# Apache Syncope: Reflected XSS on Enduser Login

Advisory record · `GHSA-v84m-gfw5-hm2w`

- **Identifiers:** `GHSA-v84m-gfw5-hm2w` · `CVE-2026-23794`
- **State:** Confirmed
- **Severity:** CVSS 6.8 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-79](https://cwe.mitre.org/data/definitions/79.html)
- **Tags:** [Cross-site scripting (XSS)](https://agentprime.io/advisories/tag/xss.md)
- **Published:** 3 Feb 2026
- **Updated:** 3 Feb 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 3 Feb 2026, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui` (Maven): affected `>=3.0.0, <3.0.16 || >=4.0.0, <4.0.4`; fixed in `3.0.16`, `4.0.4`

## Machine-written summary

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

> Apache Syncope's client-idrepo-common-ui package is vulnerable to reflected cross-site scripting on the Enduser Login page in versions 3.0.0 through 3.0.15 and 4.0.0 through 4.0.3. An attacker who tricks a user into clicking a malicious link and logging in to Syncope Enduser could steal that user's credentials. Users should upgrade to version 3.0.16 or 4.0.4.

Written 7 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

- 6.8 Medium, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0052, the 45th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:09 UTC: First seen by agentprime
- 31 Oct 2026, 15:09 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-v84m-gfw5-hm2w)

## Sources

- [GitHub Advisory Database: GHSA-v84m-gfw5-hm2w](https://github.com/advisories/GHSA-v84m-gfw5-hm2w)
- [OSV: GHSA-v84m-gfw5-hm2w](https://osv.dev/vulnerability/GHSA-v84m-gfw5-hm2w)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-23794>
- <https://github.com/apache/syncope>
- <https://lists.apache.org/thread/7h30ghqdsf3spl3h7gdmscxofrm8ygjo>
- <http://www.openwall.com/lists/oss-security/2026/02/02/1>

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-v84m-gfw5-hm2w>, 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-v84m-gfw5-hm2w/>. Everything for agents: <https://agentprime.io/llms.txt>.