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8 vulnerabilities found for by s9y

CVE-2026-73629 (GCVE-0-2026-73629)
Vulnerability from cvelistv5
Published
2026-08-13 11:28
Modified
2026-08-14 18:10
Severity ?
8.4 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N
8.5 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
CWE
  • CWE-918 - Server-Side Request Forgery (SSRF)
Summary
Serendipity before 2.6.0 contains a server-side request forgery vulnerability in the serendipity_url_allowed() filter that fails to block hex-encoded IPv4 addresses, IPv6 literals, and link-local ranges. Authenticated users with adminImagesAdd permission can bypass the filter using alternate address formats to request internal services and retrieve response bodies through the public uploads directory.
References
Impacted products
Vendor Product Version
s9y Serendipity Version: 0   ≤
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CVE-2026-73628 (GCVE-0-2026-73628)
Vulnerability from cvelistv5
Published
2026-08-13 11:28
Modified
2026-08-13 15:08
Severity ?
5.3 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
6.1 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
Serendipity versions >= 2.3.5 and <= 2.6.0 contain a reflected cross-site scripting vulnerability in the search clean-URL route (/search/<term>). In include/functions_routing.inc.php serveSearch(), the sanitisation pipeline runs urldecode() after HTML-encoding, so a single URL-encoded HTML payload survives strip_tags() and htmlspecialchars() and is then decoded back into live HTML in the page. A crafted search link can execute arbitrary JavaScript in the victim's browser. Fixed in 2.6.1.
References
Impacted products
Vendor Product Version
s9y Serendipity Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2026-67350 (GCVE-0-2026-67350)
Vulnerability from cvelistv5
Published
2026-07-31 14:19
Modified
2026-07-31 23:26
Severity ?
2.1 (Low) - CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
CWE
  • CWE-601 - URL Redirection to Untrusted Site ('Open Redirect')
Summary
Serendipity before 2.6.1 contains an open redirect vulnerability in exit.php that allows unauthenticated attackers to redirect users to arbitrary external sites by supplying a malicious Base64-encoded url parameter when the Track Exits plugin is configured with commentredirection set to s9y. Attackers can craft trusted-looking URLs leveraging the legitimate blog domain to conduct phishing, deliver malware, or bypass URL reputation filters.
References
Impacted products
Vendor Product Version
s9y Serendipity Version: 0   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2026-67351 (GCVE-0-2026-67351)
Vulnerability from cvelistv5
Published
2026-07-30 13:57
Modified
2026-07-31 22:52
Severity ?
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-304 - Missing Critical Step in Authentication
Summary
Serendipity before 2.6.1 contains an authentication context confusion vulnerability where password validation and session loading operate independently without ensuring both use the same user record. An authenticated Editor can create a username collision with an Administrator account and obtain administrative privileges by logging in with their own password while the session loads the Administrator's account data.
References
Impacted products
Vendor Product Version
s9y Serendipity Version: 0   ≤
Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2026-39971 (GCVE-0-2026-39971)
Vulnerability from cvelistv5
Published
2026-04-14 23:35
Modified
2026-04-15 16:22
Severity ?
7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
CWE
  • CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
Summary
Serendipity is a PHP-powered weblog engine. In versions 2.6-beta2 and below, the email sending functionality in include/functions.inc.php inserts $_SERVER['HTTP_HOST'] directly into the Message-ID SMTP header without validation, and the existing sanitization function serendipity_isResponseClean() is not called on HTTP_HOST before embedding it. An attacker who can control the Host header during an email-triggering action such as comment notifications or subscription emails can inject arbitrary SMTP headers into outgoing emails. This enables identity spoofing, reply hijacking via manipulated Message-ID threading, and email reputation abuse through the attacker's domain being embedded in legitimate mail headers. This issue has been fixed in version 2.6.0.
References
Impacted products
Vendor Product Version
s9y Serendipity Version: < 2.6.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2026-39963 (GCVE-0-2026-39963)
Vulnerability from cvelistv5
Published
2026-04-14 23:31
Modified
2026-04-15 13:23
Severity ?
6.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:L/A:N
CWE
  • CWE-565 - Reliance on Cookies without Validation and Integrity Checking
Summary
Serendipity is a PHP-powered weblog engine. In versions 2.6-beta2 and below, the serendipity_setCookie() function in include/functions_config.inc.php uses $_SERVER['HTTP_HOST'] without validation as the domain parameter of setcookie(). An attacker who can influence the Host header at login time, such as via MITM, reverse proxy misconfiguration, or load balancer manipulation, can force authentication cookies including session tokens and auto-login tokens to be scoped to an attacker-controlled domain. This enables session fixation, token leakage to attacker-controlled infrastructure, and privilege escalation if an admin logs in under a poisoned Host header. This issue has been fixed in version 2.6.0.
References
Impacted products
Vendor Product Version
s9y Serendipity Version: < 2.6.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2023-53933 (GCVE-0-2023-53933)
Vulnerability from cvelistv5
Published
2025-12-17 22:44
Modified
2026-04-07 14:07
Severity ?
8.7 (High) - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-434 - Unrestricted Upload of File with Dangerous Type
Summary
Serendipity 2.4.0 contains a remote code execution vulnerability that allows authenticated attackers to upload malicious PHP files with .phar extension. Attackers can upload files with system command payloads to the media upload endpoint and execute arbitrary commands on the server.
References
Impacted products
Vendor Product Version
s9y Serendipity Version: 2.4.0
 Create a notification for this product.
Show details on NVD website

To clipboard 

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CVE-2023-53932 (GCVE-0-2023-53932)
Vulnerability from cvelistv5
Published
2025-12-17 22:44
Modified
2026-04-07 14:07
Severity ?
5.1 (Medium) - 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
5.4 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CWE
  • CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Summary
Serendipity 2.4.0 contains a stored cross-site scripting vulnerability that allows authenticated users to inject malicious scripts through blog entry creation. Attackers can craft entries with JavaScript payloads that will execute when other users view the compromised blog post.
References
Impacted products
Vendor Product Version
s9y Serendipity Version: 2.4.0
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