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Sentry EUVDEUVD-2026-84552

| CVE-2026-83803 HIGH
Deserialization of Untrusted Data (CWE-502)
2026-09-22 GitHub_M
7.7
CVSS 4.0 · Vendor: GitHub_M
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Severity by source

Vendor (GitHub_M) PRIMARY
7.7 HIGH
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
7.5 HIGH

AC:H captures the non-default relocation-feature precondition (vendor's AT:P), PR:L for the required authenticated user, and full C/I/A:H for arbitrary code execution in the worker.

3.1 AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

5
POC Analysis Generated
Sep 22, 2026 - 19:27 vuln.today
Patch available
Sep 22, 2026 - 18:02 EUVD
Metadata Corrected
Sep 22, 2026 - 17:40 vuln.today
tag: Python added
Analysis Generated
Sep 22, 2026 - 17:08 vuln.today
CVE Published
Sep 22, 2026 - 16:24 cve.org
HIGH 7.7

DescriptionCVE.org

Sentry is an error tracking and performance monitoring tool. From 23.11.0 until 26.7.0, Sentry instances with the relocation feature enabled unsafely deserialize a legacy database field while importing a user-supplied relocation archive. An authenticated user can craft an archive that causes arbitrary code execution in the import worker process. Self-hosted installations using the default configuration are not affected because the relocation feature is disabled by default. This issue is fixed in version 26.7.0.

AnalysisAI

Authenticated code execution in Sentry's relocation import worker lets a user with a valid account on an affected instance run arbitrary code in the worker process by uploading a crafted relocation archive. Only instances that have explicitly enabled the relocation (backup import/export) feature are exposed, since that feature is disabled by default in self-hosted installations; affected versions run from 23.11.0 up to but not including 26.7.0, which contains the fix. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Vulnerability AssessmentAI

Exploitation Requires the Sentry relocation feature to be explicitly enabled - it is DISABLED BY DEFAULT, so self-hosted installations running the default configuration are not affected. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This is a genuine but conditionally-gated RCE. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Upgrade Sentry to 26.7.0 or later, which is the vendor-released fix and the version referenced by the release tag https://github.com/getsentry/sentry/releases/tag/26.7.0; the underlying change is in pull request https://github.com/getsentry/sentry/pull/119622 (commit d7fd44193c282102f9fcd2c73973820f3d10ac3a), full details in the advisory https://github.com/getsentry/sentry/security/advisories/GHSA-xm86-7c47-gjm4. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

Within 24 hours, inventory every self-hosted Sentry deployment and identify which are running versions 23.11.0 up to but not including 26.7.0 and have the relocation (backup import/export) feature flag enabled; where relocation is not an active business requirement, disable the feature immediately, since it is non-default and only enabled instances are exposed, and where it must stay on, restrict import capability to a small set of trusted administrators. …

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EUVD-2026-84552 vulnerability details – vuln.today

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