CVE-2023-51451

SSRF in symbolicator via invalid protocol

MEDIUM
4.3
CVSS Score
Published: December 22, 2023 at 09:01 PM UTC
Updated: June 17, 2026 at 06:40 AM UTC
2 products affected across 2 vendorsSymbolicatorSymbolicator

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Severity
MEDIUM4.3
Exploit prediction
EPSS 0.5%

Description

Symbolicator is a service used in Sentry. Starting in Symbolicator version 0.3.3 and prior to version 21.12.1, an attacker could make Symbolicator send GET HTTP requests to arbitrary URLs with internal IP addresses by using an invalid protocol. The responses of those requests could be exposed via Symbolicator's API. In affected Sentry instances, the data could be exposed through the Sentry API and user interface if the attacker has a registered account. The issue has been fixed in Symbolicator release 23.12.1, Sentry self-hosted release 23.12.1, and has already been mitigated on sentry.io on December 18, 2023. If updating is not possible, some other mitigations are available. One may disable JS processing by toggling the option `Allow JavaScript Source Fetching` in `Organization Settings > Security & Privacy` and/or disable all untrusted public repositories under `Project Settings > Debug Files`. Alternatively, if JavaScript and native symbolication are not required, disable Symbolicator completely in `config.yml`.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

0.3.3 ≤ v < 23.12.1
Affected range stops below 23.12.1, so it looks safe — our inference, not a vendor statement
v < 23.12.1
Affected range stops below 23.12.1, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

CVSS

4.3MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-918

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