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Medium, CVSS 6.8

Apache Syncope: Reflected XSS on Enduser Login

CVE-2026-23794GHSA-v84m-gfw5-hm2w

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui 4.0.4, 3.0.16), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

  • GitHub Advisory Database and maintainer security advisories on GitHub

    GitHub-reviewed advisory GHSA-v84m-gfw5-hm2w lists affected ranges: Maven org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui >=3.0.0 =4.0.0 <4.0.4

    VerifiedObserved Structured GitHub Advisory Database record (type=reviewed) from the GitHub REST API.

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
6.8 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N
EPSS
  • CVE-2026-23794: 0.52% estimated exploitation activity in the next 30 days; percentile 44.51 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Reflected XSS in Apache Syncope's Enduser Login page. An attacker that tricks a legitimate user into clicking a malicious link and logging in to Syncope Enduser could steal that user's credentials. This issue affects Apache Syncope: from 3.0 through 3.0.15, from 4.0 through 4.0.3. Users are recommended to upgrade to version 3.0.16 / 4.0.4, which fix this issue.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-v84m-gfw5-hm2w

Agent brief

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# Patch Next advisory brief: CVE-2026-23794

Advisory: Apache Syncope: Reflected XSS on Enduser Login
IDs: CVE-2026-23794, GHSA-v84m-gfw5-hm2w
Record: https://patchnext.com/advisories/cve-2026-23794 (revision 1, source checked 26 Oct 2026, 16:44 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 6.8)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui 4.0.4, 3.0.16. A vendor fix does not mean a deployment is fixed.

## Affected components
- Maven org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui: affected >= 3.0.0, < 3.0.16; >= 4.0.0, < 4.0.4; fixed in 3.0.16, 4.0.4

## Suggested inspection (read-only)
- Maven org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-v84m-gfw5-hm2w (GitHub-reviewed advisory GHSA-v84m-gfw5-hm2w lists affected ranges: Maven org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui >=3.0.0 =4.0.0 <4.0.4)

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