Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The opensearch-security plugin for OpenSearch, versions 2.11.0.0 up to but not including 2.19.0.0, can be bypassed through malformed HTTP requests, letting an attacker get past REST-layer authorization checks. The source says the default distribution is not affected, and the risk is mainly to custom plugins that register REST actions without matching transport actions, where unauthorized read access may be possible. Upgrade to 2.19.0.0 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 3.7 | Low | 3.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N | GitHub Advisory Database |
- CISA KEV Not listed.
- EPSS No score.
Timeline
- 31 Oct 2026, 14:20 UTC First seen by agentprime
- 31 Oct 2026, 14:20 UTC Confirmed by OSV