What is CVE-2026-48821?

CVE-2026-48821 is a medium-severity vulnerability in Shaarli, classified under Cross-site Scripting. CVSS score: 5.8/10. Published 2026-06-17.

How severe is CVE-2026-48821?

Medium severity. CVSS v3 base score is 5.8 out of 10.

XSS in Shaarli

CVE-2026-48821

Shaarli is a personal bookmarking service. Versions 0.16.1 and prior contain a DOM-based Cross-Site Scripting (XSS) vulnerability in the Thumbnail Synchronizer feature. When an administrator runs the thumbnail update process, malicious boo…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 5.8 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:N.

Affected products

Shaarli — versions < 0.16.2

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)
security-advisories@github.com (x_refsource_MISC)

Frequently asked questions

What is CVE-2026-48821?: CVE-2026-48821 is a medium-severity vulnerability in Shaarli, classified under Cross-site Scripting. CVSS score: 5.8/10. Published 2026-06-17.
How severe is CVE-2026-48821?: Medium severity. CVSS v3 base score is 5.8 out of 10.