How severe is CVE-2026-23794?

CVE-2026-23794 has a CVSS score of 6.8/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2026-23794?

CVE-2026-23794 affects the following packages: org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui (Maven), org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui (Maven). Ecosystems affected: Maven.

How do I fix CVE-2026-23794?

Update org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui to 3.0.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-23794 is resolved across your whole dependency graph.

How do I detect CVE-2026-23794 in my Maven dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2026-23794 if there is no patch (or I can't update yet)?

Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Is CVE-2026-23794 actively exploited in the wild?

No public exploit code has been indexed for CVE-2026-23794 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2026-23794?

CVE-2026-23794 has an EPSS (Exploit Prediction Scoring System) score of 0.5%, placing it in the 45th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2026-23794?

CVE-2026-23794 is classified as Cross-site Scripting (XSS) (CWE-79). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was CVE-2026-23794 published, and has it been updated?

CVE-2026-23794 was published on February 3, 2026 and was last updated on October 28, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

☕

☕ Maven

Not in CISA KEV

MEDIUM severity

CVE-2026-23794 — syncope-client-idrepo-com…

MEDIUM

CVE-2026-23794 is a medium-severity (CVSS 6.8) Cross-site Scripting (XSS) vulnerability in org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui. A fix is available for org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui — see the affected versions and patch details below.

Apache Syncope: Reflected XSS on Enduser Login

Also known asGHSA-v84m-gfw5-hm2w

Published

Feb 3, 2026

Updated

Oct 28, 2026

Affected

2 pkgs

Patched

2 / 2

Exploits

None indexed

Exploitation data as of Nov 11, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-23794.

EPSS Exploitation Probability

via FIRST.org ↗

0.5%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs45th percentile — riskier than 45% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

2 pkgs affected

☕org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui☕org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

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.

Affected Packages

2 total 2 fixed

Ecosystem	Package	Vulnerable range	Fix
☕Maven	`org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui`	≥ 3.0.0&&< 3.0.16	3.0.16`org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui:3.0.16`
☕Maven	`org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui`	≥ 4.0.0&&< 4.0.4	4.0.4`org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui:4.0.4`

Affected Products

1 product · 2 configurations

Application

syncopeapache

≥ 4.0.0 && < 4.0.4

range

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.apache.syncope.client.idrepo:syncope-client-idrepo-common-ui to 3.0.16 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-23794 is resolved across your whole dependency graph.
Workarounds
Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

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.

O3 Security · Impact-Aware SCA

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CVSS Score

6.8/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

High

Integrity

None

Availability

None

Raw vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:N

CWE Classification

CWE-79Cross-site Scripting (XSS)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

Timeline

Disclosed

Feb 3, 2026

Last updated

Oct 28, 2026

Identifiers

CVE-2026-23794

GHSA-v84m-gfw5-hm2w

References

Advisorygithub.com · CVE 2026 23794.json Advisorylists.apache.org · 7h30ghqdsf3spl3h7gdmscxofrm8ygjo Advisorynvd.nist.gov · CVE 2026 23794 Webopenwall.com Webrepo.maven.apache.org · maven2 Packagegithub.com · syncope

Related vulnerabilities

Also affects syncope-client-idrepo-common-ui

This CVE is medium severity; 1 of 1 other CVE affecting syncope-client-idrepo-common-ui is rated as high or higher (top: high).

CVE-2024-38503

Same weakness: CWE-79

This CVE is medium severity; 5 of 7 other CVEs with CWE-79 are rated as high or higher (top: high).

CVE-2026-126075CVE-2026-126063CVE-2026-110802CVE-2026-123364CVE-2026-118670CVE-2026-88986CVE-2026-63197Browse all CWE-79

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 28, 2026