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CVE-2026-28355— "PWA" Canarytoken Vulnerable to Stored Self Cross-Site Scripting

Quick assessment

Affected
thinkst canarytokens
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.

Canarytokens是Thinkst Applied Research开源的一个网络活动跟踪系统。 Canarytokens sha-7ff0e12之前版本存在跨站脚本漏洞，该漏洞源于PWA Canarytoken的标题字段处理不当，可能导致自跨站脚本攻击。

AI Predicted 3.5 Difficulty: Easy EPSS 0.45% · P37
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I. Basic Information for CVE-2026-28355

Vulnerability Information
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Vulnerability Title
"PWA" Canarytoken Vulnerable to Stored Self Cross-Site Scripting
Source: CVE Program / CVE List V5
Vulnerability Description
Canarytokens help track activity and actions on a network. Versions prior to `sha-7ff0e12` have a Self Cross-Site Scripting vulnerability in the "PWA" Canarytoken, whereby the Canarytoken's creator can attack themselves or someone they share the link with. The creator of a PWA Canarytoken can insert Javascript into the title field of their PWA token. When the creator later browses the installation page for their own Canarytoken, the Javascript executes. This is a self-XSS. An attacker could create a Canarytoken with this self-XSS, and send the install link to a victim. When they click on it, the Javascript would execute. However, no sensitive information (ex. session information) will be disclosed to the malicious actor. This issue is now patched on Canarytokens.org. Users of self-hosted Canarytokens installations can update by pulling the latest Docker image, or any Docker image after sha-7ff0e12.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U
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
Canarytokens 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canarytokens是Thinkst Applied Research开源的一个网络活动跟踪系统。 Canarytokens sha-7ff0e12之前版本存在跨站脚本漏洞，该漏洞源于PWA Canarytoken的标题字段处理不当，可能导致自跨站脚本攻击。
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
thinkst canarytokens < sha-7ff0e12 -

II. Public POCs for CVE-2026-28355

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III. Intelligence Information for CVE-2026-28355

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IV. Related Vulnerabilities

Same product: canarytokens
Same vendor: thinkst
Same weakness: CWE-79

V. Comments for CVE-2026-28355

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