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TI-2023-30216 Aliases CVE-2023-53933GHSA-87vx-4xf9-32hg

Serendipity 2.4.0 Authenticated Remote Code Execution via File Upload

Priority HIGH 73CWE-434Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-434.

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.01017 63rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by the CNA and NVD
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
s9ySerendipity2.4.0—No fix listedCNA
  • Serendipity Vendors9y Affected 2.4.0 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:s9y:serendipity:2.4.0:-:*:*:*:*:*:*2.4.0Vulnerables9y
  • cpe:2.3:a:s9y:serendipity:2.4.0:-:*:*:*:*:*:* Versions 2.4.0 Vulnerable ·s9y

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-53933
  2. 2026-10-03 Alias added: GHSA-87vx-4xf9-32hg

References

Exploit 1

Other 1

  • TI-2024-38379 Serendipity 2.5.0 Remote Code Execution via Authenticated Media Upload CVSS 4.0HIGH 8.6
  • TI-2026-28827 Serendipity: Host Header Injection leads to SMTP header injection via unvalidated HTTP_HOST CVSS 3.1HIGH 7.2
  • TI-2026-28819 Serendipity: Host Header Injection enables authentication cookie scoping to an attacker-controlled domain CVSS 3.1MEDIUM 6.9
  • TI-2023-30215 Serendipity 2.4.0 Stored Cross-Site Scripting via Admin Entry Creation CVSS 4.0MEDIUM 5.1
  • TI-2011-00987 Cross-Site Scripting (XSS) in Xinha, as included in the Serendipity package before 1.5.5… CVSS 3.1CRITICAL 9.8
  • TI-2020-08841 Serendipity before 2.3.4 on Windows allows remote attackers to execute arbitrary code… CVSS 3.1CRITICAL 9.8
See all 57 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences