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CVE-2026-87758

Apache TomEE: Missing TLS hostname verification in ejbds client connections

Exploited
No known exploitation
Fix
Fixed in 10.0.0-M1, 10.3.0, 11.0.0-M2
Who is exposed
Not reported

Do first: Upgrade to a fixed version: 10.0.0-M1, 10.3.0, 11.0.0-M2.

Published
Last modified
Reference
Last checked
10/100 · provisional
None on Exploit-DB, Metasploit or GitHub

Summary

Apache TomEE's remote EJB client does not verify that the server's hostname matches its TLS certificate. An attacker who can intercept network traffic between the client and server could impersonate the server and read or modify the traffic, including credentials and invocation data.

Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.

Read the original description

The remote EJB client does not verify that the hostname of the server it connects to matches the server's TLS certificate. An attacker able to intercept network traffic between an EJB client and server can impersonate the server and read or modify the traffic, including credentials and invocation data. Users are recommended to upgrade to version 10.3.0 or 11.0.0-M2, which fix the issue.

cve.now Index

10Pcve.now Index 10 of 100 · methodology v3 · provisional
  • Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
  • Exposure?/25Unknown. No advisory context yet
  • Reach10/20Affects Maven packages
  • Severity?/10Unknown. No CVSS score or vendor rating
  • No patch0/5No signal

What would change the score

  • Would score about 65 if added to CISA KEV
  • Would score about 60 if CISA's SSVC rates exploitation active
  • Would score about 32 if advisories confirm default setups are exposed

How the score works · Rankings

What to do

  • Upgrade to a fixed version: 10.0.0-M1, 10.3.0, 11.0.0-M2.

Check your systems with an agent

Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.

Check whether my systems are affected by CVE-2026-87758 (Apache TomEE: Missing TLS hostname verification in ejbds client connections), using the cve.now data below.

Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.

What cve.now has for CVE-2026-87758 (entry last updated 2026-11-10):
Affected:
- Maven package org.apache.openejb:openejb-client: from 4.0.0-beta-1, through 4.7.5
- Maven package org.apache.tomee:openejb-client: from 7.0.0-M1, fixed in 10.0.0-M1; from 10.0.0-M1, fixed in 10.3.0; from 11.0.0-M1, fixed in 11.0.0-M2
Fixed versions: 10.0.0-M1, 10.3.0, 11.0.0-M2.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-87758 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-87758 only. If you also check another CVE, look up its own KEV status; never assume it from this one.

How to check:
- Packages (Maven): find every lockfile in each project and run check_stack from the cve.now MCP server on each one. Compare the resolved versions, not the ranges a manifest declares, with the affected versions above. Include transitive dependencies.

Verify against the linked advisories before concluding, and cite the date you read each one:
- https://lists.apache.org/thread/nzy4n8rmv4zl5wzdz0v0kwrj62tjrd7z
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.

Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.

Entry: https://cve.now/CVE-2026-87758
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example get_vulnerability with id CVE-2026-87758.

Timeline

  1. CVE published
  2. First seen by cve.now

Affected versions

Evidence 3

Vendor advisory · 1

Establishes: Affected and fixed versions.

  1. Advisory

CVE record · 2

Establishes: The identifier and description.

  1. Record
  2. Record

Corrections

None so far.

Something wrong on this page? Report an error. Every fix is listed here.

Questions about CVE-2026-87758

Is CVE-2026-87758 being exploited?

It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data

Which versions are affected by CVE-2026-87758?

org.apache.openejb:openejb-client (Maven): from 4.0.0-beta-1 through 4.7.5. org.apache.tomee:openejb-client (Maven): from 7.0.0-M1 before 10.0.0-M1; from 10.0.0-M1 before 10.3.0; from 11.0.0-M1 before 11.0.0-M2.Source: cve.now feed data

How do I fix CVE-2026-87758?

Upgrade to a fixed version: 10.0.0-M1, 10.3.0, 11.0.0-M2.Source: cve.now feed data

Sources

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