# OpenAM Unauthenticated Session Hijacking via Information Exposure in CDCServlet

Advisory record · `GHSA-r9pv-5rpp-vm8g`

- **Identifiers:** `GHSA-r9pv-5rpp-vm8g` · `CVE-2026-45049`
- **State:** Confirmed
- **Severity:** CVSS 8.3 High
- **Critical:** No
- **Weakness (CWE):** [CWE-201](https://cwe.mitre.org/data/definitions/201.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md)
- **Published:** 23 Jun 2026
- **Updated:** 28 Oct 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 23 Jun 2026, 17:33 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.openidentityplatform.openam:openam-federation` (Maven): affected `<16.1.1`; fixed in `16.1.1`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> OpenAM openam-federation versions before 16.1.1 are affected. An attacker who can get a logged-in user to visit a crafted URL can receive that user's raw session token, which may allow session hijacking; the source notes that exploitation depends on a non-default configuration with the Cross-Domain Single Sign-On servlet enabled. Upgrade to version 16.1.1.

Written 2 Nov 2026.

## 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

- 8.3 High, CVSS 3.1: `CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0033, the 26th percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 29 Oct 2026, 21:13 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-45049)
- 29 Oct 2026, 22:17 UTC: [Confirmed by NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-45049)
- 31 Oct 2026, 14:16 UTC: First seen by agentprime
- 31 Oct 2026, 14:16 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-r9pv-5rpp-vm8g)

## Sources

- [GitHub Advisory Database: GHSA-r9pv-5rpp-vm8g](https://github.com/advisories/GHSA-r9pv-5rpp-vm8g)
- [OSV: GHSA-r9pv-5rpp-vm8g](https://osv.dev/vulnerability/GHSA-r9pv-5rpp-vm8g)
- <https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-r9pv-5rpp-vm8g>
- <https://github.com/OpenIdentityPlatform/OpenAM/commit/bda647f8540d8fb28aaaed716914692678c5a0a7>
- <https://github.com/OpenIdentityPlatform/OpenAM>
- <https://github.com/OpenIdentityPlatform/OpenAM/releases/tag/16.1.1>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-r9pv-5rpp-vm8g>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-r9pv-5rpp-vm8g/>. Everything for agents: <https://agentprime.io/llms.txt>.