GHSA-c6c4-7x48-4cqp: com.vaadin:vaadin-bom

Timing side channel vulnerability in UIDL request handler in Vaadin 10, 11-14, and 15-18

CVSS 4.0 Medium

Published by the GitHub Advisory Database at 19 Apr 2021, 14:47 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

Package	Ecosystem	Affected	Fixed in
com.vaadin:vaadin-bom	Maven	>=10.0.0, <10.0.17 \|\| >=11.0.0, <14.4.7 \|\| >=15.0.0, <18.0.6	10.0.17, 14.4.7, 18.0.6

Identifiers

GHSA-c6c4-7x48-4cqp

Weakness (CWE)

CWE-208

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Vaadin (com.vaadin:vaadin-bom) versions 10.0.0 before 10.0.17, 11 through 14.4.6, and 15 through 18.0.5 are affected. The UIDL request handler compares CSRF tokens in a non-constant-time manner, so an attacker who can send requests and measure response timing may be able to guess a security token. Upgrade to 10.0.17, 14.4.7, or 18.0.6, depending on your release line.

Written 8 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
4.0	Medium	3.1	CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N	GitHub Advisory Database

CISA KEV Not listed.
EPSS No score.

Timeline

31 Oct 2026, 15:12 UTC First seen by agentprime
31 Oct 2026, 15:12 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.