paicoding 1.0.0 through 1.0.3 Stored XSS via JSON-LD Profile Description

Advisories

paicoding 1.0.0 through 1.0.3 Stored XSS via JSON-LD Profile Description

Severity: medium
Date: 11/13/2026
Affecting: paicoding >= 1.0.0, <= 1.0.3
CVE: CVE-2026-129141
CWE: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVSS: 5.1
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
References: https://vul.yulun.ac.cn/20261112/paicoding/
https://github.com/itwanger/paicoding/issues/137
https://github.com/itwanger/paicoding/blob/903adce70309d340f7eec51ec3c80cfe3c8326c1/paicoding-ui/src/main/resources/templates/components/layout/header.html#L59
https://github.com/itwanger/paicoding/blob/903adce70309d340f7eec51ec3c80cfe3c8326c1/paicoding-web/src/main/java/com/github/paicoding/forum/web/global/SeoInjectService.java#L386-L387
Credit: Wu Yulun
Description: paicoding 1.0.0 through 1.0.3 contains a stored cross-site scripting vulnerability because SeoInjectService embeds user profile text without escaping in an inline JSON-LD script element. Authenticated attackers can add a closing script tag followed by HTML to their profile, executing scripts for visitors of their profile page and stealing the non-HttpOnly f-session cookie.

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