Serialize JavaScript: Cross-site scripting (XSS) via unescaped </script at the end of a serialized function body

[ Description ]Official description

Serialize JavaScript serializes JavaScript values to a superset of JSON that includes regular expressions and functions. Prior to 7.1.3, the function-source escaping logic does not neutralize a bare closing-script prefix when attacker-influenced function source text ends exactly at that prefix. Because each function body is escaped independently, a delimiter supplied by surrounding serialized output can terminate an HTML script element, and a later serialized value supplies injected markup that becomes a live element in the page. Exploitation requires control of a serialized function's source text, such as through a spoofed toString(). This issue is fixed in version 7.1.3.

[ Fixes ]Fixes and patches

• serialize-javascript 7.1.3Fixed version · GitHub Advisories · npm package serialize-javascript: upgrade to 7.1.3 or later (affected < 7.1.3)

[ Packages ]Affected open-source packages

• serialize-javascript npmAffected < 7.1.3 · fixed in 7.1.3 · GHSA-m5mm-p8h7-m29v

[ References ]References

• github.com/yahoo/serialize-javascript/commit/2864b3c6260a3bfd52d2db3e70d1a079de108a61
• github.com/yahoo/serialize-javascript/pull/235
• github.com/yahoo/serialize-javascript/releases/tag/v7.1.3
• github.com/yahoo/serialize-javascript/security/advisories/GHSA-m5mm-p8h7-m29v