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Vulnerability record · CVE-2026-53758 · published 4 September 2026

CVE-2026-53758: Cross-site scripting vulnerability

Emlog is an open source website building system. In versions 2.6.29 and prior, article content is processed by Parsedown without enabling safe mode, which means raw HTML including <script> tags embedded in Markdown is passed through unescaped. The output is rendered with no additional sanitization, resulting in stored XSS visible to all site visitors. At time of publication, there are no publicly known patches.

8.7 CVSS 4.0 High EPSS 0.44% · top 64.5% CWE-79 · Cross-site scripting Deferred
8.7CVSS 4.0 base score
0.44%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
2References
9 Sep 2026Last modified by NVD

Description

Emlog is an open source website building system. In versions 2.6.29 and prior, article content is processed by Parsedown without enabling safe mode, which means raw HTML including <script> tags embedded in Markdown is passed through unescaped. The output is rendered with no additional sanitization, resulting in stored XSS visible to all site visitors. At time of publication, there are no publicly known patches.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

References

LinkTags
https://github.com/emlog/emlog/security/advisories/GHSA-35vc-2gv4-mw77
https://github.com/emlog/emlog/security/advisories/GHSA-35vc-2gv4-mw77

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Source: NIST National Vulnerability Database (record CVE-2026-53758), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.