CVE-2026-2587: CWE-917 Improper neutralization of special elements used in an expression language statement ('expression language injection') in Eclipse Foundation Eclipse Glassfish
CVE-2026-2587 is a critical remote code execution vulnerability in Eclipse Glassfish affecting versions up to 8. 0. 0. It arises from improper neutralization of special elements in the server-side template rendering mechanism, specifically in the Glassfish gadget handler processing . xml files. User-supplied input is evaluated as Expression Language (EL) expressions without proper sanitization, allowing attackers to execute arbitrary code on the server. This can lead to full system compromise, including data access, command execution, persistence, and lateral movement. No official patch or remediation guidance is currently available from the vendor. The vulnerability has a CVSS score of 9. 6, indicating a critical severity level.
AI Analysis
Technical Summary
CVE-2026-2587 is a critical vulnerability in Eclipse Glassfish's server-side template rendering mechanism used by the gadget handler. The vulnerability stems from improper neutralization of special elements in Expression Language (EL) statements processed within .xml files. Unsanitized user input is evaluated as EL expressions, enabling remote attackers to execute arbitrary code on the underlying host. This can result in full system compromise, including reading/modifying data, executing commands, persistence, and lateral movement. The vulnerability affects versions up to 8.0.0. No official fix or patch has been published by the Eclipse Foundation as of the published date.
Potential Impact
Successful exploitation of this vulnerability allows remote attackers to execute arbitrary code on the affected server without authentication. This leads to complete compromise of the host, including unauthorized data access, modification, command execution, establishing persistence, and moving laterally within the network. The CVSS score of 9.6 reflects the critical nature and high impact of this vulnerability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, organizations should consider disabling or restricting access to the vulnerable Glassfish gadget handler component if possible. Monitor for any updates from the Eclipse Foundation regarding patches or official mitigations.
CVE-2026-2587: CWE-917 Improper neutralization of special elements used in an expression language statement ('expression language injection') in Eclipse Foundation Eclipse Glassfish
Description
CVE-2026-2587 is a critical remote code execution vulnerability in Eclipse Glassfish affecting versions up to 8. 0. 0. It arises from improper neutralization of special elements in the server-side template rendering mechanism, specifically in the Glassfish gadget handler processing . xml files. User-supplied input is evaluated as Expression Language (EL) expressions without proper sanitization, allowing attackers to execute arbitrary code on the server. This can lead to full system compromise, including data access, command execution, persistence, and lateral movement. No official patch or remediation guidance is currently available from the vendor. The vulnerability has a CVSS score of 9. 6, indicating a critical severity level.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-2587 is a critical vulnerability in Eclipse Glassfish's server-side template rendering mechanism used by the gadget handler. The vulnerability stems from improper neutralization of special elements in Expression Language (EL) statements processed within .xml files. Unsanitized user input is evaluated as EL expressions, enabling remote attackers to execute arbitrary code on the underlying host. This can result in full system compromise, including reading/modifying data, executing commands, persistence, and lateral movement. The vulnerability affects versions up to 8.0.0. No official fix or patch has been published by the Eclipse Foundation as of the published date.
Potential Impact
Successful exploitation of this vulnerability allows remote attackers to execute arbitrary code on the affected server without authentication. This leads to complete compromise of the host, including unauthorized data access, modification, command execution, establishing persistence, and moving laterally within the network. The CVSS score of 9.6 reflects the critical nature and high impact of this vulnerability.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, organizations should consider disabling or restricting access to the vulnerable Glassfish gadget handler component if possible. Monitor for any updates from the Eclipse Foundation regarding patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- eclipse
- Date Reserved
- 2026-02-16T14:14:23.896Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a0c757aec166c07b0b4029f
Added to database: 5/19/2026, 2:36:42 PM
Last enriched: 5/19/2026, 2:51:58 PM
Last updated: 5/19/2026, 3:40:17 PM
Views: 6
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.