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CVE-2026-25156— HotCRP vulnerable to stored XSS via comment attachments

Quick assessment

Affected
kohler hotcrp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

HotCRP Conference Review Software是Eddie Kohler个人开发者的一个软件。用于管理评审过程，尤其是学术会议。 HotCRP Conference Review Software 2025年10月至2026年1月版本存在跨站脚本漏洞，该漏洞源于文档内联交付不当，可能导致跨站脚本攻击，进而允许恶意文档访问用户凭据并调用API。

CVSS 7.3 · High EPSS 0.23% · P13
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I. Basic Information for CVE-2026-25156

Vulnerability Information
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Vulnerability Title
HotCRP vulnerable to stored XSS via comment attachments
Source: CVE Program / CVE List V5
Vulnerability Description
HotCRP is conference review software. HotCRP versions from October 2025 through January 2026 delivered documents of all types with inline Content-Disposition, causing them to be rendered in the user’s browser rather than downloaded. (The intended behavior was for only `text/plain`, `application/pdf`, `image/gif`, `image/jpeg`, and `image/png` to be delivered inline, though adding `save=0` to the document URL could request inline delivery for any document.) This made users who clicked a document link vulnerable to cross-site scripting attacks. An uploaded HTML or SVG document would run in the viewer’s browser with access to their HotCRP credentials, and Javascript in that document could eventually make arbitrary calls to HotCRP’s API. Malicious documents could be uploaded to submission fields with “file upload” or “attachment” type, or as attachments to comments. PDF upload fields were not vulnerable. A search of documents uploaded to hotcrp.com found no evidence of exploitation. The vulnerability was introduced in commit aa20ef288828b04550950cf67c831af8a525f508 (11 October 2025), present in development versions and v3.2, and fixed in commit 8933e86c9f384b356dc4c6e9e2814dee1074b323 and v3.2.1. Additionally, c3d88a7e18d52119c65df31c2cc994edd2beccc5 and v3.2.1 remove support for `save=0`.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
HotCRP Conference Review Software 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
HotCRP Conference Review Software是Eddie Kohler个人开发者的一个软件。用于管理评审过程，尤其是学术会议。 HotCRP Conference Review Software 2025年10月至2026年1月版本存在跨站脚本漏洞，该漏洞源于文档内联交付不当，可能导致跨站脚本攻击，进而允许恶意文档访问用户凭据并调用API。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kohler hotcrp = 3.2 -

II. Public POCs for CVE-2026-25156

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III. Intelligence Information for CVE-2026-25156

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Patches & Fixes for CVE-2026-25156 (1)

IV. Related Vulnerabilities

Same product: hotcrp
Same vendor: kohler
Same weakness: CWE-79

V. Comments for CVE-2026-25156

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