CVE-2026-104252

Vitess is a database clustering system for horizontal scaling of MySQL. Prior to 23.0.5 and 24.0.2, twopczHandler in go/vt/vttablet/tabletserver/twopcz.go writes the Action and dtid form values from the vttablet and vtcombo /twopcz HTTP debug endpoint into a text/html response without HTML escaping. Under the default allow-all ACL policy, a remote unauthenticated attacker can send an operator a crafted request that executes script in the operator's browser after the request is opened. The script runs with the vttablet debug origin and can read same-origin diagnostic endpoints that expose query, transaction, environment, variable, or profiling data available in that deployment. This issue is fixed in versions 23.0.5 and 24.0.2.

• CWE-79

• https://github.com/vitessio/vitess/commit/3140c1846cd120db34f33b2083139b4ab638aed2
• https://github.com/vitessio/vitess/commit/976e1e0d78f9d29d02e5e31b4aa7e180648f08af
• https://github.com/vitessio/vitess/commit/c1ed96302e658190168c971afdac730cf70e43f7
• https://github.com/vitessio/vitess/pull/20255
• https://github.com/vitessio/vitess/pull/20273
• https://github.com/vitessio/vitess/pull/20274
• https://github.com/vitessio/vitess/releases/tag/v23.0.5
• https://github.com/vitessio/vitess/releases/tag/v24.0.2
• https://github.com/vitessio/vitess/security/advisories/GHSA-v75v-6fpf-gvw8

Published

Oct 13, 2026

Last Modified

Oct 13, 2026

Status

Received

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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