Vulnerability · Published Oct 13, 2026 · Assigned by VulnCheck

CVE-2026-110225Shaarli through 0.16.9 SSRF via Thumbnail Retrieval update-thumbnail Route

Low 2.7

In plain English

A low-severity server-side request forgery in Shaarli from shaarli. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 28% of all known vulnerabilities).

Severity (CVSS 3.1)2.7Low

Exploit odds (30 days)0.3%top 72.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Shaarli through 0.16.9 contains a server-side request forgery vulnerability that allows authenticated users to make the server request internal addresses by fetching bookmark thumbnails without private-address checks. Attackers can create bookmarks pointing to loopback, private, or cloud metadata addresses and trigger ThumbnailsController::ajaxUpdate or saving to send blind GET requests, with open_shaarli exposing this to any visitor.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:12	shaarli	no fix listed	DEBIAN-CVE-2026-110225
Debian:13	shaarli	no fix listed	DEBIAN-CVE-2026-110225

Affected products (as reported)

Vendor	Product	Versions
shaarli	Shaarli	0 – through 0.16.9

Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N

References

https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/shaarli-open-mode-thumbnail-fetch-ssrf third-party-advisory
https://github.com/shaarli/Shaarli/blob/bfeadb4e5856702c05279bb2a5c405f2ed802015/application/front/controller/admin/ThumbnailsController.php#L46-L64 technical-description
https://github.com/shaarli/Shaarli/blob/bfeadb4e5856702c05279bb2a5c405f2ed802015/application/Thumbnailer.php#L82-L98 technical-description
https://github.com/shaarli/Shaarli product
VulnCheck Advisory: Shaarli through 0.16.9 SSRF via Thumbnail Retrieval update-thumbnail Route third-party-advisory