Critical 9.8Published Oct 13, 2026

CVE-2026-104252Vitess vttablet /twopcz reflected XSS

Updated under an hour ago (Oct 27, 2026, 11:00 AM ET)

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It affects vitessio vitess and 1 other product. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 1.17%, higher than 67% of scored CVEs.

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Every CVE for vitessio vitess

Exploited in the last 30 days

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.

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 1.17% (percentile 67)
Assigned by: GitHub_M
NVD analysis: Analyzed
Record last updated: Oct 15, 2026
First seen by InfoSec Signals: Oct 13, 2026

Affected products

Affected products

vitessio vitess vitessio:vitess (from the name)	before 23.0.5; from 24.0.0, < 24.0.2	CNA record
linuxfoundation vitess linuxfoundation:vitess	before 23.0.5; from 24.0.0 before 24.0.2	NVD

References

References

https://github.com/vitessio/vitess/security/advisories/GHSA-v75v-6fpf-gvw8	x-refsource-confirm, vendor-advisory, exploit, mitigation
https://github.com/vitessio/vitess/pull/20255	x-refsource-misc, issue-tracking, patch
https://github.com/vitessio/vitess/pull/20273	x-refsource-misc, issue-tracking, patch
https://github.com/vitessio/vitess/pull/20274	x-refsource-misc, issue-tracking, patch
https://github.com/vitessio/vitess/commit/3140c1846cd120db34f33b2083139b4ab638aed2	x-refsource-misc, patch
https://github.com/vitessio/vitess/commit/976e1e0d78f9d29d02e5e31b4aa7e180648f08af	x-refsource-misc, patch
https://github.com/vitessio/vitess/commit/c1ed96302e658190168c971afdac730cf70e43f7	x-refsource-misc, patch
https://github.com/vitessio/vitess/releases/tag/v23.0.5	x-refsource-misc, release-notes
https://github.com/vitessio/vitess/releases/tag/v24.0.2	x-refsource-misc, release-notes

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.