XSS in Vitessio Vitess
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.
Vulnerability class: XSS (Cross-Site Scripting)
Published .
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Vitessio Vitess — versions < 23.0.5, >= 24.0.0, < 24.0.2
Weakness classification (CWE)
References
- github.com/vitessio/vitess/security/advisories/GHSA-v75v-6fpf-gvw8
- github.com/vitessio/vitess/pull/20255
- github.com/vitessio/vitess/pull/20273
- github.com/vitessio/vitess/pull/20274
- github.com/vitessio/vitess/commit/3140c1846cd120db34f33b2083139b4ab638aed2
- github.com/vitessio/vitess/commit/976e1e0d78f9d29d02e5e31b4aa7e180648f08af
- github.com/vitessio/vitess/commit/c1ed96302e658190168c971afdac730cf70e43f7
- github.com/vitessio/vitess/releases/tag/v23.0.5
- github.com/vitessio/vitess/releases/tag/v24.0.2
Frequently asked questions
- What is CVE-2026-104252?
- CVE-2026-104252 is a critical-severity vulnerability in Vitessio Vitess, classified under Cross-site Scripting. CVSS score: 9.8/10. Published 2026-10-13.
- How severe is CVE-2026-104252?
- Critical severity. CVSS v3 base score is 9.8 out of 10.