Vulnerability · Published Sep 4, 2026 · Assigned by GitHub_M

CVE-2026-53758Emlog: Stored XSS via Parsedown Markdown Processing - Raw HTML Not Sanitized

High 8.7

In plain English

A high-severity cross-site scripting in emlog from emlog. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities).

Severity (CVSS 4.0)8.7High

Exploit odds (30 days)0.4%top 61.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
emlog	emlog	<= 2.6.29

Weakness: CWE-79 · Vector: 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

References

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