XSS in Lxsmnsyc Seroval
CVE-2026-116582
Seroval facilitates JavaScript value stringification, including complex structures beyond JSON.stringify capabilities. Prior to 1.0.0 and from 1.5.5 until 1.6.10, the JavaScript-output APIs serialize a RegExp source containing a less-than character without the escaping needed for an HTML script element. An application is affected when it builds regular expression syntax from untrusted input, serializes that RegExp through serialize, serializeAsync, crossSerialize, crossSerializeAsync, crossSerializeStream, Serializer, or compileJSON, and embeds the result in an HTML script element. The crafted source can terminate the element and execute script in the page received by another user. This issue is fixed in version 1.6.10.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.7 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Lxsmnsyc Seroval — versions < 1.0.0, >= 1.5.5, < 1.6.10
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-116582?
- CVE-2026-116582 is a medium-severity vulnerability in Lxsmnsyc Seroval, classified under Cross-site Scripting. CVSS score: 4.7/10. Published 2026-10-26.
- How severe is CVE-2026-116582?
- Medium severity. CVSS v3 base score is 4.7 out of 10.