CVE-2026-104252: Cross-Site Scripting Flaw in vitessio vitess Scores 9.8 on CVSS
A newly published critical vulnerability in vitessio vitess carries a CVSS score of 9.8. Here is what is affected and how to respond.
Key points
- CVE-2026-104252 affects vitessio vitess.
- CVSS 9.8 (Critical).
- No exploitation confirmed yet.
vitessio vitess is affected by CVE-2026-104252, a cross-site scripting that the National Vulnerability Database rates 9.8 out of 10.
At a glance
- CVE
- CVE-2026-104252
- Product
- vitessio vitess
- CVSS
- 9.8 Critical
- Weakness
- cross-site scripting
- Exploited
- No known exploitation
What is the vulnerability?
The NVD entry states: 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.
Affected versions
| Vendor | Product | Versions |
|---|---|---|
| Vitessio | vitess | < 23.0.5, >= 24.0.0, < 24.0.2 |
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Is it being exploited?
There is no public confirmation of exploitation at the time of publication. It does not appear in CISA's Known Exploited Vulnerabilities catalog. We will update this report if that changes.
What should you do?
- Identify whether the affected product and versions run in your environment.
- Apply the vendor update listed in the advisory as soon as it is available.
- Limit network exposure of the affected service until it is patched.
- Monitor the vendor advisory for updated guidance or exploitation reports.
What to do and how to stay safe: CVE-2026-104252
- Vulnerability severity scores ignore your specific architecture and context.
- Exploitability depends on network exposure and user behavior, not just code flaws.
- Prioritization requires continuous asset inventory and threat intelligence alignment.
Risk-based vulnerability management focuses your limited resources on the flaws that actually threaten your business. Start by mapping your critical assets and checking for active exploits to prioritize your backlog.
Step-by-step guide: Risk-Based Vulnerability Management: Prioritize Fixes by Actual Danger
General security guidance from the Threat Times newsroom. It is not confirmed advice from the organisations named in this story.
Frequently asked questions
What is CVE-2026-104252?
CVE-2026-104252 is a cross-site scripting vulnerability in vitessio vitess.
How severe is CVE-2026-104252?
It has a CVSS score of 9.8 Critical.
Is CVE-2026-104252 being exploited?
There is no public confirmation of exploitation at the time of publication.
