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Medium severity · published Oct 23, 2026
CVE-2026-115754
serialize-javascript 7.0.1 before 7.1.3 XSS via unescaped </script in function body
New
4.7
CVSS
0.2%
EPSS
No
On KEV
Description
serialize-javascript from 7.0.1 before 7.1.3 contains a cross-site scripting vulnerability that allows attackers to break out of HTML script elements by ending serialized function source text with an unescaped </script. Attackers controlling a function's source via a spoofed toString() can combine surrounding output delimiters and later values to inject live markup such as img onerror handlers.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
None
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.2% · higher than 14% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SE
serialize-javascript · yahoo
7.0.1 before 7.1.3 · source: vendor
Affected product
SE
serialize-javascript
yahoo
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-115754
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-115754
github.com
https://github.com/yahoo/serialize-javascript/commit/2864b3c6260a3bfd52d2db3e70d1a079de108a61
github.com
https://github.com/yahoo/serialize-javascript/pull/235
github.com
https://github.com/yahoo/serialize-javascript/releases/tag/v7.1.3
github.com
https://github.com/yahoo/serialize-javascript/security/advisories/GHSA-m5mm-p8h7-m29v
www.vulncheck.com
https://www.vulncheck.com/advisories/serialize-javascript-7.0.1-before-7.1.3-xss-via-unescaped-script-in-function-body
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2.1
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Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script at the end of a serialized function body