Quick answers
- Is CVE-2026-115289 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-115289 being exploited in the wild.
- How severe is CVE-2026-115289?
- Medium severity, with a CVSS score of 4.3, published 3 November 2026.
- Which products and versions are affected?
- Elastic Apm Server 8.0.0 through 8.19.23, 9.0.0 through 9.4.8, 9.5.0 through 9.5.5.
- Is there a fix for CVE-2026-115289?
- Yes: fixed in APM Server 8.19.24, 9.4.9, 9.5.6. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-115289 attacked?
- It is attacked over the network, in a hosted service.
- Am I affected by CVE-2026-115289?
- Check whether you run Elastic Apm Server at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
How to fix
- Fixed in: APM Server 8.19.24, 9.4.9, 9.5.6
Technical details
A use-of-multiple-resources-with-duplicate-identifier flaw (CWE-694) in APM Server's central agent configuration handling allows cache collisions when retrieving configuration through Kibana. An authenticated APM agent can receive cached configuration belonging to a different service until the cache expires. The vulnerability requires APM agent authentication and central configuration to be enabled; the attacker gains visibility into configuration of other services or causes services to run with mismatched configuration.
Affected products
- Elastic APM Server 8.0.0 through 8.19.23, 9.0.0 through 9.4.8, 9.5.0 through 9.5.5
Timeline
- 2026-11-03: disclosed