Privileged blind SSRF via unvalidated texture URL
Published May 11, 2026 · Updated May 11, 2026
Server-side request forgery in Geyser before 2.9.3 allows remote authenticated users to make arbitrary HTTP GET requests. The player-head texture handler decodes the minecraft:profile textures property and forwards its SKIN.url value for resolution without sufficient destination validation. Exploitation requires a Bedrock client with permission to run /give and provides blind request capability without returning response data.
Summary
What happened
Server-side request forgery in Geyser before 2.9.3 allows remote authenticated users to make arbitrary HTTP GET requests. The player-head texture handler decodes the minecraft:profile textures property and forwards its SKIN.url value for resolution without sufficient destination validation. Exploitation requires a Bedrock client with permission to run /give and provides blind request capability without returning response data.
The record
- CVE
- CVE-2026-42188
- Published
- May 11, 2026
- Updated
- May 11, 2026
- Vendor
- GeyserMC
- Product
- Geyser
- Classifications
- CWE-918, T1046
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- May 11, 2026CVE publishedPublication date reported by the CVE source.
- May 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=< 2.9.3
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- Geyser player-head texture SSRF proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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