paicoding 1.0.0 through 1.0.3 Stored XSS via SVG Image Upload

Advisories

paicoding 1.0.0 through 1.0.3 Stored XSS via SVG Image Upload

Severity: medium
Date: 11/13/2026
Affecting: paicoding >= 1.0.0, <= 1.0.3
CVE: CVE-2026-129140
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-service/src/main/java/com/github/paicoding/forum/service/image/service/ImageServiceImpl.java#L174-L180
Credit: Wu Yulun
Description: paicoding 1.0.0 through 1.0.3 contains a stored cross-site scripting vulnerability in image upload because ImageServiceImpl.validateStaticImg accepts SVG files, which are then served from the site origin when local storage is used. Authenticated attackers can upload script-bearing SVG images that execute when victims view them, stealing the non-HttpOnly f-session cookie to hijack accounts.

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