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CVE-2026-23794 is a reflected cross-site scripting vulnerability in the Apache Syncope Enduser Login page, affecting the Syncope UI component in versions 3.0 through 3.0.15 and 4.0 through 4.0.3. The flaw allows attacker-controlled input delivered through a crafted link to be reflected by the login interface and executed in the victim’s browser. Exploitation requires convincing a legitimate user to follow the malicious link and then authenticate to the Enduser interface. Successful exploitation can expose the user’s credentials and compromise the integrity of the login session.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A reflected cross-site scripting vulnerability in the Apache Syncope login interface.
Reflected XSS in Apache Syncope Enduser login page that can be used to steal user credentials via a malicious link.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.