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CVE-2026-104252

CRITICAL 9.8

Published 2026-10-13 · Last modified 2026-10-15

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.

ELEVATED IMPACT

Severe if exploited (CVSS 9.8), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

1.2%chance of exploitation in 30 days · 67th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

9.8CVSS 3.1 · CRITICAL

  • ConfidentialityHigh
  • IntegrityHigh
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

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Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Vitessio Linuxfoundation

Products Vitess

Weakness (CWE)

  • CWE-79: : Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References and research data (JSON)

Packages and version ranges

Each advisory describes its own package and affected ranges. A boundary applies to that range; it is not a universal upgrade recommendation.

  • vitess.io/vitess Go

    pkg:golang/vitess.io/vitess

    SEMVER range
    • All earlier versions (introduced 0)
    • Fixed boundary (excluded): 0.23.5
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-v75v-6fpf-gvw8/GHSA-v75v-6fpf-gvw8.json"
  }
}
    GitHub Advisory Database · GHSA-v75v-6fpf-gvw8 · Updated 2026-10-15T20:30:05.447638204Z
  • vitess.io/vitess Go

    pkg:golang/vitess.io/vitess

    SEMVER range
    • Introduced version (included): 0.24.0
    • Fixed boundary (excluded): 0.24.2
    Additional upstream package constraints
    {
  "database": {
    "source": "https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/10/GHSA-v75v-6fpf-gvw8/GHSA-v75v-6fpf-gvw8.json"
  }
}
    GitHub Advisory Database · GHSA-v75v-6fpf-gvw8 · Updated 2026-10-15T20:30:05.447638204Z

Known Affected Software Configurations

VendorProductVersion range
LinuxfoundationVitess< 23.0.5
LinuxfoundationVitess≥ 24.0.0 and < 24.0.2

All CVSS metrics

  • CRITICAL 9.8 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  • CRITICAL 9.8 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Exploit-tagged references (not proof of a PoC)

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS