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    2 vulnerabilities by isso-comments

    CVE-2026-27469 (GCVE-0-2026-27469)

    Vulnerability from nvd – Published: 2026-02-21 07:24 – Updated: 2026-02-24 18:50
    VLAI
    Title
    Isso: Stored XSS via comment website field
    Summary
    Isso is a lightweight commenting server written in Python and JavaScript. In commits before 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144, there is a stored Cross-Site Scripting (XSS) vulnerability affecting the website and author comment fields. The website field was HTML-escaped using quote=False, which left single and double quotes unescaped. Since the frontend inserts the website value directly into a single-quoted href attribute via string concatenation, a single quote in the URL breaks out of the attribute context, allowing injection of arbitrary event handlers (e.g. onmouseover, onclick). The same escaping is missing entirely from the user-facing comment edit endpoint (PUT /id/) and the moderation edit endpoint (POST /id//edit/). This issue has been patched in commit 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144. To workaround, nabling comment moderation (moderation = enabled = true in isso.cfg) prevents unauthenticated users from publishing comments, raising the bar for exploitation, but it does not fully mitigate the issue since a moderator activating a malicious comment would still expose visitors.
    Severity
    6.1 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    • CWE-116 - Improper Encoding or Escaping of Output
    Assigner
    References
    Impacted products
    Vendor Product Version
    isso-comments isso Affected: < 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-27469 (GCVE-0-2026-27469)

    Vulnerability from cvelistv5 – Published: 2026-02-21 07:24 – Updated: 2026-02-24 18:50
    VLAI
    Title
    Isso: Stored XSS via comment website field
    Summary
    Isso is a lightweight commenting server written in Python and JavaScript. In commits before 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144, there is a stored Cross-Site Scripting (XSS) vulnerability affecting the website and author comment fields. The website field was HTML-escaped using quote=False, which left single and double quotes unescaped. Since the frontend inserts the website value directly into a single-quoted href attribute via string concatenation, a single quote in the URL breaks out of the attribute context, allowing injection of arbitrary event handlers (e.g. onmouseover, onclick). The same escaping is missing entirely from the user-facing comment edit endpoint (PUT /id/) and the moderation edit endpoint (POST /id//edit/). This issue has been patched in commit 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144. To workaround, nabling comment moderation (moderation = enabled = true in isso.cfg) prevents unauthenticated users from publishing comments, raising the bar for exploitation, but it does not fully mitigate the issue since a moderator activating a malicious comment would still expose visitors.
    Severity
    6.1 (Medium)
    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
    • CWE-116 - Improper Encoding or Escaping of Output
    Assigner
    References
    Impacted products
    Vendor Product Version
    isso-comments isso Affected: < 0afbfe0691ee237963e8fb0b2ee01c9e55ca2144
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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