposing internal network resources or attacker-controlled endpoints. The impact is limited to information disclosure (confidentiality) with no direct integrity or availability effects. No known exploitation in the wild has been reported.
Mitigation Recommendations
Upgrade GeyserMC Geyser to version 2.9.3 or later, where this SSRF vulnerability is fixed. Since the vendor advisory indicates the issue is resolved in 2.9.3, applying this official fix is the recommended remediation. No additional mitigations are specified.
CVE-2026-42188: CWE-918: Server-Side Request Forgery (SSRF) in GeyserMC Geyser
Description
A server-side request forgery (SSRF) vulnerability exists in GeyserMC Geyser versions prior to 2. 9. 3. This flaw allows an attacker to supply a crafted Base64-encoded skin texture URL via the /give command, causing the server to make arbitrary HTTP GET requests to attacker-controlled or internal endpoints. The vulnerability arises from improper URL validation in handling Bedrock player head texture data. It is fixed in version 2. 9. 3. The CVSS score is low (2. 4), indicating limited impact.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
GeyserMC Geyser, a bridge between Minecraft: Bedrock Edition and Java Edition, has an SSRF vulnerability (CWE-918) in versions before 2.9.3. The issue occurs because the server processes a Base64-encoded skin texture URL from the /give command without proper validation, enabling an attacker to trigger arbitrary HTTP GET requests from the server to external or internal endpoints. This vulnerability is resolved in version 2.9.3. The CVSS 3.1 base score is 2.4, reflecting low severity with limited confidentiality impact and no integrity or availability impact.
Potential Impact
An attacker with high privileges and user interaction can cause the server to make arbitrary HTTP GET requests, potentially exposing internal network resources or attacker-controlled endpoints. The impact is limited to information disclosure (confidentiality) with no direct integrity or availability effects. No known exploitation in the wild has been reported.
Mitigation Recommendations
Upgrade GeyserMC Geyser to version 2.9.3 or later, where this SSRF vulnerability is fixed. Since the vendor advisory indicates the issue is resolved in 2.9.3, applying this official fix is the recommended remediation. No additional mitigations are specified.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-25T01:53:21.583Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a028746cbff5d86108b50d9
Added to database: 5/12/2026, 1:49:58 AM
Last enriched: 5/12/2026, 1:52:42 AM
Last updated: 5/12/2026, 2:53:45 AM
Views: 1
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.
External Links
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.