Security readout for executives and security teams
Plain-English summary
CVE-2026-2587 is a critical Eclipse GlassFish flaw in server-side template rendering. If a vulnerable server processes attacker-controlled XML values, it may evaluate unsafe expressions and allow remote code execution. Successful compromise could affect confidentiality, integrity, and availability of the host. No source provided confirms active exploitation.
Executive priority
Treat as an urgent patching item for affected GlassFish environments. Remote code execution on application servers can lead to data theft, service disruption, and broader network compromise. Prioritize internet-facing or business-critical systems first.
Technical view
The issue is CWE-917: improper neutralization of Expression Language in a template context. Affected GlassFish ranges are 8.0.0–8.0.1, 7.1.0, and 7.0.0–7.0.25. Fixed versions are 8.0.2, 7.1.1, and 7.0.26. Impact for 5.1.0–6.2.5 is stated as unknown.
Likely exposure
Organizations running Eclipse GlassFish in the listed affected versions are potentially exposed, especially where applications accept or process user-supplied XML through the affected server-side rendering path. Exposure for GlassFish 5.1.0–6.2.5 cannot be confirmed from the provided sources.
Exploitation context
The CVSS vector indicates network reachability, low attack complexity, no privileges required, and user interaction required. The provided description says expression evaluation can lead to full host compromise. The CVE is not listed as KEV in the provided bundle, and no cited source confirms exploitation in the wild.
Researcher notes
Public details identify EL evaluation in XML-handling template rendering and provide fixed versions. The reference is an Eclipse CVE assignment issue. Evidence is incomplete for GlassFish 5.1.0–6.2.5 and for real-world exploitation status.
Mitigation direction
- Upgrade GlassFish 8.0.0–8.0.1 to 8.0.2.
- Upgrade GlassFish 7.1.0 to 7.1.1.
- Upgrade GlassFish 7.0.0–7.0.25 to 7.0.26.
- For 5.1.0–6.2.5, check Eclipse guidance because impact is unknown.
- Reduce exposure of GlassFish services until patched where business operations allow.
Validation and detection
- Inventory all Eclipse GlassFish instances and record exact versions.
- Identify applications processing XML or template-rendered user input on GlassFish.
- Confirm upgraded systems report fixed versions.
- Review vendor advisory updates for clarified 5.1.0–6.2.5 impact.
- Check monitoring for suspicious GlassFish behavior without attempting exploit reproduction.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-917: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2026-2587 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.6 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H2.86eclipseVulnerability scoring details
Base CVSS 3.1 score
9.6CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://gitlab.eclipse.org/security/cve-assignment/-/issues/86CVE reference, eclipse
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection')
Improper Neutralization of Special Elements used in an Expression Language Statement ('Expression Language Injection') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.